WR07X10055 GE Refrigerator Relay PTCR is a Positive Temperature Coefficient Resistor used as a solid‑state start relay in GE refrigerators. As a PTCR device, it provides a low initial impedance to feed the compressor start winding and then increases resistance as it warms, effectively removing the start circuit once the compressor reaches running speed. The part is a compact, passive component designed to replace or supplement electromechanical start relays in single‑phase hermetic compressor systems.
Inside the appliance, the PTCR works directly with the compressor motor’s start and run windings and is typically mounted adjacent to the compressor or inside the evaporator compartment access area. It interacts electrically with the compressor,the line supply,and protective devices such as the overload protector; it does not provide timing or logic control but performs a temperature‑dependent switching function that limits start winding current after startup. proper operation of the PTCR is critical to ensure reliable compressor starting, limit inrush current, and prevent overheating or premature failure of the start winding.
In this article readers will find a technical explanation of how the WR07X10055 PTCR functions, guidance on model compatibility and where the part is typically installed, common failure symptoms (for example hard starts, humming, or repeated overload trips), step‑by‑step troubleshooting checks and diagnostic measurements to perform, and practical replacement considerations including mounting, electrical testing, and safety precautions. The goal is to give technicians, engineers, and informed appliance owners the context and procedures needed to diagnose and replace this component correctly.
Table of Contents
- Function and Role of the PTCR Start Relay in the Refrigerator Compressor Circuit
- How the WR07X10055 GE Refrigerator Relay PTCR Operates Within the Compressor Start/Run Circuit
- Common Failure Symptoms and Electrical Indicators of a Faulty PTCR Relay
- Compatibility, Replacement Considerations, and Step‑by‑Step Installation for WR07X10055 and Equivalent Relays
- Q&A
- To Conclude
Function and Role of the PTCR Start relay in the Refrigerator Compressor Circuit
The WR07X10055 GE Refrigerator relay PTCR is a positive temperature coefficient resistor used as the start relay in single‑phase refrigerator compressor circuits. As a thermistor-based device it presents a low resistance when cold to supply current to the compressor’s start winding, then self-heats during operation so its resistance rises sharply and effectively removes the start winding from the circuit. Because the device has no moving contacts, it provides a simple, passive timing and current‑limiting function: it allows the high starting torque required for motor pickup and then reduces start‑winding current to prevent overheating and excessive inrush during normal run conditions.
Technicians should view the PTCR as both a timing element and a protection aid specific to compressors that use a start winding rather of a seperate start capacitor or electromechanical relay. WR07X10055 units are matched to particular compressor terminal arrangements and thermal/current characteristics, so replacements should match the original part number and terminal layout. Common diagnostic signs of PTCR failure include prolonged humming at startup, inability of the compressor to kick in, or tripping of overcurrent protection; bench checks include cold continuity and observing the expected resistance rise under controlled heating.Replace the PTCR if it fails continuity checks or does not exhibit a resistance increase when warmed, and always verify the compressor and overload device are functioning as part of a complete startup‑circuit diagnosis.
- Passive thermistor action: low cold resistance → high hot resistance
- Symptoms of failure: no start, prolonged hum, repeated attempts to start, tripped breaker
- Practical check: cold continuity test and resistance rise with applied heat (controlled)
- Compatibility: match WR07X10055 specifications and terminal layout to the compressor
| Item | Description |
|---|---|
| Function | Provides initial current to start winding then increases resistance to remove it from circuit |
| Behaviour | Low cold resistance; self‑heats under current and increases resistance to limit start current |
| Typical failure modes | Open circuit, stuck low resistance, or insufficient resistance rise causing start problems |
| Compatibility note | Must match compressor terminal layout and thermal/current characteristics; use same part number where specified |
How the WR07X10055 GE Refrigerator Relay PTCR Operates Within the Compressor Start/Run Circuit
The WR07X10055 GE Refrigerator Relay PTCR is a Positive Temperature Coefficient resistor used as a start assist device in the compressor start/run circuit. at ambient temperature the PTCR presents a relatively low resistance so the compressor start winding receives the extra current and torque required to spin up from standstill.As current flows through the PTCR during startup it self-heats; its resistance rises rapidly, effectively removing the start winding from the circuit and leaving only the run winding energized. This thermal-resistance behavior replaces a mechanical start relay or centrifugal switch and provides a timed transition between start and run modes without moving parts.
