Eliwell Ewcm 900 S -

Managing a machine room requires a delicate balance of precision and reliability. The Eliwell EWCM 900/S

has long been a staple for technicians looking to manage multi-compressor racks and condenser fans efficiently. Whether you are performing a retrofit or maintaining an existing system, understanding this controller’s capabilities is key to system longevity. What is the Eliwell EWCM 900/S ? EWCM 900/S

is a dedicated controller designed specifically for refrigeration machine rooms. It acts as the "brain" of the compressor rack, managing:

Compressors: Single units, multi-stage systems, or compressors with varying capacities.

Condenser Fans: Integrated management to maintain head pressure. 💡 Pro-Tip: The EWCM 900/S

uses 11 configurable relay outputs to manage these resources effectively. Key Technical Specifications

Understanding the hardware is the first step toward a successful installation.

Inputs: Supports NTC temperature probes or 4…20 mA pressure transducers for both suction and condensing.

Mounting: Designed for flush panel mounting (cutout 67x137 mm).

Power Supply: Typically 230V AC, with some 24V versions available upon request.

Refrigerant Compatibility: Pre-programmed for common types like R22, R134A, R404A, R407, R502, and R507.

Connectivity: Features an RS-485 port for integration with the Eliwell Televis system. Top Features for Reliability The "S" in the EWCM 900/S

often refers to its specialized management of safety and efficiency:

Dual Setpoints: Easily toggle between "Normal" and "Economy" modes to save energy during low-demand periods.

Integrated Diagnosis: The controller performs continuous self-checks. If a malfunction is detected, a dedicated breakdown output can transfer control to an emergency system.

Flexible Units: View data in Bar/PSI or °C/°F depending on your preference.

Alarm Management: Includes 11 optoisolated digital inputs for tracking individual compressor alarms. Installation & Troubleshooting Tips When setting up or replacing an EWCM 900/S , keep these pointers in mind:

Sensor Polarity: Ensure your NTC or pressure sensors are wired correctly to avoid "Probe Failure" alarms.

Access Control: The unit uses password protection (parameter Pso) to prevent unauthorized changes to configuration.

Legacy Support: If you are looking for parts, retailers like Classic Automation or HOS BV often stock refurbished or new-old-stock units.

Заморочка с контроллером Eliwell Ewcm 900 /s

The Eliwell EWCM 900/S Go to product viewer dialog for this item.

is a specialized electronic controller designed for the comprehensive management of machine rooms within refrigeration systems. It primarily serves as a centralized hub for controlling compressors and condenser fans, ensuring efficient operation and system protection. Core Functionality and Design EWCM 900/S

is engineered to handle various compressor configurations, including single units, multi-stage systems, and units with different capacities or stepped powers. Its versatility allows it to manage homogeneous reciprocating units as well as more complex, non-homogeneous setups.

Output Capabilities: The device features 11 relay outputs that are fully configurable to control different system resources like fans and compressors.

Sensor Inputs: It supports inputs for pressure or temperature sensors, typically using NTC probes or 4…20 mA pressure transducers for both suction and head pressure monitoring.

Physical Build: It is housed in a black ABS plastic casing designed for flush panel mounting, with dimensions of approximately 72x144 mm and a depth of 120 mm. Advanced Features Beyond basic control, the EWCM 900/S

integrates several advanced features to enhance system reliability and performance:

Alarm Management: Each compressor is linked to a dedicated alarm circuit, and the controller provides high/low pressure protection.

Energy Optimization: It includes a clock for setting different operation setpoints during various time periods, such as "Normal" or "Economy" modes to reduce energy consumption. eliwell ewcm 900 s

Refrigerant Compatibility: The unit comes pre-loaded with conversion charts for common refrigerants like R22, R134A, R404A, R407, and R507.

Diagnostics: A continuous self-diagnosis system monitors the controller's health. In case of failure, a dedicated breakdown relay can transfer control to an emergency system. Programming and Interface

The controller uses a dual-level programming interface: an Operating ("oPr") menu for daily adjustments and a Configuration ("CnF") menu for deep system setup. Users can navigate these via the front keypad, which includes a double 3-digit display to show real-time data like compressor status and run times. For integration into broader monitoring networks, it features an RS-485 serial port for connection to the Eliwell Televis system. EWCM 900/S rel. 5/2000 ing compressors and fans manager

Eliwell EWCM 900/S is a specialized controller designed for managing compressor racks and condenser fans in industrial refrigeration machine rooms. It is known for its versatility in handling various compressor configurations—from single-unit setups to multi-stage systems and compressors with varying capacities. Eliwell France 🛠️ Key Technical Specifications

: 11 configurable relay outputs (6A 250V AC) for compressors and fans. Suction & Discharge

: Programmable for 4–20 mA pressure transducers or NTC temperature probes.

