WR07X10055 GE Refrigerator Relay PTCR is a refrigerator start relay using a positive temperature coefficient resistor element, designed to assist single‑phase compressor motors during startup. As a PTCR-type relay, it provides a low-resistance path to the compressor start winding when power is first applied, then increases resistance as it heats to remove the start winding from the circuit once the motor reaches operating speed. The component is typically a compact, solid-state module or insert that mounts on or near the compressor and often replaces older electromechanical relays in various GE and compatible refrigerator models.
Inside the appliance the WR07X10055 interacts directly with the compressor motor windings and, in many systems, with the overload protector and control circuitry. Its primary role is to create the necessary phase shift and additional starting torque for the compressor during the brief startup interval, then limit current to the start winding to prevent overheating and reduce wear. because it governs the start-up behavior of the compressor, it affects whether the refrigeration cycle can begin reliably; failures of this relay can manifest as hard starts, continuous humming, frequent tripping of protectors, or no compressor operation at all.
in this article you will find a technical overview of the WR07X10055’s operating principle and electrical characteristics, guidance on determining model compatibility and mechanical fit, common failure symptoms and diagnostic checks a technician can perform, and practical considerations for replacement and safe installation. The coverage will focus on measurable tests (resistance, continuity, in‑circuit behavior), how to interpret symptoms in the context of the wider refrigeration system, and criteria for selecting an appropriate replacement part without making unsupported claims about guaranteed outcomes.
Table of Contents
- Function and Role of the Compressor Start Relay/PTCR in Refrigerator Systems
- How the WR07X10055 GE Refrigerator Relay PTCR Operates within the Compressor Start Circuit
- Common Failure Symptoms and Electrical Indicators of a Degraded Relay/PTCR
- Compatibility, replacement Considerations and Troubleshooting Procedures for WR07X10055 and equivalent Parts
- Q&A
- In Retrospect
Function and Role of the Compressor Start Relay/PTCR in refrigerator Systems
The WR07X10055 GE Refrigerator relay PTCR serves as a self‑regulating start device for single‑phase hermetic compressor motors. As a Positive Temperature coefficient Resistor, the part presents a relatively low resistance when cold so that current flows through the compressor start winding to generate the necessary starting torque; as current heats the element its resistance rises sharply, reducing start winding current and effectively removing the start circuit from operation without a mechanical switch. This solid‑state behavior provides a simple, compact start assist that replaces or supplements electromechanical relays in many GE refrigerator models and similar compressor designs.
- Common failure symptoms: compressor hums but does not start, intermittent starts, or the relay remains hot to the touch.
- Compatibility considerations: must match the compressor terminal layout and the motor’s start‑circuit characteristics; verify part numbers and terminal positions before replacing.
- Field checks: confirm power is disconnected, inspect for burn marks or swelling, and replace rather than attempt repairs if the PTCR shows visible damage.
In practical service,technicians treat the WR07X10055 as a start‑assist component whose correct operation is judged by whether the compressor reliably comes up to speed and the start winding is removed from the circuit during run. As the PTCR’s change in resistance is temperature‑driven, bench resistance readings can be ambiguous; functional testing typically involves observing motor behavior under load or swapping with a known good unit. When replacing the device, match the electrical ratings and mounting style and ensure proper terminal connections to prevent repeated failures or abnormal compressor current draw.
| item | Description |
|---|---|
| Function | Provides temporary low resistance to energize the start winding, then increases resistance to take the start winding out of the circuit. |
| Behavior | Thermally induced rise in resistance (PTC) – low when cold, high after heating from current flow. |
| Compatibility | Must match compressor terminal configuration and motor start requirements; verify OEM part number for replacement. |
How the WR07X10055 GE Refrigerator Relay PTCR Operates Within the Compressor Start Circuit
The WR07X10055 GE Refrigerator Relay PTCR is a passive positive temperature coefficient resistor used as the start element in single‑phase compressor motors. At power‑up the device presents a relatively low resistance, allowing ample current to flow into the compressor’s start winding so the motor can develop starting torque; as current flows the element self‑heats and its resistance rises sharply, reducing start winding current and effectively taking the start circuit out of play without moving contacts. This behavior makes the component functionally equivalent to an electromechanical start relay for many GE refrigerator models while providing a solid‑state solution that eliminates mechanical wear and contact bounce, but it must be matched to the motor’s starting characteristics and supply voltage to ensure compatibility.
in operation the PTCR works with the run winding and the compressor’s internal overload to produce reliable starts and then transition to normal running. Common practical observations when a WR07X10055 fails include prolonged humming without compressor rotation,repeated attempts to start,or immediate tripping of the overload protector; technicians typically verify operation by checking continuity and cold‑state resistance,observing whether resistance increases as the unit warms,or substituting a known good relay. Because the PTCR changes resistance with temperature rather than switching, troubleshooting and replacement focus on electrical behavior and thermal condition rather than mechanical contacts.
