WR07X10055 GE Refrigerator Relay PTCR âŁis⤠a positiveâ temperature coefficient⤠relay⢠(PTCR) used as a solid-state start device for singleâphaseâ hermetic compressors in GE⤠refrigerators.⣠Physically it is a compactâ thermistorâstyle relay assembly that mounts at the compressor terminals or on a relay bracket and provides⤠a controlledâ change in resistance as it warms; functionally âit replaces or complements electromechanical start relays by limiting startâwinding current⢠once the compressor is running.
Inside the appliance the âŁWR07X10055 works â˘as part of the compressor â˘start âcircuit, interacting directly with the âcompressor’s start and run windings and with protective â¤devices such as the overload protector andâ the temperature/thermostat control.Atâ motor start it provides low resistance too allow current into the start winding, then its resistance risesâ with â˘temperature to remove the start winding from the circuit, â˘reducing starting âtorque demand and limiting continuous start current. Its behaviorâ therefore affects compressor⣠starting characteristics, internal motor heatingand overall refrigeration cycle stability.
in thisâ article readers will find a concise â¤technical description of the WR07X10055’s operating principle, typical applications and compatibility considerations with common GE compressor models, common failure modes and symptoms (for example hard start, continuous hummingor no start)and the diagnostic and replacement considerationsâ a technician⢠or âappliance owner should evaluate.Coverage willâ include what measurements âand âinspections are relevant,â how to verify correct part selectionand âsafety and installationâ factors to âconsider âŁwhen replacing the component.
Table⢠of Contents
- Function and Role ofâ the PTCRâ Relay in âthe Refrigerator Compressor Circuit
- How the âWR07X10055 â¤GE Refrigerator Relay PTCR Works Inside the Appliance
- Common Failure Symptoms and Electrical Diagnostic Indicators for a Faulty PTCR Relay
- Compatibility, Replacementâ Considerationsand Installation Bestâ Practices
- Q&A
- Wrapping Up
Function and Role of the PTCR Relay inâ the Refrigerator Compressor Circuit
The WR07X10055 GE Refrigerator Relay â¤PTCR is a positive-temperature-coefficient thermistor âused as âthe solid-state start â¤device in â¤many single-phase refrigerator compressor circuits. At ambient temperature âthe PTCR presents a relatively low resistance so the compressor’s auxiliary (start) winding receives the surge current required to develop starting torque; as the element heats from thatâ current its âresistance rises rapidly,⤠effectively⢠reducing start-winding current and allowing⤠the motor to run on âthe main âwinding. Because the â¤PTCR performs this timing and limiting function â¤through its resistance-temperature characteristic and thermal time constant rather than moving contacts, correct replacement requires matching the â˘original âŁdevice’s resistance curve, terminalâ configuration, âand voltage âŁrating âtoâ maintain proper starting behavior and motor protection.
- Typical failure modesâ and symptoms: compressor hums â˘but does notâ start⤠(open/high PTCR),or â˘continuous start-winding current and overheating (PTCR that fails to increase resistance).
- Practical tests: measure cold-ohm value and compare âto specification,â observe inrushâ current at startorâ substitute a verified equivalent while â˘ensuring identical mounting and âratings.
For technicians and engineers, diagnosing and replacing the PTCR âis a matter of correlating electrical measurements with observed mechanical behavior: low ambient resistance that rises into âŁthe kilo-ohm range when⣠powered indicates correct function, while a consistently high or unchanged resistance indicates a defective device. When installing a replacement such as the WR07X10055 or an⢠approved⢠equivalent,verify âŁcompatibility with the compressor model,check wiring and connector fit,and inspectâ related components (run winding integrity,start⤠capacitor where fitted,and overload protector) as a failed PTCR is frequently enoughâ a symptom of or contributor to wider start-circuit problems.