: 11 optoisolated digital alarm inputs that match the supply voltage. Pressurestats : Dedicated inputs for high and low pressurestat alarms.

: Flush panel mount, 72x144 mm dimensions, with a double 3.5-digit display. Connectivity : Native RS-485 port for integration with the Eliwell Televis supervision system. Refrigerant Support : Compatible with R22, R134A, R502, R404A, R407, and R507. Eliwell France 🌟 Top Features & Functionality Adaptive Control

: Manages "homogeneous" compressors (same power) via rotation to balance wear, or "heterogeneous" setups based on specific capacity needs. Dual Operating Modes

: Supports "Normal" and "Economy" setpoints to optimize energy consumption during off-peak hours. Fail-Safe Redundancy : Includes a Safety Relay

that activates if the controller hardware fails, handing control to a basic emergency backup system. User Interface

: Real-time display of suction and condensing values, status LEDs for fans, and an alarm light for immediate diagnostic feedback. Eliwell France ⚖️ Performance Review High Flexibility

: The ability to mix compressor types and sizes within the same rack is a major advantage for custom-built systems. Comprehensive Diagnostics

: 11 dedicated alarm inputs allow for precise pinpointing of which component in a large rack has failed. Ease of Monitoring

: Direct Bar/PSI or °C/°F conversion on the display simplifies maintenance without needing external conversion charts. Eliwell France Sensor Sensitivity

: Some users have reported issues with NTC probe recognition, sometimes requiring specific PTC alternatives depending on the firmware version. Legacy Design

: While reliable, the 900/S is part of an older series. Modern "9000 PRO" models offer more advanced inverter-specific algorithms and CO2 transcritical support. Диалог специалистов АВОК 🏗️ Typical Applications Eliwell EWCM 900/S

is its ability to handle complex configurations. It can simultaneously manage: Compressors

: Supports single units, multi-stage systems, or compressors with varying capacities. Condenser Fans

: Integrated management of fan sections to optimize high-pressure control. Relay Flexibility : Equipped with 11 relay outputs that can be configured for single or multistep units. Ease of Use & Flexibility

The interface is designed for practical, real-world operation: Universal Measurements

: Values can be displayed in Bar/PSI, °C, or °F, making it adaptable for global technicians. Quick Monitoring

: The front panel features dedicated buttons to check compressor run times ("HRS") and status, which is essential for preventive maintenance. Dual Setpoints

: It allows for easy switching between "normal" and "economy" setpoints to help reduce energy costs during low-demand periods. Robust Safety Features Safety is a priority with the EWCM 900/S . It includes: Continuous Diagnosis

: A built-in protection system monitors the hardware constantly. Emergency Handover

: In the event of a controller failure, a dedicated output can transfer control to an emergency system, ensuring the plant continues to operate at a minimum level until help arrives. Pressure Management

: Includes alarms for high and low pressure/pressurestat conditions for both compressors and fans. Connectivity The unit features an RS-485 serial port , enabling seamless integration with the Televis system for remote monitoring and data acquisition. Eliwell EWCM 900/S

is a "workhorse" controller that balances complex logic with user-friendly operation. It is an excellent choice for anyone needing reliable, granular control over a machine room's refrigeration rack. with newer models like the EWCM 9000 PRO for CO2 applications? EWCM 900/S rel. 5/2000 ing compressors and fans manager

The Eliwell EWCM 900/S Go to product viewer dialog for this item.

is a specialized electronic controller designed for managing compressor and fan sections in industrial refrigeration machine rooms. It supports complex configurations, including homogeneous and non-homogeneous reciprocating compressor units with multiple power stages. Technical Specifications

Physical Dimensions: 72x144 mm (front panel), with a 120 mm depth. Mounting: Flush panel mount requiring a 67x137 mm cutout.

