WR07X10055 GE Refrigerator Relay PTCR is a Positive Temperature Coefficient Relay (PTCR) used as a compressor start device in many GE refrigerators. It is indeed a thermistor-based start relay that provides a high starting current to the compressor start winding and then increases in resistance as it heats, effectively removing the start circuit once the compressor is running. As a solid-state option to electromechanical start relays, the PTCR combines simple thermal behavior with compact packaging suited to refrigerator service environments.
Inside the appliance the PTCR is part of the compressor starting circuit and works directly with the compressor windings, the overload protector, and the line supply. When the refrigerator calls for cooling the PTCR presents low resistance to energize the start winding and create the torque needed for initial rotation; once the compressor reaches speed the device’s resistance rises and reduces current to the start winding so the compressor transitions to run mode. It therefore interfaces electrically with the compressor terminals (start, run, common) and mechanically is typically mounted on or near the compressor body or on its mounting bracket to allow proper thermal behavior.
This article will explain the PTCR’s operating principle, where and how WR07X10055 is used, and how to verify compatibility when sourcing a replacement. You will also find common failure symptoms (hard starting, continuous humming, high current draw, or no-run conditions), practical troubleshooting checks a technician can perform with basic tools (visual inspection, continuity/resistance checks, and live-voltage observations), and considerations for safe, correct replacement and installation. Emphasis will be on factual diagnostic steps, electrical characteristics to compare when selecting a substitute part, and installation practices that preserve reliable compressor starting.
Table of Contents
- Function and Role of the Refrigerator Start Relay and PTCR in Compressor Start Circuits
- How the WR07X10055 GE Refrigerator Relay PTCR Operates Within the Compressor Start Assembly
- Common Failure Symptoms and Electrical Signatures of a Faulty Relay/PTCR
- Replacement Considerations and Step-by-Step Installation for WR07X10055-Equipped Models
- Q&A
- In Retrospect
Function and Role of the Refrigerator Start Relay and PTCR in Compressor start Circuits
The WR07X10055 GE Refrigerator Relay PTCR functions as the start assist device in many single‑phase refrigerator compressors by temporarily directing current into the compressor’s start winding during spin‑up. As a PTCR (positive temperature coefficient resistor) it presents a relatively low resistance when cold to allow the large starting current needed for torque; as current flows the PTCR element self‑heats and its resistance rises sharply, effectively removing the start winding from the circuit once the rotor approaches running speed. In practical systems this solid‑state start relay replaces or complements electromechanical relays and start capacitors, providing a compact, low‑maintenance means of limiting start duration and reducing arcing and contact wear common to mechanical relays.
Technicians should match replacement WR07X10055 GE Refrigerator Relay PTCR units to the compressor’s electrical specs and terminal layout; differences in cold resistance, thermal time constant, or voltage rating can prevent reliable starts or cause nuisance failures. Common field symptoms of a failing PTCR include sustained compressor humming with no start, intermittent starts, tripped breakers, or a visibly overheated relay housing; diagnostic checks include cold resistance/continuity measurements, monitoring amp draw during a start attempt, and swap testing with a known good unit. For safe installation, place the PTCR where it will see normal operating temperatures (typically near the compressor) and ensure mounting and insulation meet the appliance manufacturer’s recommendations.
- Key features and symptoms: solid‑state start assist, automatic resistance rise with temperature, reduced mechanical wear, failure modes include open circuit, excessive leakage, overheating, and intermittent conductivity.
| Item | Description |
|---|---|
| Function | Provide initial current to the start winding then increase resistance to remove start winding from circuit |
| Type | PTCR (positive temperature coefficient resistor) start relay |
| Typical behavior | Low cold resistance → high resistance after self‑heating to limit start duration |
| Common failure modes | Open or intermittent element,thermal degradation,elevated leakage causing weak starts |
How the WR07X10055 GE Refrigerator Relay PTCR Operates Within the Compressor Start Assembly
The WR07X10055 GE Refrigerator Relay PTCR functions as a temperature-dependent series element in the compressor start circuit. At ambient temperature its low resistance permits a high starting current to flow into the compressor’s start winding,providing the additional torque needed for rotor acceleration. As current flows the PTCR self-heats and its resistance increases rapidly, effectively removing the start winding from the circuit without mechanical contacts. In many GE compressor start assemblies this PTCR is mounted at the compressor terminal cluster and wired between the line and start terminals so the part must match the compressor’s electrical and thermal characteristics for correct timing of the start-to-run transition.