| Item | Description |
|---|---|
| Device type | PTC thermistor acting as a⢠solid-state âstart relay |
| Primary function | Provide initial âŁstart current then increase âresistance to remove start winding |
| Behavior | Low resistance at ambient; resistanceâ increases with self-heating â¤(timed cut-out) |
How the WR07X10055 GE Refrigerator Relay PTCR âŁWorksâ Inside the âAppliance
The WR07X10055 GE Refrigerator Relay PTCR is a positive â¤temperature coefficient relay used in theâ compressor â˘start circuit to provide a timed surge of current to the start winding and then⤠remove it as the compressor reaches run speed. At ambient temperature the PTCR presents â˘aâ relatively low resistance so that the start winding receives âsufficient current to develop starting torque; as current flows the device self-heats â˘and âŁits resistance rises sharply,reducing current to⣠the start winding and leaving only the run winding energized. Physically this part is a PTC thermistor element with three terminals (common, start, run) and is designed âto⢠matchâ the startingâ characteristics âŁof â¤specific GE compressor models so the compressor engages without repeated restarts or excessive inrush current.
In practice âthe WR07X10055 behaves predictably: when⤠healthy it produces a brief âhigh-start⢠current then settles to â¤a high-resistance state,â protecting the startâ winding from continuous energization. Technicians commonly observe failure âmodes such as prolonged humming, intermittent startsor no crank at all⤠when the PTCR hasâ degraded; thes symptoms differentiate PTCR failure from a failed capacitor or mechanical compressorâ fault. For replacement,verify⤠terminal configuration and OEM compatibility to ensure the thermal â˘response and resistance curve match the compressor; improper substitution can cause hard starting or excessive heat in the start circuit. Practical checks include measuring continuity and â˘noting resistance âchange as the relay warmsand confirming â¤the device is⤠not being relied on⣠to provide overload protection, âwhich âis handled by a separate component.
- Common failure signs: hard start, humming, intermittent compressor âoperation.
- Key compatibility factors: terminal layout, thermal/resistance curve,⢠and intended compressor models.
- Role inâ circuit: supply start torque briefly, then limit⣠start winding current.
| Item | Description |
|---|---|
| Function | Provides initial high current âto âstart winding, then increases resistance to remove the start circuit. |
| Behavior | Lowâ cold resistance, rapid resistance rise with âtemperature to limit current once âŁcompressorâ starts. |
| Installation | Mounted in the start âcircuit with matching terminals; must matchâ compressor startingâ specs for reliable operation. |
Common Failure Symptoms âand Electrical Diagnostic Indicators for a Faulty PTCR âRelay
The WR07X10055 GEâ Refrigerator âRelay PTCR is a solid-state start device used in many GE single-phase compressor motors to control the start winding withoutâ mechanical contacts. âAs a positive⢠temperature coefficient resistor, the PTCR presents a low resistance at ambient temperature to allowâ a high inrush â˘to the start âwinding, then heats andâ increases resistance to âŁremove the start â¤circuit once the âmotor reaches speed. Compatibility requires matching the original part’s electrical characteristics (cold resistance, operating currentand thermal âbehavior) and physical⢠mounting soâ the compressor receives⣠the correct start torque⢠and timing; substituting a PTCR with considerably different resistance or dissipation characteristics⤠can cause poor starting, excessive current draw, â˘or premature motor overheating.
Common failure modes produce characteristic âsymptoms and measurable diagnostic indicators: a PTCR that hasâ gone open or high-resistance will prevent the compressor âfrom starting and produce continuous humming⢠or repeated start attempts, while a PTCR that has failed short or stays low-resistance can leave the start winding âŁenergized and cause highâ running current or thermal trips.Technicians â˘verify faults by measuring âDC resistance and continuity of the PTCR⣠at ambient, observing the compressor’s starting current with a clamp meter (look for the expected starting spike thatâ falls off as the PTCR heats)and checking âfor abnormal voltage across the start winding duringâ the run phase. Practical on-fridge checks include â˘swapping with a known-good PTCR âor using a bench heater to confirm the device’s resistance rise⣠as it warms; protective devices suchâ as âthe compressor overload may show repeated â˘tripping if the PTCR is⤠marginal.