Power Supply: Typically 230V AC (50/60 Hz), with some 24V variants available upon request. Inputs:

Sensors: Two 4–20 mA pressure transducers or NTC temperature probes for suction and condensing.

Digital: 11 optoisolated alarm inputs corresponding to the supply voltage.

Outputs: 11 configurable relay outputs (6(3)A 250V AC) for compressors and fans.

Communication: Integrated RS-485 port for connection to the Televis System.

Supported Refrigerants: R22, R134A, R502, R404A, R407, and R507. Core Features & Functionality

Dual Management: Controls both the compression and condensation phases by managing compressors and condenser fans simultaneously.

Advanced Control: Features dedicated algorithms for energy saving and inverter-control management. Eliwell EWCM 900/S a specialized series of controllers

Alarm System: Includes global alarm and safety relay outputs, plus specialized high/low pressurestat alarm management for both compressor and fan sections.

User Interface: Dual display (4-digit for suction, 3-digit for condensing) showing probe values and alarm codes.

Programming: Two levels of access—Operating ("oPr") and Configuration ("CnF")—secured by passwords. Market Availability & Pricing

This model is often available as a refurbished or used component for legacy system maintenance.

Classic Automation: Offers refurbished units in stock for approximately $790.00.

eBay (tech-automation): Lists used units for approximately $389.00 $369.55.

HOS BV: Provides used and new units with optional testing and refurbishing services. New Eliwell EWCM 900/S - HOS BV

Description for Eliwell EWCM 900/S New Eliwell EWCM 900/S controller. Power supply 50/60 Hz: 220 Vac. Alarm inputs: 220 Vac. Used Eliwell EWCM 900/S - HOS BV

* search. Select or advice. * Transparent estimate. * Test / Refurbish. * Test reporting. * Logistics and transport. EWCM 900/S rel. 5/2000 ing compressors and fans manager

The Eliwell EWCM 900/S is a professional-grade controller designed for managing refrigeration machine rooms, specifically for compressor racks and condenser fans. Key Control Features

Dual Section Management: Simultaneously controls suction (compressors) and discharge (condenser fans) sections.

Versatile Compressor Support: Manages single-stage, multi-stage, or different-capacity compressors.

Smart Rotation: Includes algorithms for "homogenous" compressor rotation (equalizing wear on units with same power).

Setpoints: Offers dual "Normal" and "Economy" (reduced) setpoints for energy efficiency.

Pressure & Temperature Monitoring: Inputs can be configured for NTC temperature probes or 4…20 mA pressure transducers. Hardware & Connectivity

11 Relay Outputs: Fully configurable for managing compressor stages and fans.

11 Alarm Inputs: Optoisolated digital inputs for monitoring individual compressor/fan safety.

Serial Port: RS-485 connection for integration into the Televis monitoring system.

Housing: Standard 72x144 mm flush panel mount with a depth of 120 mm.

Power Supply: Typically 230V AC (with 24V options available). Safety & Diagnostic Functions 🚨 Eliwell EWCM 900/S

The query "eliwell ewcm 900 s" — make piece appears to be a fragmented or non-standard request.

Based on technical knowledge:

• Eliwell is a brand (now part of Schneider Electric) that makes electronic controllers for HVAC/R applications.
• EWCM 900 S is likely a specific model of controller, possibly for refrigeration or air handling units (e.g., a parametric controller with a 96x96 mm face, multi-input/output).
• — make piece could be a translation artifact or shorthand — possibly meaning:
  • “Make piece” as in “find/make a spare part” (e.g., replacement unit, power board, display), or
  • A mistranslation of “make peace” (unlikely here), or
  • A request to recreate or “piece together” its datasheet, wiring, or settings.

Since you didn’t ask a clear question, I can offer the most likely useful interpretation:

If you need documentation / wiring / parameters for the EWCM 900 S, here is the standard approach:

1. Go to the official Eliwell support site (now under Schneider Electric’s “Eliwell” archives).
2. Search for “EWCM 900 S user manual” or “installation guide.”
3. The manual typically includes:
   • Physical dimensions and mounting
   • Wiring diagram
   • Parameter list (accessible via front keypad)
   • Input/output configurations (e.g., NTC/PTC/0-10V/4-20mA)
   • Relay ratings

If you mean you need a replacement part (e.g., “make piece” = make a replacement piece):

• The entire controller is usually replaced as a unit — internal boards are not sold separately.
• Model: EWCM 900 S (likely discontinued but check for equivalent current models).