In practical service, the PTCR’s behavior determines both starting performance and a common set of fault symptoms: a sufficient low initial resistance gives reliable starts, while a too-slow resistance rise or an open/shorted device will cause repeated hard starts, humming, high locked-rotor current, or thermal overload trips.Technicians verify function by measuring cold resistance and observing that resistance increases under applied voltage (taking appropriate safety precautions), and by replacing with an OEM-equivalent that matches the voltage and transition temperature. using an incorrect PTCR can produce marginal starts or continuous start-winding current, accelerating compressor wear; therefore replacements should match the original WR07X10055 electrical and thermal profile or be approved equivalents.
- Function: provides initial low resistance for starting, then increases resistance to remove start winding.
- Electrical behavior: self-heating positive temperature coefficient-no moving parts or contacts.
- Common symptoms of failure: no-start/humming, frequent overload trips, or continuous run with elevated current.
- Compatibility note: must match line voltage and transition characteristics of the compressor start assembly.
| Item | Description |
|---|---|
| Part | WR07X10055 PTCR relay used in GE refrigerator compressor start circuits |
| Function | Provides timed reduction of start winding current via positive temperature coefficient behavior |
| Typical supply | Domestic systems: ~115-125 VAC line (use OEM spec for exact request) |
| Failure symptoms | Humming, failure-to-start, high locked-rotor current, repeated overload trips |
Common Failure Symptoms and Electrical Signatures of a Faulty Relay/PTCR
The WR07X10055 GE refrigerator Relay PTCR is a positive temperature coefficient resistor used as a start relay for many GE compressor motors; it provides a low-impedance path to the compressor’s start winding during initial energization and then increases its resistance as it heats, effectively removing the start winding from the circuit. In practice this component must match the compressor’s electrical characteristics and terminal layout for proper compatibility-an or else identical-looking part can still fail to start the motor if its cold-to-hot resistance curve or thermal time constant differs significantly. Technicians should verify terminal arrangement and mounting before replacement and always de-energize the appliance when removing or installing the relay/PTCR.
Common failure symptoms are mechanical (frequent clicking, intermittent starts) and electrical (no continuity, sustained high inrush or no inrush at all). Electrical signatures useful for diagnosis include a low cold resistance reading that fails to rise as the device warms, an absence of the expected brief current spike into the start winding on power-up, or an open circuit indicating a failed element.Visual signs such as heat discoloration or a burnt odor often accompany an electrical failure. Practical troubleshooting steps include checking continuity at the relay/PTCR, measuring voltage at the compressor start terminal during attempted starts, and observing current behavior with an ammeter; these checks distinguish a failed PTCR from a failed start capacitor, start winding, or other control component.
- Repeated clicking on start,compressor not staying engaged
- No cold continuity or a shorted reading on the PTCR
- Normal run voltage present but no start winding current spike
- Heat discoloration,deformation,or burnt smell at the relay/PTCR
| Item | description |
|---|---|
| cold resistance | Should show low ohmic continuity before heating; an open or very high reading indicates failure |
| Hot resistance/behavior | Resistance should increase as the unit warms and remove the start winding; lack of increase means it will not drop out correctly |
| Startup current signature | Brief inrush into the start winding followed by a fall to run current; absence or prolonged high inrush points to a fault |
Replacement Considerations and Step-by-Step Installation for WR07X10055-Equipped Models
The WR07X10055 GE Refrigerator Relay PTCR functions as the compressor start device by presenting a low resistance path to the start winding during initial energization and then increasing its resistance as it heats to remove the start winding from the circuit. This PTC-based relay does not use a mechanical timing mechanism; instead the thermistor characteristic times out the start interval.Technically, a failing WR07X10055 will show either a short or an open/very high cold resistance, produce repeated compressor hums, high inrush current, or failure to start.Replacement must match the original part’s terminal layout and electrical characteristics to preserve the designed start profile and avoid excessive start current or premature compressor stress.
Perform replacement with standard appliance-service precautions: disconnect power, verify no voltage at the refrigerator, and isolate the compressor area. Remove the access cover, note and photograph the wiring and terminal positions, then transfer or replace the relay ensuring spade connectors seat fully and the rubber grommet or bracket that isolates the relay from vibration is restored. After fitting the WR07X10055, check basic electricals with a multimeter (run-winding continuity, no shorts to ground) and a clamp meter to confirm starting and running currents fall within expected ranges; if abnormal currents or failure-to-start symptoms persist, inspect the overload protector and sealed system before replacing additional components.
- Disconnect power and allow capacitors (if present) to discharge.
- Remove rear access panel to expose the compressor terminals and relay assembly.
- Document wiring orientation, then disconnect spade terminals and remove the old relay and grommet/bracket.
- Install the WR07X10055 with the correct terminal mapping, secure grommet/bracket, and restore any shielding or covers.
