WR07X10055 GE Refrigerator relay PTCR is a Positive Temperature Coefficient Relay (PTCR) used on many GE refrigerator compressors to control the compressor start circuit. As a thermistor-based start device, the PTCR provides a time‑dependent change in resistance when energized, allowing the compressor’s start winding to receive initial current and then progressively reducing that current once the motor has reached running speed.
Inside the appliance the WR07X10055 interacts directly with the compressor motor windings and the start/overload circuit; it is indeed typically mounted on or near the compressor or within the appliance control area. during start-up the PTCR provides the necessary starting current to the start winding (or modifies the circuit to produce a start pulse), then increases in resistance as it heats to remove the start contribution, allowing the run winding to carry normal load. As it is indeed integral to producing sufficient starting torque and preventing sustained current through the start winding, the PTCR affects whether the compressor will start reliably and whether other protection devices, such as the overload protector, are exposed to excessive stress.
In this article you will find a technical description of how the WR07X10055 functions, guidance on compatibility and how to confirm the correct replacement for a given compressor, common failure symptoms to recognize (such as hard starts, humming, or intermittent starting), recommended troubleshooting checks and measurements a technician can perform, and practical replacement considerations including mechanical and electrical fitment and safety precautions. the focus is on diagnostic and service information useful to technicians, engineers, and appliance owners evaluating or replacing this component.
Table of Contents
- Function and Role of the Refrigerator start Relay and PTCR in compressor Operation
- How the WR07X10055 GE Refrigerator Relay PTCR Operates Within the Compressor Start Circuit
- Identifying common Failure Symptoms of the Relay/PTCR and Resulting Compressor Performance Issues
- Compatibility and applicable GE Refrigerator Models for WR07X10055 replacement
- Replacement Considerations and Safe Installation Procedures for the Relay/PTCR
- Troubleshooting and Diagnostics: Testing the WR07X10055 Relay/PTCR and Isolating Circuit Faults
- Q&A
- Concluding Remarks
Function and Role of the Refrigerator Start Relay and PTCR in Compressor Operation
The WR07X10055 GE refrigerator Relay PTCR serves as a solid‑state start device for single‑phase refrigerator compressors, providing a controlled pulse of current to the start winding during motor startup and progressively removing that current as the compressor reaches operating speed. A PTCR (positive temperature coefficient resistor) has low resistance when cold, allowing high inrush current to the start winding; as current flows it heats internally and its resistance rises sharply, reducing start winding current without mechanical contacts. Compared with a mechanical start relay, a PTCR offers quieter operation and no contact wear, but it must match the compressor’s required start torque and thermal characteristics to avoid under‑ or over‑damping the start sequence.
In service, the PTCR and the external overload protector work together: the PTCR times and limits the start winding current while the overload protector limits sustained overcurrent conditions. Common failure modes include open PTCR (no start current) or a PTCR that remains conductive when hot (reduced resistance rise), both of which produce symptoms such as repeated hard starts, continuous humming, or excessive current draw. When replacing the device,verify terminal layout,physical mounting,and electrical characteristics; swapping in a WR07X10055 GE Refrigerator Relay PTCR where specified restores designed thermal time constant and start behavior,whereas using an incorrect PTCR can cause increased wear or failure to start.
- Typical symptoms of PTCR or start-relay issues: humming without compressor start, intermittent starts, higher than normal starting current, and frequent overload trips.
| Item | description |
|---|---|
| Function | Provides time‑dependent reduction of start winding current via temperature‑dependent resistance rise. |
| Interaction | Operates with the compressor’s start and run windings and the external overload protector to control inrush and protect against sustained faults. |
How the WR07X10055 GE Refrigerator Relay PTCR Operates Within the Compressor Start Circuit
The WR07X10055 GE Refrigerator Relay PTCR functions as a self‑regulating start assist in the compressor start circuit by providing a low cold resistance path to the compressor’s start winding and then rapidly increasing its resistance as it heats. When mains power is applied the PTCR element lets sufficient current flow to produce the initial torque; the device’s positive temperature coefficient causes its resistance to rise within a fraction of a second, effectively removing the start winding from the circuit without mechanical contacts. This behavior replaces a traditional relay or start capacitor arrangement in some GE compressor designs, and the PTCR resets to low resistance only after the compressor and relay cool, so timing and thermal characteristics must match the compressor’s specifications for reliable operation.