To give you an exact answer, please clarify:

• Do you need the user manual?
• Do you need wiring details?
• Do you need a replacement unit?
• Is “make piece” a translation of a phrase in another language?

Title: Eliwell EWCM 900 S: A Comprehensive Review of the Advanced Refrigeration Controller

Introduction

The Eliwell EWCM 900 S is a sophisticated refrigeration controller designed to provide precise temperature control and monitoring for commercial refrigeration systems. As a leading manufacturer of refrigeration controls, Eliwell has established a reputation for delivering high-quality products that meet the needs of the refrigeration industry. In this blog post, we'll take a closer look at the features and benefits of the Eliwell EWCM 900 S, and explore how it can help refrigeration professionals optimize their systems.

Overview of the Eliwell EWCM 900 S

The Eliwell EWCM 900 S is a microprocessor-based controller designed for use in commercial refrigeration applications, including walk-in coolers, freezers, and display cases. The controller features a user-friendly interface and provides precise temperature control, defrost management, and alarm functions. The EWCM 900 S is designed to be easy to install, program, and maintain, making it an ideal choice for refrigeration professionals.

Key Features of the Eliwell EWCM 900 S

The Eliwell EWCM 900 S offers a range of advanced features that make it an ideal choice for commercial refrigeration applications. Some of the key features of the controller include:

• Precise Temperature Control: The EWCM 900 S provides precise temperature control, with an accuracy of ±0.1°C. This ensures that refrigerated products are stored at the optimal temperature, reducing the risk of spoilage and improving food safety.
• Defrost Management: The controller features advanced defrost management, including automatic defrost initiation and termination. This helps to prevent ice buildup on evaporator coils, ensuring optimal system performance and reducing energy consumption.
• Alarm Functions: The EWCM 900 S features a range of alarm functions, including temperature alarms, sensor failure alarms, and system malfunction alarms. This ensures that refrigeration professionals are notified quickly in the event of a problem, allowing them to take prompt action to prevent product spoilage.
• Modbus Communication: The controller features Modbus communication, allowing it to be integrated with other building management systems (BMS) and refrigeration control systems.

Benefits of the Eliwell EWCM 900 S

The Eliwell EWCM 900 S offers a range of benefits for refrigeration professionals, including:

• Improved Temperature Control: The controller's precise temperature control ensures that refrigerated products are stored at the optimal temperature, reducing the risk of spoilage and improving food safety.
• Increased Energy Efficiency: The EWCM 900 S's advanced defrost management and temperature control features help to reduce energy consumption, lowering operating costs and improving system efficiency.
• Enhanced Reliability: The controller's robust design and advanced alarm functions help to prevent system failures and reduce downtime, ensuring that refrigeration systems operate reliably and efficiently.

Conclusion

The Eliwell EWCM 900 S is a sophisticated refrigeration controller that offers precise temperature control, advanced defrost management, and alarm functions. Its user-friendly interface and Modbus communication capabilities make it easy to install, program, and integrate with other building management systems. By providing improved temperature control, increased energy efficiency, and enhanced reliability, the Eliwell EWCM 900 S is an ideal choice for refrigeration professionals looking to optimize their commercial refrigeration systems.

Specifications

• Supply voltage: 24VAC or 230VAC
• Operating temperature: -10°C to 50°C
• Storage temperature: -20°C to 70°C
• Humidity: 20-90% RH
• Dimensions: 144 x 72 x 50mm

Eliwell EWCM 900 S: A Comprehensive Guide to the Advanced Refrigeration Controller Eliwell is a brand (now part of Schneider

In the world of refrigeration, precision and control are paramount to ensuring the optimal storage and preservation of perishable goods. The Eliwell EWCM 900 S is a sophisticated refrigeration controller designed to provide advanced temperature control and monitoring capabilities for commercial refrigeration systems. In this article, we will explore the features, benefits, and applications of the Eliwell EWCM 900 S, as well as its technical specifications and installation requirements.

