134587700 Frigidaire Washer Control Thermistor is a temperature-sensing component used in Frigidaire washing machines; it is a thermistor (a resistor whose resistance varies predictably wiht temperature) that provides the electronic control system with a temperature-dependent electrical signal. In practice this part is implemented as a small packaged sensor-often an NTC-type device-designed to be connected to the washer’s control board or wiring harness and to present a known resistance-versus-temperature characteristic the controller can read and interpret.
Inside the appliance the thermistor’s role is to provide real-time temperature feedback that the control electronics use to make cycle decisions and manage any available heating elements or temperature-dependent logic. It typically interfaces directly with the main control board and is mounted where it can sense tub or water temperature (for models with heaters it might potentially be near the heater or in the water path); the measured value affects fill, wash, rinse selections, heater control, and protective algorithms that detect out-of-range conditions. Because the control algorithm expects a specific resistance curve and connector/mounting arrangement, the thermistor’s electrical and mechanical characteristics are significant for correct system behavior.
In this article readers will find a technical examination of the thermistor’s function and expected resistance-versus-temperature behavior, guidance on how to confirm compatibility and identify the correct replacement, a list of common failure symptoms and the diagnostic checks a technician can perform (resistance measurements at known temperatures, connector and harness inspection, and in-circuit versus out-of-circuit testing), and practical replacement considerations including matching the sensor’s curve and connector, verifying mounting and sealing, and safety precautions when servicing the control wiring. The goal is to provide actionable technical information for technicians, engineers, and appliance owners who need to diagnose, test, or replace this specific sensor in Frigidaire washers.
Table of Contents
- Function and Role of the Control Thermistor in Washer Temperature Regulation
- How the 134587700 Frigidaire Washer Control Thermistor Works Inside the Appliance
- Common Failure Symptoms and Diagnostic Measurements for the Thermistor
- Compatibility, Replacement Considerations, and Step‑by‑Step Troubleshooting Procedures
- Q&A
- Closing Remarks
Function and Role of the Control Thermistor in Washer Temperature Regulation
The 134587700 Frigidaire Washer Control Thermistor is a temperature-sensing element (typically an NTC thermistor) that provides the control board with a variable-resistance signal proportional to the tub or inlet water temperature. Mounted in contact with the wash tub or water inlet channel,the sensor changes resistance as temperature changes and the washer’s electronic control measures that resistance via an ADC input to determine whether to energize the heater,advance wash stages,or invoke temperature-based logic in detergent and soil-sensing routines. Compatibility requires a replacement that matches the original resistance-versus-temperature curve and connector pinout; substituting a thermistor with a different R-T characteristic can cause incorrect temperature readings even if the physical fit is correct.
The control board uses the thermistor reading to compare against programmed thresholds and closed-loop routines; such as, the board may switch the heater on until the measured resistance corresponds to the requested setpoint, then modulate or switch off the heater. Technicians can verify behavior by measuring resistance at known temperatures and comparing to the expected R-T values, or by observing control inputs and heater drive signals while running a temperature-specific step. Typical symptoms of a failing thermistor include incorrect temperature indications, heater cycling anomalies, and specific error codes; simple bench tests with a multimeter and basic in-cab diagnostics usually distinguish sensor failures from control-board faults.
- Common symptoms: inconsistent water temperature, heater never turns on, or frequent temperature error codes.
- Rapid checks: measure resistance at ambient and compare to expected R-T values; inspect wiring and connector for corrosion or breaks.
- Replacement guidance: use the same R-T curve and connector type; test after replacement by running a temperature-controlled cycle.
| Item | Description |
|---|---|
| Type | NTC thermistor with negative temperature coefficient used for tub/water sensing |
| Typical resistance at 25°C | Approximately 10 kΩ (verify against OEM specification for the 134587700 part) |
| Operating temperature range | Approximately 0°C to 100°C, depending on mounting and OEM specification |
| Interface | Two‑wire connector to the washer control board; matching pinout required for direct replacement |
How the 134587700 Frigidaire Washer Control Thermistor Works Inside the Appliance
The 134587700 Frigidaire Washer Control Thermistor is a small temperature-sensing component that provides the washer’s control board with an electrical resistance value that varies with temperature.Mounted near the tub or in the water inlet path, the thermistor is an NTC (negative temperature coefficient) device: its resistance falls as temperature rises.The control electronics convert that resistance into a temperature reading to determine when to activate the heater, switch to rinse or spin profiles, or adjust cycle timing. In practice a technician will measure resistance across the thermistor leads with a multimeter to verify that the resistance changes predictably when the sensor is warmed or cooled; a stable,predictable resistance curve indicates the part and its wiring are functioning and compatible with the control board software calibration for specific Frigidaire models that accept this OEM part number.