- Feature: Low cold resistance for start torque, high hot resistance to remove start winding.
- Behavior: Self‑heating thermistor action (no mechanical contacts).
- Symptoms of failure: Humming,no start,rapid cycling,or overload trips.
| Item | Description |
|---|---|
| Function | Provides timed current to compressor start winding by raising resistance as it heats. |
| Operational characteristic | Low initial resistance → rapid rise in resistance with current/temperature. |
| Typical test | Measure cold continuity and confirm resistance increases after energizing; inspect for discoloration or cracking. |
Common Failure Symptoms and Electrical Indicators of a degraded Relay/PTCR
The WR07X10055 GE Refrigerator Relay PTCR is a positive temperature coefficient resistor used as a start device to momentarily apply the start winding of a refrigerator compressor and then raise its resistance to remove the start winding once the motor reaches speed. When the PTCR degrades it can present several electrical failure modes: an open circuit (no start current delivered), a shorted/low-resistance condition (start winding remains engaged), or a sluggish/partial resistance rise (delayed drop-out of the start winding). These failure modes directly affect compatibility and function – a degraded PTCR will produce symptoms similar to a seized compressor or faulty start capacitor and should be compared to manufacturer specifications and terminal arrangement before substituting with an alternate part number.
- Audible humming or repeated clicking at compressor start,with the compressor failing to run or taking multiple attempts to start.
- High inrush or locked-rotor current measured at startup, often tripping overload protectors or causing extended warm-up times.
- Visual signs at the relay: discolored or melted terminals, heat deformation of the housing, or burn marks indicating excessive heating.
- Multimeter indications: an open reading where continuity is expected, or an abnormally low resistance that does not rise with temperature during a run-cycle.
- Intermittent operation where the compressor starts sporadically and refrigeration performance is inconsistent.
| Item | Description |
|---|---|
| cold continuity | Expect low ohmic continuity between start and common terminals; a complete open indicates likely failure. |
| Dynamic resistance behavior | Normal PTCR resistance increases as it heats during motor start; failure modes show either no rise or permanent low/high resistance. |
| Operational symptom | Humming, high startup current, or no-start conditions map to specific electrical readings and guide replacement decisions. |
For practical troubleshooting, isolate the relay and measure cold resistance across the start-related terminals and inspect for continuity faults; follow up with a clamp meter measurement of starting amps on the compressor in a controlled test to distinguish PTCR issues from compressor mechanical faults. If bench testing shows an open or no appreciable change in resistance when the device is warmed or driven per service procedures, replacement with a correctly specified unit (matching terminal layout and voltage rating) is the appropriate remedial action. Technicians should verify the WR07X10055 GE Refrigerator Relay PTCR part number or an OEM-approved equivalent to ensure electrical compatibility and avoid mismatches that can mask underlying compressor problems.
Compatibility, Replacement Considerations and Troubleshooting Procedures for WR07X10055 and Equivalent parts
The WR07X10055 GE Refrigerator Relay PTCR is a positive-temperature-coefficient start device used to assist the compressor motor during startup by providing a low-impedance path to the start winding that increases in resistance as it heats, removing the start current once the compressor is running. This solid-state PTCR replaces electromechanical start relays in many GE models and equivalent refrigerators that use a single-phase hermetic compressor with a dedicated start winding; it is not a substitute for systems that require an external start capacitor or a diffrent type of starter.When considering compatibility, match the relay’s electrical characteristics (voltage rating, steady-state and cold resistance behavior, and current capability), terminal layout, and mounting footprint to the original part; manufacturers and aftermarket equivalents can be acceptable only if the resistance-versus-temperature curve and maximum operating current meet the compressor’s start requirements.
- Common failure symptoms: humming compressor with no start, frequent drop-out after short run, high steady-state current, or visible heat or burn marks on the relay.
- Basic in-field checks: with power removed, inspect terminals and wiring; measure continuity and cold resistance across start/run terminals; compare in-service starting current with expected values using a clamp meter.