Introduction to Eliwell EWCM 900 S

The Eliwell EWCM 900 S is a microprocessor-based controller designed for use in commercial refrigeration applications, including walk-in coolers, freezers, and display cases. The controller provides precise temperature control, data logging, and alarm functions to ensure the safe and efficient operation of refrigeration systems. The EWCM 900 S is part of Eliwell's extensive range of refrigeration controllers, which are renowned for their reliability, accuracy, and ease of use.

Key Features of Eliwell EWCM 900 S

The Eliwell EWCM 900 S boasts an impressive array of features that make it an ideal choice for commercial refrigeration applications. Some of the key features include:

1. Precise Temperature Control: The EWCM 900 S provides precise temperature control, with an accuracy of ±0.1°C, ensuring that stored products are maintained at the optimal temperature.
2. Digital Display: The controller features a large, easy-to-read digital display that shows the current temperature, setpoint, and alarm status.
3. Data Logging: The EWCM 900 S can log temperature data for up to 100 days, allowing users to monitor temperature trends and identify potential issues.
4. Alarm Functions: The controller provides comprehensive alarm functions, including temperature alarms, sensor faults, and system errors, ensuring that users are notified of any issues promptly.
5. Communication Capabilities: The EWCM 900 S features RS485 communication capabilities, enabling users to connect the controller to a network or a PC for remote monitoring and control.
6. Configurable Inputs and Outputs: The controller has configurable inputs and outputs, allowing users to customize the controller to suit their specific application.

Benefits of Eliwell EWCM 900 S

The Eliwell EWCM 900 S offers numerous benefits to users, including:

1. Improved Temperature Control: The controller's precise temperature control capabilities ensure that stored products are maintained at the optimal temperature, reducing the risk of spoilage and extending shelf life.
2. Increased Energy Efficiency: The EWCM 900 S's advanced control algorithms and configurable inputs and outputs enable users to optimize their refrigeration system's performance, reducing energy consumption and costs.
3. Enhanced Monitoring and Control: The controller's data logging and alarm functions provide users with real-time monitoring and control capabilities, enabling them to respond promptly to any issues.
4. Reduced Maintenance: The EWCM 900 S's comprehensive alarm functions and data logging capabilities help identify potential issues before they become major problems, reducing maintenance costs and downtime.

Technical Specifications

The Eliwell EWCM 900 S has the following technical specifications:

1. Power Supply: 230VAC, 50/60Hz
2. Operating Temperature: -10°C to 50°C
3. Storage Temperature: -20°C to 70°C
4. Humidity: 20 to 80% RH
5. Input Type: NTC, PTC, or 4-20mA
6. Output Type: Relay or 4-20mA

Installation Requirements

The Eliwell EWCM 900 S is relatively easy to install, but it does require careful consideration of the following factors:

1. Mounting: The controller should be mounted in a secure, easily accessible location, away from sources of heat or moisture.
2. Wiring: The controller's wiring should be installed in accordance with local electrical regulations and codes.
3. Sensor Installation: The temperature sensor should be installed in a location that provides accurate temperature readings, such as in the evaporator or in the refrigerated space.

Applications

The Eliwell EWCM 900 S is suitable for a wide range of commercial refrigeration applications, including:

1. Walk-in Coolers and Freezers: The controller's precise temperature control and data logging capabilities make it an ideal choice for walk-in coolers and freezers.
2. Display Cases: The EWCM 900 S's configurable inputs and outputs and comprehensive alarm functions make it suitable for display cases, including glass-door merchandisers and refrigerated display cabinets.
3. Cold Storage Rooms: The controller's advanced control algorithms and communication capabilities make it suitable for cold storage rooms, where precise temperature control and monitoring are critical.

Conclusion

The Eliwell EWCM 900 S is a sophisticated refrigeration controller designed to provide advanced temperature control and monitoring capabilities for commercial refrigeration systems. Its precise temperature control, data logging, and alarm functions make it an ideal choice for a wide range of commercial refrigeration applications, including walk-in coolers and freezers, display cases, and cold storage rooms. By understanding the features, benefits, and technical specifications of the EWCM 900 S, users can optimize their refrigeration systems' performance, reduce energy consumption, and improve product safety and quality.

Eliwell EWCM 900 S is a specialized controller designed to manage refrigeration machine rooms. It is primarily used for controlling compressor racks (including single, multi-stage, or different capacity units) and condenser fans. Eliwell France Key Specifications : Features 11 relay outputs that can be configured for either compressors or fans.