In practical terms, the PTCR affects starting torque, inrush current, and restart behavior: a correctly specified WR07X10055 will allow reliable starts and fast reuse after a power interruption, while a mismatched unit can cause hard starting, excessive heating, or premature cycling. Technicians troubleshoot PTCR faults by observing compressor hum without rotation, frequent failure to start, or erratic restarts; replacing the PTCR with a part that matches the original terminal layout and resistance/temperature curve is necessary for compatibility with the compressor. common symptoms and a short technical reference are shown below to aid diagnosis and part selection.
- Common symptoms of PTCR failure: compressor hum with no start, slow starts, repeated start attempts, and elevated motor temperature.
- Behavioral feature: low initial resistance for start, high resistance after heating to remove start winding.
- Compatibility consideration: match terminal configuration and the PTCR’s resistance/temperature profile to the compressor model.
| Item | Description |
|---|---|
| Function | Provides timed start assistance by increasing resistance as it self-heats, removing the start winding from the circuit. |
| Behavior | Low cold resistance to pass start current; high hot resistance to isolate the start winding. |
| compatibility | Intended for GE compressor circuits that require a PTCR start relay; replacement requires matching terminals and resistance/temperature characteristics. |
Common failure Symptoms and Electrical Indicators of a Faulty PTCR Relay
The WR07X10055 GE Refrigerator Relay PTCR is a positive temperature coefficient relay used as a start device for single‑phase refrigerator compressors. Functionally it presents a relatively low resistance path to the start winding at ambient temperature to provide the start torque, then its resistance rises rapidly as it heats, removing the start winding from the circuit once the motor is running. In field practice this behavior is sensitive to correct part selection and mechanical fit: the relay must match the compressor’s start/run terminal arrangement and thermal characteristics to avoid prolonged high inrush current, weak starts, or overheating that can trip the compressor overload.
- Compressor hums but does not start or starts intermittently.
- Repeated clicks of the overload protector with no compressor run.
- High sustained inrush current measured at the line during attempted starts.
- Open circuit or no measurable change in resistance when the PTCR is warmed (no thermal response).
- Visible overheating, discoloration, or burn marks on the relay housing or terminals.
| Item | Description |
|---|---|
| Cold resistance behavior | Low resistance path to start winding at room temperature; should show continuity on a multimeter. |
| thermal response | Resistance increases as the element warms; lack of change indicates internal failure. |
| Inrush current | A brief high starting current pulse is normal; a sustained high draw suggests the PTCR did not reduce start winding current. |
Technicians verify a failing PTCR by combining visual inspection with basic electrical checks: confirm continuity across the relay at ambient temperature, then apply heat (such as with a heat gun at low setting) to confirm the resistance rises rather than staying constant. Use a clamp meter to observe the compressor’s starting current – a functional PTCR produces a sharp inrush that drops quickly as the start winding is removed; if current remains high or the start attempt repeats, the relay or the associated compressor start components are suspect. Replace with a correct‑matching WR07X10055 or equivalent specified for the model to restore proper start behavior and avoid collateral overload trips.
Compatibility, Replacement Considerations, and Step‑by‑Step Installation for WR07X10055 and Equivalent Relays
The refrigerator start device designated WR07X10055 GE Refrigerator Relay PTCR is a PTCR (positive temperature coefficient resistor) start relay used to momentarily energize the compressor’s start winding.When cold the PTCR presents low resistance and permits current to the start coil; as current flows it self-heats, the resistance rises sharply and the start circuit is effectively removed so the motor can run on its main winding. Compatibility with other relays depends on matching the electrical characteristics (cold and hot resistance curve, rated voltage, and allowed inrush/current), the physical mounting and terminal layout, and whether the overload/protector is integrated or separate.Using a relay with incorrect resistance or timing characteristics can cause weak starts,repeated cycling,or excessive compressor heating; conversely,a correctly matched aftermarket or equivalent relay that meets the same specifications will function like the OEM part without altering compressor protection behavior.
Before replacing the relay verify model markings, measure continuity of start and run windings if possible, and confirm whether the overload protector must be replaced at the same time. practical replacement steps include isolating power, accessing the compressor terminal cover, documenting terminal positions, and swapping components without disturbing the sealed refrigerant system. After installing the new relay, restore power and observe that the compressor starts promptly and that steady-state running current is within expected limits; if the compressor struggles to start or draws excessive current, shut down and re-check terminal connections and component compatibility.
- Power off and unplug appliance before accessing compressor terminals.
- Label or photograph wire positions to ensure correct reconnection (S, R, C or start/run markings).
- Replace both relay and any separate overload/protector if signs of heat damage or corrosion are present.