- Typical symptoms of a failing thermistor: incorrect or unstable water temperature, heater not activating, unusually long or short cycles, or temperature-related fault codes.
Compatibility depends on matching the sensor’s electrical characteristics and connector to the control board; replacement should use the same part number or an OEM-specified equivalent to avoid mismatched resistance curves that can cause incorrect temperature control. Fault conditions are usually either an open circuit (infinite resistance) or a short (very low resistance), and both should be confirmed with static resistance checks and dynamic checks during a cycle. When diagnosing, also inspect the harness and connector for corrosion or damage because intermittent readings often stem from wiring issues rather than the thermistor itself. For installation, ensure secure mechanical placement and strain-relief on the leads so the sensor remains in direct contact with the measured medium and provides repeatable readings to the washer’s control system.
| Item | Description |
|---|---|
| Type | NTC temperature sensor used by the washer control |
| Function | Provides resistance-based temperature feedback to the control board |
| Failure modes | Open circuit, short, or intermittent readings due to wiring/connectors |
| Service check | Measure resistance at known temperatures and verify predictable change |
Common Failure Symptoms and Diagnostic Measurements for the Thermistor
The 134587700 Frigidaire Washer Control Thermistor is a temperature-sensing element that provides the washer control board with a variable resistance signal proportional to water or cabinet temperature. Moast washers use an NTC (negative temperature coefficient) thermistor, so resistance decreases as temperature rises; the control board interprets that resistance against a predefined curve to make temperature-dependent decisions. When replacing this part, match the electrical characteristics (resistance vs. temperature curve and beta value), connector type, and mounting location rather than only the physical shape; a thermistor with the wrong resistance curve can report incorrect temperatures even if it plugs in correctly.
Failure of the thermistor typically presents as temperature-related error conditions,incorrect cycle behavior,or diagnostic trouble codes from the control board.Technicians should measure the device with a digital multimeter: unplug the harness and measure resistance at a known ambient temperature, then apply a controlled heat source (warm water or heat gun on low) and confirm the resistance falls smoothly. Look for an open circuit (infinite resistance), a short (<100 Ω), or non-monotonic changes (resistance that does not change predictably with temperature). Verify wiring and connector continuity before condemning the thermistor, as harness faults and board input issues can mimic a bad sensor.
- Error indications related to temperature or sensor fault, erratic temperature readings, or cycles that skip temperature-dependent steps.
- resistance open/short or values that do not change when heated/cooled; compare against expected curve.
- Intermittent behavior caused by corroded connectors or broken harness wires rather than the sensor element itself.
| Item | Description |
|---|---|
| typical behavior | NTC thermistor: resistance decreases as temperature increases; expect kilo-ohm range at room temperature for many washer sensors. |
| Example reference | Approximate reference (example only): 0 °C ~ 30 kΩ, 25 °C ~ 10 kΩ, 50 °C ~ 3 kΩ – verify against OEM specification for 134587700. |
Compatibility, Replacement Considerations, and Step‑by‑Step Troubleshooting Procedures
The 134587700 Frigidaire Washer Control thermistor is an NTC temperature sensor used by the washer control board to monitor and regulate temperature-sensitive functions such as water temperature selection, cycle timing adjustments, and thermal protection of electronic components. The thermistor presents a predictable resistance change with temperature that the control’s ADC interprets as a temperature reading; thus compatibility depends on matching the sensor’s resistance‑vs‑temperature curve, connector type, and mechanical mounting to the original design. Substituting a sensor with a different curve or connector can produce incorrect temperature readings, unintended fault codes, or improper heater control even if the replacements physically fit the harness.
- Common symptoms: incorrect water temperatures, recurring temperature-related error codes, extended or stalled cycles, or sudden changes in cycle behavior.
- Quick checks: visually inspect wiring and connectors for corrosion, measure resistance at ambient temperature and while warming the sensor, and verify continuity between the connector and control board pins.
- Replacement considerations: confirm the replacement matches the OEM resistance curve and connector pinout, and check for any required calibration or self-test procedure after installation.
| Item | Description |
|---|---|
| Type | Negative Temperature Coefficient (NTC) thermistor used as a control input sensor |
| Typical failure modes | Open circuit, short circuit, resistance drift causing inaccurate readings |
| Key replacement checks | Match resistance vs. temperature curve, connector pinout, and mechanical mounting |
| Tools | Digital multimeter, calibrated thermometer or reference bath, basic hand tools |
troubleshoot by removing power, accessing the sensor leads at the harness, and measuring cold resistance with a multimeter; then apply a known thermal change (warm cloth or water at controlled temperature) and verify the resistance changes smoothly and predictably. If the sensor reads open, shorted, or shows an inconsistent curve, replace it and recheck in-circuit operation-also verify the control board sees the expected ADC values if you have a service monitor. After replacement,run a diagnostic or a temperature-influenced cycle to ensure the washer responds correctly; if problems persist,re-inspect wiring,connector seating,and the control board for damaged traces or solder joints before assuming a second sensor failure.