: Supports two 4–20 mA pressure transducers or two NTC temperature probes for suction and condensing inputs.

: Includes 11 opto-isolated digital alarm inputs linked to the outputs. Connectivity : Equipped with an RS-485 serial port for connection to the Televis monitoring system.

: Standard 72x144 mm flush panel mount housing with a depth of 120 mm. Refrigerants

: Compatible with common gases including R22, R134A, R404A, R407C, and R507. Eliwell France Programming & Operation The controller uses two levels of programming: Operating (oPr) : Accessible by pressing Configuration (CnF) : Accessible by pressing PRG (twice) + UP Eliwell France

The interface includes a double 3-digit display to show probe values and alarm codes, along with dedicated buttons for checking running hours ( ) and compressor maintenance status ( Eliwell France or specific parameter codes for your compressor configuration? EWCM 900/S rel. 5/2000 ing compressors and fans manager

The Eliwell EWCM 900 S is a microprocessor-based controller specifically engineered for managing the machine rooms of refrigeration systems, primarily focusing on compressor racks and condenser fans. Designed for industrial and commercial environments, this series provides a centralized solution for controlling complex refrigeration circuits, including single-unit or multi-stage systems. Key Technical Specifications The Eliwell EWCM 900 S

features a robust physical design and a wide range of I/O capabilities tailored for demanding refrigeration applications:

Physical Housing: Built in a black ABS plastic container measuring 72x144 mm with a depth of 120 mm.

Mounting: Designed for flush panel mounting using a 67x136 mm cut-out.

Power Supply: Typically operates on 230V AC (with 24V available upon request).

Relay Outputs: Equipped with 11 configurable relay outputs (6A 250V AC) used to manage various stages of compressors and fans.

Sensor Inputs: Supports NTC temperature probes or 4…20 mA pressure transducers for both suction and head pressure monitoring.

Refrigerant Compatibility: Pre-configured with conversion charts for standard refrigerants including R22, R134A, R502, R404A, R407, and R507. Operational Features and Functionality

The EWCM 900/S manual highlights several advanced functions that enhance the efficiency and safety of a refrigeration plant:

Compressor Management: It can control multiple compressors of varying capacities, including reciprocating types with stepped-capacities (partializations).

Condenser Fan Control: Manages fans based on head pressure or temperature to ensure optimal condensing phases.

Dual Setpoints: Features a clock function that allows users to toggle between "normal" and "economy" setpoints for energy saving during specific time periods.

Diagnostic & Safety System: Includes a continuous self-diagnosis routine. In the event of a controller failure, a dedicated breakdown relay can transfer control to an emergency system to prevent plant downtime.

Monitoring: The front panel features a dual 3-digit display and LED indicators for compressor status, alarm conditions, and running hours. Connectivity and Integration Eliwell Ewcm 900 S Access

5. Energy Efficiency

With rising energy costs, the controller’s efficiency features are vital. The unit supports "Eco" modes and Night & Day setpoints, allowing the system to relax temperature constraints during non-operational hours (like overnight) to save significant power.

Typical Applications

Due to its 16A relay output and flexible programming, the EWCM 900 S is found in:

• Medium/Large Cold Rooms: Controlling a single evaporator with antisweat heaters and lights.
• Retail Refrigeration Islands: Supermarket open or closed multi-deck cases.
• Beverage Coolers and Blast Chillers: Where precise temperature ramps and defrost cycles are critical.
• Pharmaceutical Storage: Meeting GDP (Good Distribution Practice) requirements with robust alarm and probe redundancy features.
• Industrial Chillers: As a standalone controller for small to mid-sized process cooling.

Programming the Parameters (The "PrG" Menu)

The true power of the Eliwell EWCM 900 S lies in its configuration menu. To access parameters:

1. Press and hold the "Set" button for 3 seconds until "PrG" (Program) appears.
2. Press "Set" again to enter.
3. Use UP/DOWN arrows to navigate parameters (e.g., "St1", "St2", "tdF", "FSt").
4. Press "Set" to edit value; UP/DOWN to change; "Set" to confirm.

3. Intuitive User Interface

Eliwell has prioritized usability. The interface features:

• A 4-digit LED display for clear temperature readings.
• Intuitive navigation keys.
• Visual alarms that alert users immediately when parameters fall out of range (e.g., high temp or sensor failure).