WR09X10107 GE Refrigerator 5SP Overload/PTC is a combined overload protector and PTC (positive temperature coefficient) start device used on many GE refrigerator compressors; it is a small electrothermal/thermistor-based component that controls and protects the compressor start circuit. As a single-part solution it performs two related functions: a PTC element that provides temporary resistance change to assist starting the compressor motorand an overload element that interrupts current in the event of sustained overcurrent or excessive temperature.
Inside the appliance the WR09X10107 sits in the compressor circuit and interfaces directly with the compressor start and run windings and the incoming mains.During normal operation the PTC element briefly alters circuit impedance to favor the start winding and help develop starting torque, then its resistance rises to remove the start path; the overload element responds to elevated current or heat and opens the circuit to protect the compressor from damage. The part thus interacts with the compressor motor, relay or start relay assemblies, wiring harness, and the refrigerator’s thermal/environmental conditionsand is typically mounted on or near the compressor body for thermal coupling and easy integration into the harness.
In this article readers will find a clear clarification of how the WR09X10107 functions,what electrical and mechanical specifications determine compatibility with a given compressor,common failure symptoms (such as hard-starting or no-start conditions,continuous humming,repeated relay clicking,or an open circuit reading),practical troubleshooting tests a technician can perform (visual inspection,continuity and resistance checks,in-circuit behavior using a clamp meter and observing start attempts),and replacement considerations such as matching part numbers and electrical ratings,correct mounting and harness connections,and basic safety precautions to isolate power before servicing.
Table of Contents
- Function and Role of the WR09X10107 Start Relay and 5SP Overload/PTC in compressor Start‑Up and Motor Protection
- How the WR09X10107 GE Refrigerator 5SP Overload/PTC Works Inside the Appliance: Electrical Operation, Thermal Responseand Start‑Cycle Interaction
- Common Failure Symptoms and Measurable Electrical/Mechanical Indicators of a Faulty 5SP overload/PTC
- Compatibility, Replacement Considerations, Installation Procedures and Diagnostic Troubleshooting for WR09X10107
- Q&A
- Concluding Remarks
Function and Role of the WR09X10107 Start Relay and 5SP overload/PTC in Compressor Start‑Up and Motor protection
The WR09X10107 GE Refrigerator 5SP Overload/PTC is a combined start-assist thermistor and thermal overload protector used on single-phase hermetic compressor motors. As a PTC (positive temperature coefficient) device it presents a relatively low resistance at room temperature to feed the compressor’s start winding and provide the required starting torque; as current flows the element self-heats,its resistance rises sharply and the start current is reduced or effectively removed from the start winding. In practice this component both assists initial compressor spin-up and limits the duration and magnitude of start current, reducing stress on the motor and preventing sustained locked-rotor current that would otherwise overheat the compressor windings.
In operation the start relay or relay circuit works alongside the 5SP Overload/PTC to time and route current between run and start windings; some systems use a mechanical relay while others rely primarily on the PTC device to drop out the start winding as it heats. Fault behavior typically includes a humming compressor that will not start, repeated clickingor elevated current draw on start that then falls when the unit is allowed to cool.Technicians diagnose the part by checking cold resistance (low) versus hot resistance (much higher after a run), measuring inrush and running currentsand verifying terminal and mounting compatibility before replacement: the correct WR09X10107 replacement must match the original terminal layout and trip/heat characteristics to ensure safe, reliable start-up and motor protection.
- Common symptoms of a failing device: compressor hum without start, intermittent startsor tripped protective devices.
- Diagnostic checks: cold/hot resistance of the PTC, continuity of overloadand measured start-current profile.
- Practical replacement considerations: match part number, terminal configurationand physical mounting for correct protection behavior.
| Item | Description |
|---|---|
| Start assist (PTC) | Low initial resistance to energize the start winding; resistance rises as element heats to remove start current. |
| Overload function | Thermal cutoff behavior that opens under sustained overcurrent/overtemperature to protect compressor windings. |
How the WR09X10107 GE Refrigerator 5SP Overload/PTC Works Inside the Appliance: Electrical Operation, Thermal Responseand Start‑Cycle Interaction
The WR09X10107 GE Refrigerator 5SP Overload/PTC combines a positive‑temperature‑coefficient (PTC) start element with a thermal overload protector to control compressor start winding current and protect the motor from sustained faults. At ambient temperature the PTC presents a relatively low resistance that allows current to flow through the compressor’s start winding, producing the torque needed to accelerate the rotor. As the PTC dissipates energy it self‑heats, its resistance rises sharply and the start winding is effectively removed from the circuit; the thermal overload element opens if current or temperature exceeds safe limits. This behavior reduces inrush stress and provides short‑term start assistance while preventing prolonged overload conditions on compressors designed for the 5SP configuration, so replacement should use the WR09X10107 GE Refrigerator 5SP Overload/PTC or a direct equivalent to preserve electrical timing and terminal compatibility.