Practically, a technician can recognize PTCR operation by the absence of clicking (no electromechanical relay) and by measuring low resistance cold across the start terminal that increases sharply after the compressor runs. Typical failure modes include the PTCR failing shorted (preventing the start winding from being removed and causing overheating) or failing open (preventing the start winding from receiving the initial current), both of which present as a compressor that hums but will not start. Replacements should match the electrical and thermal ratings of the original unit; use of an incorrect PTCR can lead to repeated hard-start cycles or premature compressor wear. For troubleshooting, verify continuity cold, observe warm resistance behavior, and compare to manufacturer specifications before deciding to replace the assembly.
- Solid‑state operation: no moving parts or contact wear.
- Cold low resistance provides start current; resistance increases under heat to drop start winding current.
- Thermal time constant must suit the compressor’s rotor inertia and starting torque.
- Typical failure symptoms: hum, failure to start, or overheating if start winding stays engaged.
| Item | Description |
|---|---|
| Part | WR07X10055 GE Refrigerator Relay PTCR - solid‑state start assist for compatible compressors |
| Function | Provide initial start current to start winding, then increase resistance to remove start winding from circuit |
| Behavior | Low cold resistance → rapid resistive rise when heated; resets after cooling |
| Typical application | Direct replacement in refrigerators that specify a PTCR start relay with matching thermal/electrical characteristics |
identifying Common Failure Symptoms of the Relay/PTCR and Resulting Compressor Performance Issues
The WR07X10055 GE Refrigerator Relay PTCR is a replacement positive temperature coefficient resistor assembly used in the compressor start circuit of many GE refrigerator models. The PTCR functions as an electronic start device: at ambient (cold) temperature it presents a low resistance to feed the compressor start winding and provide the necessary phase shift and starting torque; as current flows and the device heats, its resistance rises sharply to drop the start winding out of the circuit. In service this part controls start current, reduces mechanical stress on the compressor during spin-up, and must match the electrical characteristics and mounting interface of the original relay for reliable compatibility.
- Compressor fails to start and only hums, frequently enough accompanied by repeated relay clicking or no click at all.
- Long or repeated run cycles where the compressor struggles to reach normal RPM and interior temperatures slowly decline.
- Overheating of the relay housing or discoloration at the relay terminals indicating excessive current or internal failure.
- electrical symptoms such as a tripped breaker, blown thermal protector on the compressor, or abnormal current draw measured with a clamp meter.
| Item | Description |
|---|---|
| Typical symptom | Humming compressor and failure to start – PTCR not providing low cold resistance to engage start winding. |
| Practical test | Measure cold resistance and observe rising resistance with applied current or heat; substitute a known-good relay to confirm. |
When the PTCR degrades or its resistance curve shifts, the compressor either cannot develop sufficient starting torque or experiences prolonged start currents that stress the motor and overload protector. A failed PTCR can lead to repeated protector trips, elevated run current, and premature wear on the compressor; conversely, a PTCR that fails short can keep the start winding engaged and cause overheating. Technicians and experienced owners diagnose these conditions with static resistance checks,current measurements during start,and by confirming the WR07X10055 GE refrigerator Relay PTCR matches the original part number and electrical ratings before replacement to restore correct start behavior and prevent recurrence.
Compatibility and Applicable GE Refrigerator models for WR07X10055 Replacement
The WR07X10055 GE Refrigerator Relay PTCR is a positive temperature coefficient resistor used as a start device on single-phase hermetic compressor motors. At power-up the PTCR presents a relatively low resistance to allow current into the compressor start winding; as current flows the device heats and its resistance rises rapidly, removing the start winding from the circuit. Functionally this replaces an electromechanical start relay in systems designed for a resistive start assist, and it also limits inrush current and reduces mechanical stress during repeated starts.
Compatibility depends on electrical and physical matching rather than refrigerator model name alone: the relay must match the compressor’s expected start circuit topology (typically three terminals labelled P/S/R or equivalent), the supply voltage (commonly 120 VAC on household GE units), the connector/harness type, and the available mounting space. Technicians confirm fit by comparing terminal labeling and spacing, measuring resistance characteristics if possible, and checking compressor/service manual cross-references; if the terminals and voltage match and the part fits the harness and bracket, the WR07X10055 will perform as the intended PTCR start device. Practical examples include replacing a failed PTCR on a single-compressor top-freezer unit by verifying the compressor plate lists a PTCR-compatible start scheme and by ensuring the replacement’s terminal pairings align with the existing P, S, and R leads.
- Verify terminal labels and spacing (P, S, R) against the compressor wiring harness.
- Confirm line voltage and inrush/current ratings match the compressor plate data.
- Check physical mounting and harness connector compatibility before installation.
