134587700 Frigidaire Washer Control Thermistor is a temperature-sensing component used in Frigidaire washing machines; it is a thermistor-type sensor (commonly an NTC, or negative temperature coefficient, device) whose electrical resistance varies predictably with temperature. As a passive semiconductor temperature sensor, the thermistor converts the thermal state of the washer’s tub or inlet water into a resistance value that the machine’s control electronics can measure and interpret.
Inside the appliance, the thermistor provides real-time temperature feedback to the washer’s main control board and associated control circuitry. It typically interfaces with the wash cycle logic, water heating or mixing functions, and safety interlocks-helping the controller determine when to call for hot/cold valve adjustments, engage a heating element (if present), or advance cycle stages that depend on a specific temperature. The sensor is usually mounted in contact with the tub, heater assembly, or water flow path so that its readings represent the water or drum temperature relevant to cycle control.
In this article readers will find a technical overview of the thermistor’s operating principle, typical installation locations, and how it integrates with control systems; information on compatibility and identifying the 134587700 part relative to other sensor variants; common failure symptoms and diagnostic cues (such as inconsistent temperature readings, error codes, or failure to reach target temperatures); basic troubleshooting strategies a technician can apply to isolate sensor issues versus wiring or control-board faults; and practical considerations when replacing the part, including connector matching, mounting and sealing concerns, and verification of correct function after replacement.
Table of Contents
- Thermal Sensing Function and Role of the Control Thermistor in Frigidaire Washers
- How the 134587700 Frigidaire Washer Control Thermistor Interfaces with the Control Board and Temperature Regulation Circuit
- Common Failure Symptoms and Diagnostic Indicators for the Control Thermistor
- Compatibility, Replacement Considerations, and Troubleshooting procedures for Installation and Field Diagnosis
- Q&A
- In Summary
Thermal Sensing Function and role of the Control Thermistor in Frigidaire Washers
The 134587700 Frigidaire Washer Control Thermistor is a temperature-sensing resistor mounted to the washer’s tub or control harness that provides the electronic control board with continuous temperature feedback. It is typically an NTC (negative temperature coefficient) device whose resistance falls as temperature rises; the control uses that resistance-to-temperature relationship to regulate heater operation,select appropriate cycle timings,and validate high-temperature options such as sanitize or hot-wash. In practical service, compatibility requires matching the thermistor’s resistance curve and connector type to the washer’s control board-substituting a thermistor with a different characteristic can cause incorrect temperature readings and improper cycle behavior even if the connector fits physically.
Technically, failure modes include open-circuit, short, or drift in the resistance curve; each produces distinct operational symptoms. Technicians should verify continuity and measure resistance at a known ambient temperature with a multimeter,then compare readings to the service specification for that model family. Common field indicators of thermistor problems include persistent temperature-related error codes, the heater failing to engage during a high-temp cycle, or the washer cutting off heat prematurely while reporting an over-temperature condition. For diagnostics, inspect the wiring and connector for corrosion or damage, confirm the control board’s sensing circuit is intact, and replace the thermistor when measured values are outside the specified tolerance.
- Symptoms of thermistor fault: incorrect water temperature reporting, heater not activating, or error codes related to temperature sensing.
- Key checks: resistance vs. ambient reference, connector integrity, and wiring continuity to the control board.
- Replacement guidance: use an OEM-equivalent thermistor with the same resistance curve and connector to ensure compatibility.
| Item | Description |
|---|---|
| Type | NTC thermistor (resistance decreases as temperature increases) |
| Function | Provides continuous temperature feedback to the washer control board |
| Typical connector | Two-pin harness compatible with Frigidaire control boards |
How the 134587700 Frigidaire Washer Control Thermistor Interfaces with the Control Board and temperature regulation Circuit
134587700 Frigidaire Washer control Thermistor is a temperature-sensing resistor that interfaces directly with the washer’s main control board as an analog feedback element. The part is typically an NTC device (resistance falls as temperature rises) wired into a voltage-divider or pull-up network on the control board so the microcontroller can read a voltage proportional to water temperature. The board converts that voltage to temperature using a calibration curve or lookup table, then uses the reading to sequence valves, enable the heater element, or adjust cycle timing – for example, enabling the heater until the measured temperature reaches the selected setpoint and then opening cold-water inlet or cycling power to maintain temperature within a hysteresis band.
- Interface: two-wire sensor into a voltage-divider feeding an ADC input on the control board.