Thermally,the device operates on a time constant measured in seconds to tens of seconds: the PTC must heat quickly enough to end the start pulse after the rotor accelerates but not so slowly that the compressor sees excessive starting current. In practice, failures show up as hard starts or continuous humming when the PTC fails to provide the initial low resistanceor as no‑restart until the protector cools when the thermal element opens. Technicians commonly verify function by observing change in resistance with temperature, checking for continuity at the correct terminalsand comparing measured starting current against manufacturer specifications. In retrofit or repair scenarios, selecting a component with matching electrical characteristics and thermal trip profile is necesary to avoid nuisance tripping or inadequate starting torque.
- Common symptoms: compressor hum without start, short-run then tripor no restart until unit cools.
- Diagnostic cues: rapid resistance rise on warm PTC; elevated starting current measured with clamp meter.
- Compatibility note: use the exact part number or specified equivalent for correct terminal layout and thermal response.
| Item | Description |
|---|---|
| Function | Start‑assist via low cold resistance PTC and thermal overload protection for sustained faults |
| Electrical behavior | Low inrush path at cold start; resistance increases as device heats, removing start winding current |
| Common failure modes | Open or permanently high resistance (no start)or tripping open until cooled (overload) |
Common Failure Symptoms and Measurable Electrical/Mechanical Indicators of a Faulty 5SP Overload/PTC
WR09X10107 GE Refrigerator 5SP Overload/PTC is a combined start-protect device used on many GE refrigerator compressors to limit inrush current during starting and to open the circuit if the compressor draws excessive current or overheats. Mechanically it mounts against the compressor body and electrically provides separate start/PTC and overload conductors; the PTC element provides a temporary high resistance that drops as it heats (or vice versa depending on design) to remove/start assist from the start winding, while the overload is a temperature- or current-sensitive protector that will open if the motor is overstressed. When replacing this part, match terminal arrangement, mounting clipand electrical ratings to the compressor model rather than relying solely on case appearance, because improper substitution can result in poor starting performance or loss of thermal protection.
- No-start or long crank with humming - check for open or very high resistance between the start/PTC and common terminals and measure line voltage at the compressor during start.
- Intermittent running or frequent thermal trips – inspect for an overload that opens at near-room conditions or shows increased series resistance and use a clamp meter to observe excessive running current.
- Short to ground or blown fuses – test for continuity between each terminal and chassis; low ohms to ground indicates internal failure.
Technically verifiable indicators are continuity/resistance checks, thermal behavior under load, and current signatures during start and run. With a multimeter you can confirm continuity through the overload element when cool and verify the PTC shows a change in resistance after a short run (observe safety and isolate mains before measuring). A clamp meter during a start event will show a distinct surge for a healthy start device; a missing or reduced surge combined with stalled rotor noise often points to a failed PTC or open start circuit. For field troubleshooting, compare measurements to the compressor manufacturer’s expected behavior and replace the WR09X10107 assembly when the overload does not reset, the PTC fails to change resistance under temperatureor when start-current patterns fall outside expected norms.
| Item | Description |
|---|---|
| No-start with hum | Open or high resistance in start/PTC circuit; low or absent start-current spike on clamp meter |
| Intermittent trips | Overload opens prematurely or shows elevated series resistance; repeated thermal opens under normal load |
| Ground short or blown fuse | Continuity from terminals to chassis indicating internal short; replace unit |
Compatibility, Replacement Considerations, Installation Procedures and Diagnostic Troubleshooting for WR09X10107
The WR09X10107 GE Refrigerator 5SP Overload/PTC is a combined positive temperature coefficient (PTC) thermistor and thermal overload protector used on many GE compressors to assist motor starting and to protect the hermetic motor from sustained overload or overheating. This device is mounted to the compressor shell and wired in the start circuit; the PTC element provides a time-dependent increase in resistance once current flows, reducing start winding current after the motor starts, while the overload contact opens on sustained overcurrent or excessive case temperature. Before replacing this part, confirm the compressor model, terminal count and arrangement, and mounting clip style-substituting a protector with different thermal trip characteristics or different terminal layout can alter starting torque and may mask an underlying motor fault rather than correct it.
- symptoms indicating a failed protector: compressor hums but does not start, intermittent startsor complete no-run with normal supply voltage; burnt or discolored terminals are common physical indicators.
- Speedy checks: disconnect power, verify continuity across the protector at room temperatureand observe resistance change as the unit warms - a genuine PTC will increase resistance as it heats.
- Replacement considerations: match terminal count, mounting orientationand rated temperature/current trip characteristics; always compare the new part to the old one and the refrigerator wiring diagram.