- Use OEM cross-reference or service manual when model-level fitment is unclear.
| Item | Description |
|---|---|
| Function | PTCR start device: low resistance at startup, increases resistance as it heats to remove start winding |
| Terminals | Typically three conductors corresponding to P (power), S (start), R (run) or equivalent harness pins |
| Typical Voltage | 120 VAC for most household GE refrigerator compressors using this part type |
| Replacement considerations | Match terminal layout, voltage rating, physical mounting, and harness connector; consult compressor/service documentation for cross-reference |
Replacement Considerations and Safe Installation Procedures for the Relay/PTCR
The WR07X10055 GE Refrigerator Relay PTCR is a solid-state start device that uses a positive temperature coefficient resistor to limit current to the compressor start winding once the motor is running. In operation the PTCR presents a low resistance during initial energization to provide starting torque, then heats and increases resistance to remove the start winding from the circuit; this contrasts with electromechanical start relays or external start capacitors and eliminates moving parts. Before installing a replacement verify the WR07X10055 electrical specifications against the compressor nameplate (voltage, inrush current capability, and terminal spacing), and confirm physical compatibility with the mounting clip or plug‑in socket used on the manufacturer’s compressor-mismatched ratings or terminal arrangements can prevent reliable starts or damage the compressor motor.
Follow controlled diagnostic and replacement steps: verify the symptom (no start, humming, intermittent start), confirm the PTCR is the defective component with a resistance or continuity check, then perform a safe replacement procedure that preserves wiring integrity and equipment safety. Keep work confined to the low‑risk electrical side: disconnect power at the service disconnect or breaker, avoid opening the sealed refrigerant circuit, use insulated tools, secure spade terminals without overbending, and torque mounting clips to avoid vibration-induced loosening.After replacement, monitor inrush behavior and compressor temperature for several start cycles; if abnormal current draw or persistent failure occurs, stop and escalate to a motor or refrigeration specialist rather than repeatedly cycling the compressor.
- Power off at breaker and verify with a meter.
- Inspect and compare the old relay/PTCR to WR07X10055 for terminal layout and ratings.
- Measure continuity/resistance across start and run terminals before and after replacement.
- Use insulated spade connectors and avoid soldering sealed‑system terminals.
- Test with controlled restarts; record inrush current if you suspect marginal performance.
| Item | Description |
|---|---|
| Part | WR07X10055 GE Refrigerator Relay PTCR – solid‑state start device for compatible single‑phase compressors |
| Operating range | Matches refrigerator mains (typically 115-125 VAC); verify compressor nameplate for exact rating |
| Terminals | Spade terminals; confirm spacing and orientation before installation |
| Installation note | replace with OEM or electrically equivalent part; do not open sealed refrigerant circuits |
Troubleshooting and diagnostics: Testing the WR07X10055 Relay/PTCR and Isolating Circuit Faults
The WR07X10055 GE Refrigerator Relay PTCR functions as a temperature‑sensitive start device that momentarily allows higher current into the compressor start winding and then increases its resistance to remove the start circuit once the compressor is running. In practice the PTCR element shows a relatively low impedance at ambient temperature to provide starting torque, and its impedance rises rapidly when heated by current flow or an external source. This behavior replaces electromechanical start relays in many GE refrigerator models and must match the compressor’s start winding characteristics; a mismatched or failed PTCR will either prevent the compressor from getting sufficient starting current or leave the start winding coupled too long, both of which lead to humming, repeated tries to start, or overheating of the compressor motor.
Disconnect mains power before removing or bench‑testing the module. Basic diagnostics use a digital multimeter and a simple heat source: verify there is no low‑resistance short to chassis ground, measure the cold resistance across the start-related terminals (expect a low but finite ohmic reading relative to the running circuit), then apply heat (for example a hair dryer) and confirm the resistance increases; lack of resistance change, an open circuit, or a ground short indicates failure. In the appliance, isolate the relay/PTCR by measuring voltage at the compressor start terminal during a start attempt – absence of voltage with the rest of the harness intact suggests the PTCR or its connector has failed; conversely, normal start voltage but no motor spin points toward compressor winding faults or a seized motor. Practical troubleshooting also includes checking connector pins for high resistance and corrosion, swapping with a known good module when available, and comparing compressor winding resistances (run, start, common) to manufacturer references to fully isolate whether the fault resides in the WR07X10055 GE Refrigerator relay PTCR or elsewhere.
- Common symptoms: humming on startup, intermittent starts, repeated clicking, or compressor overheating.
- Speedy checks: visual inspection, continuity and ground tests, cold resistance measurement, and heat‑response test on the removed PTCR.
