134587700 Frigidaire Washer Control Thermistor is a temperature-sensing component-specifically a thermistor-used in Frigidaire washing machines to provide temperature-dependent resistance feedback to the appliance control electronics. As a passive semiconductor device, it changes resistance with temperature (commonly a negative temperature coefficient type) and is packaged and wired to interface with the washer’s main control board or temperature-sensing harness.
inside the appliance the thermistor’s primary role is to monitor temperature and supply that measurement to the control system so cycle logic, water heating elements (when present), and safety interlocks can respond appropriately. It typically interacts directly with the main control board, and indirectly with subsystems such as the heater, water inlet/valve logic, and diagnostic routines; accurate readings ensure that the machine applies the correct heat profile for selected cycles and can trigger fault responses if temperatures move outside safe limits.
In this article readers will find a technical explanation of the thermistor’s operating principle and expected behavior,guidance on model compatibility and typical mounting locations,common failure symptoms and diagnostic indicators,practical troubleshooting steps (resistance measurements,wiring and connector checks,and interpreting control board error codes),and replacement considerations including matching electrical characteristics,connector type and mounting method,and safe handling procedures. The information is presented to help technicians, engineers, or appliance owners assess performance, isolate faults, and select an appropriate replacement while following the manufacturer’s service practices.
Table of Contents
- Function and Role of the Control Thermistor in Wash Cycle Temperature Regulation
- How the 134587700 Frigidaire Washer Control Thermistor Detects Temperature and Interfaces with the Main Control Board
- Common Failure Symptoms: Erratic Temperature Readings, Cycle Interruptions, and Diagnostic Codes
- Replacement Considerations and Installation: Specifications, Connector Pinout, and Calibration Procedures
- Q&A
- Final Thoughts
Function and Role of the Control Thermistor in Wash Cycle Temperature Regulation
The 134587700 Frigidaire Washer Control Thermistor is a temperature-sensing resistor (typically an NTC type) that provides the washer control board with real-time wash-basin temperature feedback. It forms part of a voltage-divider input to the main controller so that changes in resistance translate into predictable voltage changes the board reads; the controller uses that input to control the heater element,adjust fill temperature by mixing hot and cold valves,and select cycle profiles that depend on measured temperature. The component mounts near the tub or in the inlet path, connects with a two-wire plug to the harness, and must present the expected resistance/voltage range for the controller to interpret temperature accurately and decide when to energize heating or advance cycle stages.
- Normal behavior: resistance decreases as temperature rises; controller reads a smooth, monotonic voltage curve.
- Failure symptoms: off-temperature washes, extended heating times, heater staying on or off, or stored fault codes related to temperature sensing.
- Basic diagnostics: check connector and wiring for continuity, measure thermistor resistance at ambient and compare to expected trend, and verify voltage at the control input under operation.
In practice, technicians test the thermistor with a DMM by measuring resistance at known temperatures (ambient water vs.heated water) to confirm the negative temperature coefficient profile; a near-open circuit,short,or a resistance value outside the control board’s expected range indicates replacement is required. Replacing the part with the correct 134587700 Frigidaire Washer Control Thermistor ensures electrical compatibility (connector type and resistance range) so the controller’s thermistor scaling and temperature thresholds remain valid; after replacement, verify proper heater cycling and temperature-related diagnostics during a test wash cycle.
| item | Description |
|---|---|
| type | negative Temperature coefficient (NTC) thermistor |
| Function | Provides temperature feedback to the washer’s control board for heater and valve control |
| Interface | Two-wire connector; forms part of a voltage-divider input to the controller |
| Common failure modes | Open circuit, resistance drift, intermittent connection, connector corrosion |
How the 134587700 Frigidaire Washer Control Thermistor Detects Temperature and Interfaces with the Main Control Board
the 134587700 Frigidaire Washer Control Thermistor is a negative temperature coefficient (NTC) sensor that changes resistance with water and drum temperature to provide the main control board with a continuous temperature reading. Mounted in the tub area and connected through the washer’s wiring harness, the thermistor’s resistance falls as temperature rises; the control board measures that change as a voltage drop in a sensing circuit. In practical terms, the part supplies the board with the analog information needed to time heater operation, select appropriate wash/rinse thresholds, and validate that temperature-dependent cycles (sanitary, delicate warm washes) reach their setpoints.
- Behavior: resistance decreases with increasing temperature (NTC characteristic).
- Electrical interface: typically a two‑wire sensor forming part of a voltage divider to an ADC input on the control board.
- Common fault symptoms: incorrect water temperature reporting, heater not energizing, or temperature-related fault codes.