- Reapply power and verify compressor starts; measure start and run currents and inspect for abnormal heat or vibration.
| Item | Description |
|---|---|
| Part number | WR07X10055 – PTCR start relay used on select GE refrigerator compressors |
| Function | Provides timed start winding engagement using PTC heating to transition to run winding |
| Typical location | Mounted near compressor terminal cluster behind the access panel, frequently enough isolated by a rubber grommet |
| Service note | Disconnect power and document terminal positions before removal; verify start/run currents after replacement |
Q&A
What is the WR07X10055 PTCR relay and what does it do in a GE refrigerator?
WR07X10055 is a GE OEM PTCR (positive temperature coefficient resistor) start device used in the compressor start circuit. It provides an initial boost to the compressor start winding when power is applied, then its resistance rises as it heats so the start winding is removed from the circuit once the compressor is running.
How can I tell if the WR07X10055 relay is failing?
Common symptoms include the compressor not starting or struggling to start (loud humming or clicking),the refrigerator not cooling,intermittent running,or a relay that appears burnt,cracked,or discolored. A failed PTCR may allow the compressor to try to run but not achieve full speed, or it may prevent starting altogether.
How do I safely test a WR07X10055 PTCR relay?
Always disconnect power before inspecting or removing the part. Visually check for damage, then use a multimeter to check for continuity between appropriate terminals and to confirm the part is not open-circuit. As PTCR devices change resistance with temperature, a simple cold resistance reading only tells if the device is open. If you need a definitive diagnosis, compare readings to the manufacturer’s specs or replace with a known-good unit. If you’re unsure, have a qualified technician test it.
Is the WR07X10055 the same as a start relay or overload protector?
WR07X10055 is a PTCR start device (a solid-state start relay). It is indeed not the same as a thermal overload protector, even though both are part of the compressor start system. The overload protects the compressor from overheating and excessive current; the PTCR provides the starting boost and then drops out.Some systems use combined modules, so check your model’s configuration.
Wich GE refrigerator models use WR07X10055,and how do I confirm compatibility?
WR07X10055 is used on a variety of GE/Hotpoint/Haier-built refrigerators. To confirm compatibility, check the part number on the existing relay, consult your refrigerator’s parts diagram or owner manual, or enter your appliance model number on GE Parts or authorized parts suppliers to cross-reference the correct part.
Can I replace the WR07X10055 myself, and what should I be careful about?
Technically a competent DIYer can replace it: disconnect power, access the compressor compartment (usually at the back/bottom), remove the old PTCR from its mounting or compressor terminal, install the new unit in the same orientation and secure any clips or housing, then restore power and test. Be careful to fully disconnect power first, avoid bending compressor terminals, and ensure wiring or connectors are reattached correctly. If you’re not comfortable with electrical components or working near the compressor, hire a technician.
How much does a WR07X10055 cost and where can I buy one?
Retail prices vary but many OEM WR07X10055 PTCR relays sell in a low-cost range (typically around $10-$40 USD).Purchase from authorized GE Parts, reputable appliance parts retailers, or well-rated online sellers to ensure you get an OEM or correct replacement. Avoid cheap unknown clones that may fail prematurely.
How long should the WR07X10055 last and are there ways to prevent premature failure?
Lifespan varies with use and environmental factors (heat, vibration, voltage spikes). Many last for several years; failure can be accelerated by repeated hard starts, high ambient temperatures, or electrical problems. Preventive measures include ensuring proper refrigerator ventilation, stable household voltage (surge protection if your area has spikes), and prompt repair of compressor or sealed-system issues that cause hard starting.
In Retrospect
The WR07X10055 GE refrigerator PTCR relay plays a central role in the compressor start sequence by enabling reliable motor startup and helping protect the system from excessive current during operation. As a small but critical component, its proper function contributes directly to efficient cooling performance, consistent temperature control, and the long-term health of the compressor; failure or degradation of the relay is commonly associated with hard starts, intermittent operation, higher energy draw, and potential compressor stress.
Because symptoms of a failing PTCR relay can resemble other refrigeration issues, accurate diagnosis is essential to avoid unnecessary parts replacement and to address the root cause promptly. When replacement is required, choosing the correct replacement part and following established service procedures-ideally performed by a qualified technician-helps restore reliable operation and minimize further component damage. Thoughtful diagnosis and timely, appropriate replacement preserve system efficiency and extend the service life of the refrigerator.
Professional Appliance Service
If your appliance requires professional diagnosis or repair, visit
Revolff Home Services
for expert appliance repair services.
For local appliance service information see
Dryer repair Henderson
.
Replacement parts for many appliance models can also be found at
Reliable-Parts-Hub
.
Recommended Products
The Blincoo Elite 48" Heavy Duty Dog Rope Toy is made for large breeds that love tug-of-war, chewing, and active play. Strong, simple, and fun for powerful dogs.
Shop on TikTok