- Humming without compressor start – often open/high-resistance PTCR.
- Intermittent starts or long spin-up times – PTCR with slow or insufficient resistance rise.
- Continuous high current or thermal trips – PTCR stuck low/shortedâ keeping startâ winding energized.
- Burnt smell or âvisible â˘overheating near relay⢠location -⢠excessive dissipation or failed element.
| Item | Description |
|---|---|
| Typical diagnostic check | Measure cold resistance for continuity, â˘observe starting current spike with a clamp meterand verifyâ resistance increases âwith temperature. |
Compatibility, Replacement Considerationsandâ Installationâ best Practices
The WR07X10055 GE Refrigerator⤠Relay PTCR is a positive temperature coefficient relay usedâ in⢠many GE refrigerators to manage compressor starting. This deviceâ acts as a current-limiting element in the compressor start circuit: at ambient temperature it presentsâ low resistance toâ allow current into the start winding, then as current flows the element heats and its⤠resistance rises sharply, reducing start-winding current and leaving the run windingâ to sustain motor operation. Technically, the â¤PTCR replaces a mechanical âstart relay or works in parallel⣠with a start capacitor on âpermanent-split-capacitor (PSC) compressors. Compatibility âŁrequires matching the⢠PTCR’s thermal/resistive curve, terminal arrangementand physical mounting to the specific compressor and control assembly; a mismatch in PTC characteristics or terminal mapping can cause weak starts, overheatingor increased âinrush current.
Follow electrical⣠and mechanical checks during replacement: confirm compressor terminal labels (S, R, C) and âverify theâ PTCR fits theâ compressor clip or bracket without compressing the element; inspect wiring gauge and connector type to â¤ensure low contact resistance. Before powering âthe appliance,disconnect mains and discharge any start capacitors,then verify continuity and expected cold resistance âvalues with a multimeter and observe the element âwarming behavior during a controlled test run. after installation,monitor compressor start current with a âclampâ meter and listen âfor normal startâ torque and short ârun-in; repeated hard starts indicate either incorrect PTCR characteristics or an underlying compressor fault rather â¤than the ârelay alone.
- Checkâ terminal âmapping and connector typeâ for direct-fit replacement
- Verify PTCR thermal responseâ and cold⤠resistance against â˘OEM specification
- Ensure secure mounting and avoid mechanical damage or insulation compression
- Test start current and running behavior after installation
| Item | Description |
|---|---|
| Function | limits start-winding current âŁby increasing resistance as it heats, enabling safe transition to run winding |
| Terminals | interfaces with compressor S-R-C terminals; correct mapping âis required for reliable starts |
| Replacement⢠note | Match thermal/resistance curve, physical clipand connector type;â use OEM part reference where available |
Q&A
What âis the WR07X10055 (PTCR) âand what does it do in my â˘GE refrigerator?
The WR07X10055 is a PTCR (positive temperature coefficient resistor) start device used on many GE refrigerators. It provides an initial â¤boost to the compressor’s start winding and⣠then increases its resistance as it heats, effectively âremoving the start winding from the circuit once the compressor is running. It is indeed a solid-state option to an electromechanical start relay â¤and helps the compressor start reliably.
What symptoms indicate the WR07X10055 might potentially be failing?
Common⢠symptoms include: the compressor humming but not starting, repeated clicking or trying to start, long run/hard-start cycles, the refrigerator not coolingand sometimes a burning or electrical smell near the compressor. Visual signs of âfailure⢠can include melted or âburned plastic on the⢠relay, âŁcorrosionor discoloration.
How can I test the PTCR (WR07X10055) safely?
Always disconnect power before testing. Remove the relay from theâ compressor terminals and inspect it visually for damage. Using a â˘multimeter â¤set to resistance/continuity, check âfor open⣠circuits or a short âŁto ground between the device terminals and its casing. Aâ device that isâ open (no continuity where continuity is expected)â or shorted to ground is defective.As a PTCR is⣠temperature-dependent, bench âresistance readings alone are not always conclusive; if you see visible damage âor any open/short âcondition, replace it. If unsure, replace with a known good â˘unit orâ consult a âŁtechnician.