- Replacement considerations: ensure replacement matches voltage and current ratings, physical fit, and terminal configuration; when in doubt, test with a known-good unit or obtain OEM cross-reference.
| Item | description |
|---|---|
| Type | PTCR start relay (solid-state PTC thermistor used for compressor start assist) |
| Function | Provides low resistance to energize start winding, increases resistance as it warms to remove start winding from circuit |
| typical failure signs | Compressor hums but does not start, excessive start current, intermittent starting |
| Replacement note | Match voltage and current specs and terminal layout; not suitable when a start capacitor is required |
troubleshooting should proceed with safety and methodical measurements: disconnect power, visually inspect the relay and wiring for overheating, then check cold resistance and continuity to identify open or shorted elements. In-circuit diagnostics include measuring line voltage at the compressor terminals during a start attempt-absence of expected start voltage or an abnormally high starting current suggests a failed PTCR or wiring fault; substituting a known-good WR07X10055 or equivalent relay is a practical confirmation step when available. If replacement is required, document the compressor model and the existing relay’s electrical markings to select a part with compatible thermal response and current handling, and verify operation under load after installation to confirm the issue has been resolved.
Q&A
What is the WR07X10055 (PTCR) used in GE refrigerators?
The WR07X10055 is a PTCR (positive temperature coefficient resistor) start device used on many GE refrigerators. It acts as the compressor start relay by supplying current to the compressor’s start winding when the compressor first tries to run, then increasing its resistance as it warms to remove the start winding from the circuit once the compressor is up to speed.
What symptoms suggest the WR07X10055 has failed?
Common symptoms of a failing PTCR start device include a refrigerator that is not cooling, a loud humming or clicking at the back (compressor trying to start), long or frequent start attempts, tripped breakers, or the compressor running but struggling to reach and hold normal temperature.You may also notice a burned smell or visible heat damage at the relay.
How can I safely test the WR07X10055 at home?
Always unplug the refrigerator before testing. Remove the relay from the compressor area and inspect for physical damage or burn marks. With a multimeter you can check for open circuits (an open PTCR is usually bad). PTCR devices don’t give a definitive numeric resistance like fixed resistors,so a simple open/short test plus visual inspection is frequently enough used. Avoid prolonged “jumper” tests with power applied-these can damage the compressor. If in doubt, replace the PTCR rather than rely on ambiguous meter readings.
Is the WR07X10055 the same as the overload or do I need both parts?
They are different components. The WR07X10055 is a PTCR start device; the overload is a separate protective device that prevents compressor overheating. Some refrigerators use a combined start-relay/overload assembly,but many GE models use the PTCR start device plus a separate overload. Check your model’s parts diagram to confirm whether both are required and if they are integrated or separate.
Can I replace the WR07X10055 myself, and what is the procedure?
Yes, a competent DIYer can replace it. Steps: unplug the fridge, move it away from the wall, access the compressor area (rear lower panel), remove the old relay by unplugging connectors and any mounting clips, install the new relay in the same orientation, reconnect connectors, reattach panels, and power the unit back on. Always confirm the replacement part number matches and follow safety precautions-if you’re uncomfortable working near the compressor or wiring,hire a technician.
Are there compatible or aftermarket replacements for WR07X10055?
There are OEM WR07X10055 parts and aftermarket equivalents. When replacing, use the exact part number or a confirmed cross-reference for your refrigerator model. Using an incompatible start device can cause poor starting performance or compressor damage. If unsure, buy the OEM part or consult the appliance’s parts list or a technician for the correct cross-reference.
How long does replacing the WR07X10055 take and what does it cost?
Replacement is usually quick-about 15 to 45 minutes for a trained DIYer or technician. The part itself is generally inexpensive (typically in the low tens of dollars),though prices vary by supplier. Labor costs will vary if you hire someone to do the work.
What are the risks of running a refrigerator with a failing or missing PTCR start device?
Running a refrigerator without a functioning start device can cause the compressor to repeatedly fail to start or to draw excessive current, wich can overheat and damage the compressor motor windings, trip breakers, or shorten compressor life. Replace a suspected bad PTCR promptly to avoid more costly compressor failure.
In Retrospect
The WR07X10055 GE Refrigerator Relay PTCR plays a focused but critical role in refrigerator operation by enabling reliable compressor startup and helping manage inrush current during motor spin-up. As it effectively works at the interface between the start and run phases of the compressor, its proper function supports overall cooling performance, energy efficiency and protects the compressor from abnormal electrical stresses that can shorten component life.
Accurate diagnosis and timely replacement of a failing WR07X10055 are crucial to restore normal operation and to avoid misdirected repairs. Symptoms such as a compressor that will not start, repeated clicking, or intermittent cooling should be evaluated to confirm that the PTCR relay is the root cause rather than a separate issue with the compressor, wiring or control circuitry. Replacing the relay with the correct part or an approved equivalent and following manufacturer guidelines helps ensure a safe, durable repair and can prevent additional appliance damage.
Maintaining awareness of the relay’s condition and addressing identified failures promptly reduces downtime and long-term service costs. when in doubt,relying on qualified diagnostic and service resources will yield the most reliable outcome and protect both appliance performance and warranty considerations.
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