- Control action: closes heater relay or modulates drive until measured temperature meets setpoint.
- Common faults: open-circuit or out-of-spec resistance yields incorrect cold/hot readings and may trigger error codes or prevent heating.
- diagnostics: measure sensor resistance vs.expected R-T curve and backprobe the ADC input for expected voltage swing during warm-up.
Practical compatibility requires replacing the thermistor with a unit that matches the original resistance-versus-temperature characteristic and connector; a sensor with a different curve will produce inaccurate temperature readings even if it fits mechanically.On the control board side, temperature regulation is usually implemented as simple on/off control with hysteresis or time-proportional switching of the heater, and the board relies on redundant safety elements (thermal cutouts or fuses) to prevent over-temperature conditions if the sensor fails. Technicians typically verify operation by measuring the sensor resistance at ambient,re-measuring in known warm water,and confirming the control board’s ADC voltage changes accordingly before replacing the sensor or further diagnosing heater/relay circuits.
| Item | Description |
|---|---|
| Type | Negative Temperature Coefficient (NTC) thermistor |
| Interface | Two-wire voltage divider feeding an ADC input on the control board |
| Diagnostic | Multimeter resistance check and backprobe ADC voltage during warm-up |
Common Failure Symptoms and Diagnostic Indicators for the Control Thermistor
The 134587700 Frigidaire Washer Control Thermistor is an NTC (negative temperature coefficient) sensor that reports tub or water temperature to the washer’s main control board by varying its electrical resistance. In normal operation the control interprets the thermistor’s resistance curve to manage heater operation,water fill temperature selection and timed steps in the wash cycle. Mechanical fit between models may be interchangeable, but the thermistor must present the correct resistance-versus-temperature characteristic to the control; a physically compatible part with a different NTC curve can produce incorrect temperature readings even if it plugs in correctly.
Failing thermistors show reproducible symptoms and measurable diagnostic indicators that technicians can verify with basic tools. Common observable symptoms include improper or inconsistent water temperature, heater not switching on or running continuously, cycles that stall or skip temperature-dependent steps, and intermittent temperature-related faults reported by the control. Diagnostic checks that confirm thermistor failure include measuring resistance across the two sensor terminals with a digital multimeter (resistance should decrease smoothly as the sensor is warmed),checking for an open circuit or short to ground,and confirming wiring/harness continuity and connector integrity; if the resistance does not change predictably with temperature or is out of the range specified in the service data,replace the sensor.
- Inaccurate or fluctuating temperature readings reported to the control
- Heater not energizing when expected or running without reaching set temperature
- Cycles that fail to progress through temperature-dependent steps
- Open-circuit resistance or no change in resistance with temperature
| Item | Description |
|---|---|
| Expected behavior (NTC) | Resistance decreases smoothly as temperature rises; control references this curve |
| Failure indicators | Open circuit, short, or no measurable change in resistance with temperature; wiring/connector faults |
Compatibility, Replacement Considerations, and Troubleshooting Procedures for Installation and Field Diagnosis
The 134587700 Frigidaire Washer Control Thermistor is a temperature-sensitive resistor that provides the washer control board with real-time temperature feedback used to regulate cycle selection, spin behavior, and fault detection. In normal operation the thermistor exhibits a predictable change in resistance as the sensed temperature changes (typically an NTC characteristic – resistance decreases as temperature rises). The control board interprets that resistance against a programmed curve; therefore any replacement must match not only the electrical connector and lead length but also the thermistor’s resistance-temperature curve to maintain correct algorithm behavior and avoid incorrect cycle decisions or spurious error codes.
Troubleshooting focuses on verifying the thermistor’s electrical behavior and the integrity of its connection to the control board. Common field checks include measuring resistance at ambient temperature and confirming a monotonic change in resistance when the sensor is warmed (by warm water or a calibrated heat source) or cooled; an open circuit, resistor that does not change with temperature, or intermittent wiring are typical failure modes. Replacement considerations: prefer OEM part numbers or aftermarket parts specified to match the original resistance curve and connector; if replacing the sensor without replacing the control board, confirm mechanical fit and secure strain relief to avoid chafing. Use the checklist below for quick diagnostics and reference the table for key technical notes.
- Symptoms: temperature-related fault codes, incorrect cycle durations, no temperature change reported on diagnostics, or intermittent errors under vibration.
- Quick test: unplug,remove connector,measure resistance at one known temperature,apply heat,re-measure to confirm expected change.