Is the WR07X10055 a direct replacement for other start relays or âŁpart numbers?
WR07X10055 is an OEM GE part used on specific models. Some aftermarket and OEM âcross-reference part numbers may be â˘compatible, but compatibility depends on compressor type and refrigeratorâ model. Always check the refrigerator’s parts list or model-specific compatibility (or⤠match the connector/terminal â¤layout and mounting) before replacing. If in doubtorder the exact part number for your appliance model or consult GE service documentation.
How do I âreplace the WR07X10055,and what safety precautions should I take?
Turn off and unplug theâ refrigerator before any work. Locate the relay on the compressor (usually on the side or base). âCarefully pull the old relay straight off the compressor terminals, noting how it â¤mounts. Plug the new PTCR onto theâ same terminals and secure any mounting clips. Restore power and observe compressor behavior. Do not attempt this work while the unit is poweredand avoid touching energized circuitry. â˘If you’re not comfortable or the compressor is in a tight space, âhire a qualified appliance technician.
After⢠replacing the âŁPTCR the compressor stillâ won’t⤠start – what should I check next?
Ifâ a new WR07X10055 doesn’t fix the problem, check the compressor and wiring: verify⢠power⣠to the compressor, inspect wiring and terminal âblock for damageand listenâ for any weak attempts â¤to start. â¤The compressor itself may have an internal⣠fault (locked rotor or failed windings) and could need replacement. A technician can measure compressor⣠resistance âvalues and locked-rotor amperage to determine if the⤠compressor is bad.
What’s the difference between a â˘PTCR and a traditional start relay/overload assembly?
A PTCR is a solid-state thermistor that changes resistance with temperature to provide a timed start boost without⣠moving parts. âŁTraditional relays use electromagnetic switching and often have an external overload⤠protector. PTCRs are compact, more resistant to mechanical wearandâ typicallyâ simpler to mount, but both types serve the same purpose: â¤help the â¤compressor start while protecting it from excessive current.
Where can I buy a genuine WR07X10055 and â˘how much â¤does it typically cost?
The WR07X10055 â˘can be⢠purchased from authorized GE parts dealers,major appliance partâ retailers,and some online marketplaces. Prices vary but typically range âfrom aroundâ $10 to â$40 depending on source âŁand whether⢠it is OEM or aftermarket. Prefer OEM or reputable aftermarket parts forâ reliable performanceand verify theâ seller’s returns policy inâ case of model mismatch.
Wrapping Up
The WR07X10055 âGE Refrigerator Relay PTCR serves⢠as a critical starting device âfor the refrigerator compressor, using âa positive temperature coefficient resistor to regulate current during motor start-up and protect the compressor from excessive starting current. Functioning properly, this component contributes to reliable cooling performance, efficient operationand â¤extended⤠service life of the refrigeration system byâ enabling the compressor to start and run âwithin designed electrical parameters.
As symptoms of a failing relay PTCR-such⤠as clicking, inability to startor intermittent cooling-can mimic other component faults, accurate diagnosis is⤠essential before replacement. Proper testing and troubleshooting, following⣠manufacturer specifications and safety âprocedures,â help confirm whether â˘the WR07X10055 relay â˘is⤠the root cause âor whether other parts (such as the start capacitor, overload protectoror compressor) require attention. âWhen replacement âŁis necessary, selecting the correct part â˘and installing it according to recommended guidelines restores reliable operation and reduces the risk of recurrent failures.
Maintaining clarity about the function and limits âof the WR07X10055 GE Refrigerator Relay PTCR supports âsound repair âŁdecisions and effective preventive maintenance. For service work beyond routine checks, consult qualified technicians andâ use compatible or manufacturer-approved parts â˘to ensure safety, warranty â˘complianceand optimal refrigerator performance over time.
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