- After installation, test for normal start behavior and measure current to confirm proper operation.
| Item | Description |
|---|---|
| Part | WR07X10055 GE Refrigerator Relay PTCR – PTCR start relay for single‑phase compressor start winding |
| Typical ratings | Line voltage (120 V typical), designed to handle compressor start inrush; matches OEM resistance curve |
| Key checks | Physical fit, terminal layout, integrated vs separate overload, and measured start/run winding continuity |
Q&A
What is the WR07X10055 (PTCR) relay and what does it do in my GE refrigerator?
The WR07X10055 is a GE OEM PTCR (Positive Temperature Coefficient Resistor) start device used with the compressor. It helps provide the initial start current to the compressor motor’s start winding and then reduces that start current as it heats up. In short, it acts as an electronic “start relay” to get the compressor running and then limits/start winding current once the motor is up to speed.
What symptoms indicate the WR07X10055 is failing?
Common signs include: compressor humming but not starting, frequent clicking or short attempts to start, refrigerator not cooling while lights/fans still work, or the compressor starting intermittently. If the PTCR is open, shorted, or no longer changes resistance with temperature, the compressor will frequently enough fail to start.
How can I test the WR07X10055 to see if it is bad?
First unplug the refrigerator. Remove the relay from the compressor terminals and inspect for burn marks or damage. With a multimeter set to ohms, check for continuity across the relay terminals-an open circuit indicates failure. for a PTCR specifically, it should show relatively low resistance cold and a marked increase in resistance when heated (you can carefully warm it with a heat source briefly to confirm the change). If it is open, shorted to ground, or does not change resistance when warmed, replace it. If unsure, compare readings to the new part or consult a tech.
How do I replace the WR07X10055 PTCR relay?
Safety first: unplug the appliance. Access the compressor (usually via the rear lower panel). Carefully pull the old relay straight off the compressor terminal block and disconnect any connectors. Install the new WR07X10055 in the same orientation,reconnect wires,replace the access panel,and restore power. Do not force connectors or work on the sealed refrigerant system; if the compressor still does not run after replacing the relay, contact a qualified appliance technician.
Can I temporarily bypass the relay to get the compressor running?
Bypassing a start device is not recommended. Using jumpers or incorrect methods can damage the compressor motor, the refrigerator, or create a safety hazard. if you need to test whether the compressor will run, it’s safer to replace the relay with a correct replacement or have a trained technician test the compressor with appropriate equipment.
Is the WR07X10055 compatible with my GE refrigerator model?
WR07X10055 is an OEM part used on many GE refrigerators, but compatibility depends on the specific model and compressor type. Always verify compatibility using yoru refrigerator model number or by checking parts look-up on GE/Haier (GE Appliances) websites or authorized parts suppliers. Do not rely solely on visual similarity-match the part number.
What is the difference between a PTCR starter like WR07X10055 and a conventional start relay/overload?
A PTCR starter is a thermistor-based device that starts the compressor by offering low resistance when cold and then increases resistance as it heats, reducing start current. Conventional mechanical start relays switch the start winding on briefly and typically use an overload protector separately. PTCR starters are compact, have no moving parts, and are used in many modern compressors, while other systems may use separate electromechanical relays and start capacitors.
If replacing the WR07X10055 doesn’t fix the problem, what should I check next?
If a known-good WR07X10055 doesn’t restore compressor operation, check the compressor electrical characteristics (proper line voltage at the compressor, continuity between compressor terminals, and no short to ground). Also inspect the overload protector if separate, wiring harnesses, and the start device connections. Persistent failure may indicate a locked or failed compressor or a sealed-system problem-these require a certified appliance/refrigeration technician.
To Conclude
The WR07X10055 GE refrigerator relay PTCR is a critical component in the compressor start circuit, designed to help the compressor start reliably and to protect the motor from excessive current during startup. Its positive temperature coefficient behavior and tailored specifications for GE systems make it key to consistent cooling performance, efficiency, and long-term appliance reliability.
Accurate diagnosis and,when necessary,timely replacement of the WR07X10055 are essential to maintaining refrigerator operation and avoiding collateral damage to the compressor and other components. Proper evaluation-conducted with the correct test methods and reference to manufacturer specifications-ensures that service decisions are based on the actual condition of the part rather than symptoms alone.
When replacement is required, using the correct WR07X10055 part or an approved equivalent and following appropriate installation and safety practices preserves performance and minimizes the risk of future failures. Attentive maintenance, professional diagnosis, and correct replacement support safe, efficient, and dependable refrigerator operation over the appliance’s service life.
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