- In‑system checks: voltage at start terminal during crank and compressor winding resistance comparison.
| Item | Description |
|---|---|
| Cold resistance behavior | Low but measurable ohms across start terminals; provides starting current before heating. |
| Heat response | Resistance should rise noticeably when element is warmed; no change suggests failure. |
| Ground short | Any continuity from PTCR terminals to chassis ground indicates a fault; replace immediately. |
| In‑system symptom | Humming with no run indicates likely start device or start winding problem; verify PTCR first. |
Q&A
What is the WR07X10055 (PTCR) and what does it do in my GE refrigerator?
The WR07X10055 is a PTCR-type start relay (Positive Temperature Coefficient Resistor) used with the compressor’s start winding. When the compressor first tries to start it provides a low-resistance path to energize the start winding, then its resistance rises as it warms to remove the start winding from the circuit. This gives the compressor the initial torque needed to start and then allows the motor to run on the run winding only.
What symptoms indicate the PTCR relay is failing?
Common symptoms of a failing or failed PTCR relay include: the compressor humming but not starting, repeated clicking, the compressor starting intermittently, longer crank attempts, warm refrigerator with the compressor running but not cooling, or the compressor overheating and tripping protection. Sometimes the relay becomes open (no connection) or overheats and smells burnt.
How can I test the WR07X10055 safely?
First disconnect the refrigerator from power. Remove the relay from the compressor terminals.A simple safe check with a multimeter is to measure for continuity/resistance between the relay terminals - a entirely open circuit often indicates a failed unit. PTCR devices normally show low resistance when cold; however exact resistance varies by part.Avoid applying live voltage unless you are trained; live bench testing is risky and can damage the part or cause injury. If you’re unsure, have a qualified appliance technician perform the live/functional test.
Is the WR07X10055 the same as a start capacitor or overload protector?
No. The PTCR start relay is a solid-state device that temporarily engages the start winding; it is indeed not a start capacitor. The overload protector (a thermal cutout) is a separate device that protects the compressor from sustained overcurrent/overtemperature. Some compressor accessory packs contain both a relay and an overload, but they are distinct components and should not be interchanged.
Can I replace it myself and what should I watch for when installing a new WR07X10055?
Replacement is straightforward for someone cozy with basic appliance work: disconnect power, remove the old relay from the compressor terminals, fit the new unit in the same position, and secure it.Crucial precautions: always unplug power first; use the exact OEM part number or an approved equivalent; do not bypass safety devices; make solid terminal connections and avoid forcing terminals. If the compressor still won’t start after replacement, do not repeatedly try to run it-have a technician check the compressor and sealed system.
How do I confirm the replacement part is compatible with my refrigerator model?
Confirm compatibility by matching the OEM part number (WR07X10055) against your refrigerator model’s parts list or the parts seller’s compatibility table. Many online parts stores allow you to enter the refrigerator model number to find correct parts. If using an aftermarket equivalent,ensure it’s specified as a direct replacement for the WR07X10055 and rated for the same compressor type and voltage.
How long do these PTCR relays last and what causes them to fail?
PTCR relays can last several years, but lifespan varies with compressor health and environmental factors.Common causes of failure: repeated hard starts (high starting torque), compressor problems putting extra stress on the relay, overheating, moisture ingress, or general aging. If the compressor is struggling (low refrigerant, internal failure), it will stress the relay and reduce its life.
If I replace the WR07X10055 and the compressor still won’t start, what should I check next?
If a known-good relay does not solve the problem, the next checks are the overload protector (if separate), the wiring and terminal connections, and the compressor itself (locked rotor or internal failure).A sealed system issue (low refrigerant) or failed compressor motor can prevent starting even with a correct relay. At that point it’s advisable to call a qualified appliance technician, because compressor and sealed system diagnosis/repair typically require specialist tools and refrigerant handling certification.
Concluding remarks
The WR07X10055 GE Refrigerator Relay PTCR functions as a critical starting and protective component for the refrigerator compressor. As a positive temperature coefficient resistor (PTCR) type relay, it helps manage inrush current during startup, aids reliable motor engagement, and reduces the risk of overheating or repeated hard starts.Proper operation of this relay supports consistent cooling performance and contributes to compressor longevity and overall appliance efficiency.
Because the relay plays a direct role in enabling the compressor to run correctly, its performance has practical implications for system reliability, energy use, and the prevention of more extensive mechanical failures. A failing or marginal relay can lead to recurring start attempts,increased electrical stress,or premature compressor wear,any of which can result in higher repair costs and potential food spoilage if not addressed.
Given its importance, accurate diagnosis and timely replacement of the WR07X10055 GE Refrigerator Relay PTCR are advisable when relay-related issues are suspected. Proper testing-ideally by a qualified technician using appropriate diagnostic tools-will confirm whether the relay or another component is at fault. When replacement is required, using the correct part and following safe installation practices helps restore reliable operation and protects the appliance from further damage.
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