- Wiring check: inspect connectors for corrosion, continuity from sensor pins to the control board, and secure routing to prevent shorting against chassis.
| Item | Description |
|---|---|
| sensor type | NTC thermistor used for control-board temperature feedback |
| Diagnostics | Verify resistance change with temperature and continuity to the control board; compare behavior to service manual curve |
Q&A
what is the 134587700 Frigidaire washer control thermistor and what does it do?
the 134587700 is a temperature sensor (thermistor) used in many Frigidaire washers. It monitors the water temperature and sends a variable resistance signal to the washer’s control board. The control board uses that information to manage fill temperature, wash cycles, and to display temperature-related errors.
What are the common symptoms of a failing thermistor?
Common symptoms include incorrect water temperature (too hot or too cold), washer stopping mid-cycle, cycles taking much longer than normal, or the washer displaying temperature-related faults (refer to your model’s error codes). Intermittent operation or no temperature reading are also signs. Note that wiring and connectors should be checked first,as they are frequent causes of similar symptoms.
How can I test the thermistor to see if it’s bad?
Unplug the washer and access the thermistor connector. With the thermistor disconnected from the harness, measure resistance across its two terminals with a digital multimeter. A thermistor is typically NTC (negative temperature coefficient), so resistance decreases as temperature rises.Verify that the resistance changes when you warm or cool the sensor (for example by holding it in your hand then dipping it in ice water). if the resistance is open, shorted, or does not change with temperature, the thermistor is likely bad. Consult your model’s service manual for the exact resistance vs.temperature specifications.
What are the correct resistance values for this thermistor?
Exact resistance values vary by design and model. Many washer thermistors are in the kiloohm range at room temperature (commonly around several kiloohms), and will change predictably with temperature. Do not rely on generic numbers – check the service manual or technical sheet for your specific washer model or the part’s specification sheet to get the correct resistance-to-temperature table for accurate diagnosis.
Is the thermistor arduous to replace and do I need a technician?
Replacement is generally straightforward for someone pleasant working on appliances: power off and unplug the washer, access the sensor location (control panel or tub area depending on model), unplug the two-pin connector, remove the mounting clip or bracket, and install the new sensor. However,if you’re not experienced with appliance repair,uncomfortable accessing internal components,or the issue could be wiring or the control board,hiring a qualified technician is recommended. Always disconnect power before working on the appliance.
How can I be sure the 134587700 is compatible with my washer?
Verify compatibility by checking your washer’s model number against the part number 134587700 in the manufacturer’s parts list, the appliance manual, or a reputable parts website. Cross-reference the part number and confirm the sensor’s mounting style and connector match your washer. If in doubt, provide your model number to the parts supplier or technician to confirm fitment.
What can cause a thermistor to fail and how can I prevent it?
common causes of failure include moisture intrusion, corrosion of the terminals, physical damage, or wiring harness issues (chafing, broken wires, or loose connectors). To help prevent failure, keep the washer sealed properly, avoid overtightening or misrouting wiring during repairs, and inspect wiring/connectors if you have recurring temperature issues. Promptly repair any leaks that could allow water into the electronic areas.
After replacing the thermistor, do I need to do anything else (calibration or reset)?
Most washers do not require manual calibration after replacing the thermistor; the control board reads the new sensor automatically. Though, it’s a good practice to disconnect power for a minute or follow any reset procedure in the service manual to clear stored error codes. Run a test cycle and confirm the washer reads and uses temperature correctly. If errors persist, recheck wiring, grounding, and the control board inputs.
In Summary
The 134587700 Frigidaire Washer Control Thermistor is a critical sensing component that provides the control board with accurate water temperature feedback, enabling proper cycle selection, efficient heating, and protective regulation of wash functions. Its role directly impacts cleaning performance,energy use,and the prevention of overheating or improper cycles,making it an integral part of the washer’s control and safety systems.
Because temperature-related symptoms can arise from multiple causes, proper diagnosis-using the manufacturer’s service information and appropriate diagnostic tools-is essential before replacing the thermistor. Accurate testing helps avoid unnecessary parts replacement and ensures that related issues (wiring, connectors, control board faults, or heating elements) are not overlooked.
When testing confirms that the 134587700 thermistor is defective or out of specification, replacement with the correct part restores reliable temperature sensing and overall machine performance. For best results and safety, follow installation guidelines and consider professional service if you are not experienced with appliance repair. Proper diagnosis and timely replacement maintain operational efficiency, prolong appliance life, and reduce the risk of future faults.
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