The thermistor interfaces to the main control board via a simple analog input: the board provides a reference or pull‑up, reads the sensor voltage, and converts that voltage to a temperature using a stored lookup or formula. Compatibility depends on matching the thermistor’s resistance curve and connector type to the control board’s expectation; substituting a sensor with a diffrent resistance profile will produce incorrect temperature readings and improper control logic. for troubleshooting, technicians measure the thermistor resistance at a known temperature and compare it to the expected curve, check harness continuity and connector contact, and verify the control board’s pull‑up voltage and ADC input behavior before replacing parts.
| item | Description |
|---|---|
| Type | NTC thermistor (two‑wire temperature sensor) |
| Typical resistance at 25°C | Approximately 10 kΩ (example reference; verify against service data) |
| Connector | Two‑pin harness to main control board |
| Signal to board | Analog voltage forming a voltage divider input to ADC |
Common Failure Symptoms: Erratic Temperature Readings, Cycle Interruptions, and Diagnostic Codes
The 134587700 Frigidaire Washer Control Thermistor is a temperature-sensing element that provides the washer control board with a variable resistance signal proportional to tub and wash-water temperature. As a NTC device, its resistance falls as temperature rises; the control interprets that resistance (or the corresponding voltage after a pull-up) to decide when to start or stop heater elements, select wash/rinse profiles, or trigger temperature-dependent timing. Replacement compatibility requires matching the thermistor’s resistance-versus-temperature curve and connector pinout to the original part – a physically similar sensor with a different curve can produce incorrect temperature readings even though it plugs into the harness correctly. For field service,verify part number,harness wiring,and mounting location before replacing the thermistor to avoid swapping in a unit with incompatible characteristics.
- Erratic or fluctuating temperature readouts on the user interface or in service mode.
- Cycle interruptions or pauses during temperature-controlled steps (wash, rinse, or sanitize) where the machine aborts or repeats sections.
- Recurring diagnostic codes that reference temperature/sensor circuits or trigger sensor-related fault routines.
- Intermittent behavior that changes when connectors are moved, indicating a wiring or connector issue rather than a steady thermistor drift.
| Item | description |
|---|---|
| Sensor type | Negative temperature coefficient (NTC) thermistor; resistance decreases as temperature increases. |
| Diagnostic test | Measure resistance at a known temperature, then apply controlled heat (warm water) and confirm resistance decreases monotonically; compare curve to OEM specification. |
| common causes of false symptoms | Loose/corroded connector pins, chafed wiring, or poor contact at the control board; these can mimic a failing thermistor. |
Troubleshooting should isolate the sensor from the harness and the control board: confirm a stable, predictable change in resistance with temperature at the thermistor leads first, then verify the harness continuity and control-board input voltage. If resistance behavior is correct at the sensor but the control still reports faults or interrupts cycles, inspect the wiring and the control board’s sensor input circuitry for intermittent opens, shorts to ground, or failed pull-up components; correcting wiring faults often restores normal operation without replacing the thermistor. When replacing a failed unit, use the OEM 134587700 part or an exact electrical equivalent to maintain correct temperature control and diagnostic behavior.
Replacement Considerations and Installation: Specifications, Connector Pinout, and Calibration Procedures
The 134587700 Frigidaire Washer Control Thermistor is a passive temperature sensor used by the washer’s main control to monitor tub and water temperature so the controller can select appropriate fill, wash, and drain behaviors. The thermistor exhibits an NTC (negative temperature coefficient) characteristic – resistance decreases as temperature rises – so replacement units must match the original device’s resistance-versus-temperature curve and connector style rather than only the nominal resistance at one temperature. When selecting a replacement, verify mechanical fit, harness compatibility, and the expected resistance table in the service manual; a rapid bench check with a multimeter at ambient and after warming (or cooling) will reveal whether the part follows the expected curve and is therefore functionally compatible with the control board and wash cycles that rely on accurate temperature feedback.
Installation requires basic electrical safety and attention to connector pinout and sensor placement. Before installing, remove power, label wiring if needed, and confirm the two terminals correspond to the control harness. Thermistors are typically polarity-insensitive, so orientation of the two conductors does not affect sensing, but poor electrical contact or stray heating from nearby components will skew readings. After mounting the sensor in the correct location and securing the harness away from heat sources and moving parts,verify operation using the washer’s service diagnostics or by measuring resistance at known temperatures; if the board offers an adjustable offset or calibration entry,use the service procedure to align the displayed or logged temperature to a reference thermometer rather than attempting arbitrary adjustments.
- Disconnect power and document connector positions before removal.
- Measure ambient resistance and compare to the service resistance-temperature table.
- Ensure secure, strain-relieved wiring and correct sensor seating in the tub or inlet path.