Q&A
What is the 134587700 Frigidaire washer control thermistor and what does it do?
The 134587700 thermistor is a temperature sensor used on many Frigidaire washers to monitor tub/water temperature. It is an NTC (negative temperature coefficient) type device: its electrical resistance changes with temperature (resistance falls as temperature rises). The washer’s control board reads that resistance to determine water/tub temperature and adjust cycles, fill amounts and timing accordingly.
What are common symptoms that the thermistor is failing?
Common signs of a bad thermistor include incorrect temperature readings, wash cycles that run too long or too short, failure to advance or end cycles, inconsistent warm/cold water behavior, and temperature-related fault/error codes on models that display diagnostics. You may also see the washer fail to heat (on models with internal heaters) or not run proper wash/rinse temperatures.
How can I test the thermistor with a multimeter?
Remove power to the washer, access and unplug the thermistor harness, and measure resistance across the thermistor leads with a digital multimeter. Because it is an NTC device, resistance should decrease as temperature increases. To verify this: measure at (a) room temperature, (b) after cooling the probe with ice water or a cold pack, and (c) after gently warming the sensor with warm water or a hair dryer. You should see a clear, steady drop in resistance as temperature rises. Exact ohm values vary by model-compare to the service sheet/specs if available-but the key test is that the resistance changes smoothly and predictably with temperature.
Are there expected resistance values or a chart for 134587700?
the precise resistance vs. temperature curve is specified in the washer’s service data and can vary by thermistor manufacturer. Many washer thermistors are common NTC types (such as, 10 kΩ at 25 °C), but you should not assume a value without checking the model’s service manual. If you don’t have the chart, verify the thermistor by confirming it shows a significant, monotonic decrease in resistance with increasing temperature; a fixed or erratic reading indicates failure.
Can I replace the thermistor myself, and what is the procedure?
yes, most owners or technicians can replace it. Steps: disconnect power, access the thermistor location (usually mounted to the tub or near the heater/inner housing), disconnect the wiring harness, remove any mounting clip or screw, swap in the new thermistor (134587700), secure it in the same position, reconnect the harness and restore power. Always handle wiring and connectors carefully,and follow the washer-specific disassembly instructions to avoid damaging panels or hoses.No special calibration is normally needed-the new thermistor is plug-and-play.
How do I be sure I’m ordering the correct replacement part?
Confirm compatibility by matching the washer’s full model number and the OEM part number (134587700) against the part seller or Frigidaire parts list. Some thermistors look similar but have different resistance curves or connector types, so verify physical connector style, mounting method and the appliance model number. When in doubt, consult the Frigidaire parts diagram or the appliance’s tech sheet.
Could wiring or the control board be causing temperature problems instead of the thermistor?
yes. Faulty wiring (open,shorted,or corroded connectors) between the thermistor and control board,or a failing control board input circuit,can produce incorrect temperature readings or error codes. Before replacing the thermistor, inspect connectors and wiring for damage and measure resistance directly at the thermistor leads and then at the control harness to confirm continuity.If the thermistor tests good and wiring is intact but the control reports errors, the control board may be at fault.
Any safety tips or things to avoid when testing or replacing the thermistor?
Always disconnect power before opening the washer or removing electrical connectors. don’t immerse the entire sensor or its connector in water-use only the sensing tip portion if you perform a wet test. Avoid using excessive heat that could melt plastic parts; use warm water or a controlled warm air source. Keep track of mounting orientation and clips so the replacement sits in the same location for accurate temperature sensing.
closing Remarks
The 134587700 Frigidaire Washer Control thermistor serves as a critical temperature-sensing component within compatible washer models, providing the control board with real-time temperature data that governs cycle selection, water heating, and timing. Accurate thermistor readings help ensure proper wash performance, energy efficiency, and protection of fabrics and internal components by allowing the machine to respond appropriately to programmed temperature requirements.
As temperature errors can cause incomplete cycles, poor cleaning results, or error codes, correct diagnosis of thermistor-related issues is essential. Symptoms such as persistent temperature-related fault messages, inconsistent water temperature, or irregular cycle behavior warrant inspection and testing of the thermistor and its associated wiring and connections. Proper diagnosis helps avoid unnecessary parts replacement and identifies whether the thermistor, control board, or another subsystem is the source of the problem.
When replacement is required, using the correct replacement part and following manufacturer-recommended procedures helps restore reliable operation and protect overall appliance longevity. Whether performed by a qualified technician or an experienced DIYer following safety guidance, timely and accurate replacement of a failing thermistor minimizes downtime and contributes to consistent washer performance. attention to diagnosis and appropriate replacement of the 134587700 thermistor supports safe, efficient, and dependable appliance operation.
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