- Post-install tests: ensure firm spade connections, restore powerand monitor compressor crank voltage and audible start behavior for several start cycles.
| Item | description |
|---|---|
| Function | Start-assist (PTC) and thermal overload protection for the compressor start circuit |
| Connector | Multiple spade terminals; verify 5-spade layout and wire positions |
| Diagnostic clue | Humming compressor with no start, intermittent startingor visible heat damage at terminals |
| Replacement check | Match part number/model, terminal arrangementand thermal trip characteristics |
Installation requires basic electrical safety procedures: disconnect power, remove the compressor access panel, document or photograph wire locationsand unclip the old protector from the compressor shell. Use a multimeter to confirm the old part’s lack of continuity or improper PTC behavior before disposal. When fitting the WR09X10107 GE Refrigerator 5SP Overload/PTC, ensure spade terminals are fully seated and that the protector sits snugly against the compressor for accurate thermal sensing; loose mounting will alter trip response. After reassembly, observe the compressor through several start cycles and check line voltage under load - persistent hard starts or excessive inrush may indicate compressor motor issues rather than the protectorand further motor or start-device testing will be required.
Q&A
What is the WR09X10107 (GE Refrigerator 5SP Overload/PTC)?
WR09X10107 is a factory replacement start component assembly used on many GE refrigerators. It combines a PTC (positive temperature coefficient) start device and an overload/thermal protector that attaches to the compressor terminals. The assembly helps provide the extra starting torque to the compressor motor and protects the motor from overheating or drawing excessive current.
What common symptoms indicate the WR09X10107 has failed?
Common signs include a compressor that hums but won’t start, frequent clicking of the relay, refrigerator not cooling, compressor that starts then quickly stopsor a warm compressor with a burnt smell. In certain specific cases the refrigerator will run intermittently or trip a home circuit breaker.
How can I safely test the WR09X10107 with a multimeter?
Unplug the refrigerator before testing. Remove the access panel and carefully disconnect the assembly from the compressor terminals (note wire positions). with an ohmmeter, check for continuity through the overload portion - an open (infinite) reading usually indicates a failed protector. For the PTC/start section you should see a low resistance when cold (exact values vary by design); if it is open or shorted the device is bad. As PTC resistance changes with temperature, compare readings to the manufacturer spec if available; or else replace if readings are outside expected ranges or if the compressor won’t start.
Can I replace just the PTC or just the overloador do I need to replace the whole WR09X10107 assembly?
Most WR09X10107 assemblies are sold and installed as a single unit. As the PTC and overload are integrated and mounted together, technicians typically replace the entire assembly rather than attempting to repair or replace individual internal components.
How do I replace the WR09X10107 – any tips for installation?
Always unplug the refrigerator first. Remove the back or bottom service panel, note or photograph terminal/wire positions, pull off the spade connectors (use insulated tools), unclip the assembly from the compressor, and install the new unit in the same orientation. Reconnect the wires to the same terminals and secure the clip. Do not overtighten terminals, ensure all spade connectors are fully seatedand restore power. If the compressor still fails to start after replacement,the compressor or start / run capacitors (if present) may be faulty and need further testing by a qualified technician.
Is WR09X10107 compatible with my refrigerator model?
WR09X10107 is a GE OEM part used on specific GE/Hotpoint/other brand models. Compatibility is determined by your refrigerator model number and the compressor type.Confirm compatibility by checking your refrigerator’s model/parts list, the part’s application listingor by providing the appliance model number to a parts supplier or technician before purchasing.
What commonly causes the WR09X10107 to fail?
Failures are typically caused by compressor overheating, frequent hard starts, electrical spikes, excessive compressor current draw, ageor contamination/corrosion at the terminals. A failing compressor (mechanical seizure or high internal pressure) can also cause the protector/PTC to burn out from repeated failed start attempts.
Can I bypass the WR09X10107 to get the compressor running?
Do not bypass the overload or PTC. Bypassing removes crucial protection and can allow uncontrolled current to damage the compressor, create a fire riskor void warranties. If you need to test the compressor quickly, a qualified technician may use safe, temporary test methods, but permanent operation must use the correct protective/start device.
Concluding Remarks
the WR09X10107 GE Refrigerator 5SP Overload/PTC serves a critical role in the refrigeration system by protecting the compressor and ensuring reliable start-up. As a combined thermal overload protector and positive temperature coefficient device, it limits current during abnormal conditions and provides the proper resistance characteristics needed for the compressor’s start winding. Proper function of this component contributes directly to compressor longevity, energy efficiencyand overall appliance reliability.
Because similar symptoms can arise from a variety of electrical and sealed-system issues, accurate diagnosis is essential before replacing the WR09X10107. Verifying the component and ruling out related parts-such as relays, wiring, or the compressor itself-helps avoid unnecessary repairs and ensures the underlying cause is corrected. When replacement is required, using a correct, spec-matched unit and following safe installation practices preserves performance and reduces the risk of repeat failure; if there is any uncertainty, engaging a qualified service technician is recommended.
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