- Validate in a diagnostic or test cycle and adjust offset only per service manual procedures.
| Item | Description |
|---|---|
| Connector | Typically a 2‑pin harness; confirm physical match to control board connector |
| Pinout | Pin 1: thermistor terminal A; Pin 2: thermistor terminal B – no polarity |
| Reference | Resistance vs. temperature curve required from service manual (example: many NTC thermistors ≈10 kΩ at 25°C; verify exact spec) |
Q&A
What is the 134587700 Frigidaire Washer Control Thermistor and what does it do?
The 134587700 thermistor is a temperature sensor (usually an NTC type) used by certain Frigidaire washers to monitor water or tub temperature and send that information to the washer’s control board. The control board uses the thermistor signal to select fill temperature,control an internal heater (if equipped),and manage cycle logic for proper detergent action and fabric care.
What symptoms indicate the thermistor might be failing?
Common symptoms include incorrect water temperature during cycles (too hot or too cold), persistent temperature-related error codes, cycles that take much longer than normal, the washer not advancing temperature-dependent functions, or the internal heater not switching on when it should.Intermittent or erratic temperature readings can also cause inconsistent cycle performance.
How can I test the thermistor to see if it’s working correctly?
With the washer unplugged and the thermistor disconnected, use a digital multimeter set to measure resistance (ohms). The thermistor should show a resistance that changes with temperature: resistance decreases as temperature rises (for an NTC thermistor). A simple functional test is to measure resistance at room temperature, then place the sensor in ice water and re-measure (resistance should increase), and then in warm water (resistance should decrease). For exact ohm values at specific temperatures, consult the Frigidaire service manual or the part datasheet; the absolute values can vary by part and model.
Do I need to program or calibrate the washer after replacing the thermistor?
Most Frigidaire washers do not require programming or calibration after replacing the thermistor. The control board reads the sensor on the next power-up and uses the input normally.However, if your model stores learned offsets or requires a service mode reset, consult the model-specific service manual or perform a basic power cycle (unplug for 1-2 minutes) and run a diagnostic cycle if available.
how difficult is it to replace the 134587700 thermistor and what safety precautions should I take?
Replacement is typically straightforward for someone comfortable with basic appliance repair: disconnect power, access the control panel or sensor housing (varies by model), unplug the thermistor connector, remove the old sensor and install the new one, then reassemble. Safety precautions: always unplug the washer before working on it, avoid working on wet surfaces, take care with sharp sheet metal and connectors, and note connector orientation before removing. If the washer has an internal heater, also ensure no water or power is present before touching wiring.
How can I be sure the 134587700 part is compatible with my washer model?
Verify compatibility by checking your washer’s model and serial number against the part listing from Frigidaire or an authorized parts distributor. Use Frigidaire’s parts lookup or reputable parts websites and enter your exact model number to confirm. Third-party listings may look similar but always cross-check part numbers and schematic references to avoid buying an incompatible sensor.
Where can I buy the 134587700 thermistor and how much should I expect to pay?
The part is available from Frigidaire-authorized parts distributors, major appliance part retailers, and some online marketplaces.Prices vary with supplier and region; expect a modest cost typical for a sensor (often in the low tens to low hundreds of dollars depending on source and whether it’s OEM). Prefer OEM or verified aftermarket parts from reputable sellers and check return policies and warranty coverage.
What are common mistakes to avoid when diagnosing or replacing the thermistor?
Common mistakes include assuming the thermistor is bad without checking wiring and connectors (loose, corroded or damaged connectors can cause the same symptoms), relying on a single resistance measurement without testing at different temperatures, using incorrect replacement parts that have a different resistance curve, and working on the appliance while it’s still powered. Always verify wiring continuity to the control board and consult wiring diagrams or service manuals when in doubt.
Final Thoughts
The 134587700 Frigidaire Washer Control Thermistor plays a critical role in washer operation by monitoring water temperature and relaying that information to the control board. Accurate temperature feedback helps the machine select and regulate wash cycles appropriately, protecting fabrics, optimizing detergent performance, improving energy efficiency, and contributing to overall appliance reliability.
Because the thermistor directly influences cycle control and component coordination,prompt and accurate diagnosis of thermistor-related faults is important to avoid unnecessary parts replacement and to restore proper performance. When replacement is required, using the correct part and following appropriate diagnostic and service practices helps ensure consistent temperature sensing and prevents secondary issues that can arise from improper repair.
Ultimately, attentive diagnosis and the use of the right replacement component preserve the washer’s functionality, safety, and longevity. Engaging qualified service personnel or following manufacturer-recommended procedures when testing or replacing the 134587700 thermistor supports reliable operation and protects the appliance investment.
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