WR07X10055 GE Refrigerator Relay PTCR â¤is a positive temperatureâ coefficient (PTC)⤠start⢠relay â¤designed for use in singleâphase refrigeration compressor start âcircuits. As a temperatureâsensitive resistive ârelay, the PTCR provides a temporary lowâimpedance path to the compressor’s âstart winding during â¤motor startup and then increases âresistance as it heats to remove the start winding from the circuit.The⢠component is typically a âŁcompact, selfâcontained â˘device that replaces or complements customary â¤electromechanical start ârelays in certain â¤GE ârefrigerator â¤models and comparable appliances.
Inside the appliance âŁthe relayâ works asâ part of the compressor starting system and âinteracts directly⤠with⤠the â˘compressor’s start and run windings, the overload â¤protector,â and âthe control/thermostat â¤circuitry. During motor start âŁit supplies higher current to the startâ winding to⢠generate necessary starting torque; once the motor reaches nearârunning â˘speed theâ PTCR element heats andâ its resistance rises, reducing current flowâ to preventâ continued engagement of the start winding.â Because it is inâ the power pathâ to the compressor, its âcondition affects compressor startingâ behaviour, inrush current,⣠and overall cooling performance.
In this article readers will find a technical explanation of the âWR07X10055⢠PTCR’s operating âprinciple and electrical behavior, guidance on âmodel compatibility âŁand â˘how⢠it is integrated in the⣠start⢠circuit, common failure symptoms toâ recognize â(for example humming, failure to start, excessive runâ timeor visible overheating), basic diagnostic approaches a technician can use âŁto isolate relay problemsand practical considerations for replacement and selection⣠of equivalent â¤parts. The⢠content aims âto provide the technical contextâ needed by âŁtechnicians, âengineersand appliance owners to âunderstand, troubleshoot, â¤and make informed decisions about this âŁcomponent without â˘prescribing âŁdetailed repair procedures.
Table of Contents
- Function and Role of the Start⢠Relay PTCR in Refrigerator Compressor âOperation
- How⢠the WR07X10055 GE Refrigerator Relay PTCR works Inside the Appliance: Circuit âIntegration and Electrical Characteristics
- Commonâ Failure Symptoms⤠and Diagnostic Indicators of a Failing Start Relay âPTCR
- Troubleshooting, Diagnostics, Compatibilityand Replacement Considerations for WR07X10055⢠GE Refrigerator Relay PTCR
- Q&A
- Closing Remarks
Function and Role of the Start â˘Relay âPTCR in Refrigerator Compressor Operation
The WR07X10055 GE Refrigerator Relay âŁPTCR is â¤a positive temperature coefficient resistorâ used as aâ start relay in singleâphase refrigerator compressors. At ambient âtemperature the PTCR exhibits â˘relatively low resistance, allowing current to⣠flow thru the compressor’s start windingâ and generate âŁthe âadditional starting torque required to âbring⤠the motor up to speed. As current flows through the element it selfâheats; itsâ resistance rises quickly,â reducing start winding current and effectively removing the start circuit from⤠operation without moving parts. This behavior provides a â˘compact, solidâstate means to limit inrush, prevent prolonged start winding energizationand coordinate with the compressor’s internal âoverload device for reliable cycling in typical householdâ refrigerationâ systems.
- Primary functions: provide temporary â¤start âwinding current,limit inrush,and⣠disconnect the start circuit â¤by temperatureâdependent resistance rise.
- Common symptoms of failure: compressor hums âbut does not⤠start, repeated âŁstart â˘attemptsor open/very âhigh resistance âmeasured atâ the relay terminals.
- Compatibility/repair checks: match⤠terminal layout and nominal âŁcold resistance value, verify mountingâ and insulation ratingsand confirm the ârelay is specified for the ârefrigerator’s supply voltage and compressor model.
Technicians⣠can test⣠WR07X10055 by measuring cold resistance with the âŁrelayâ removed âfrom the âcircuit (expect a low⣠ohm reading) and⣠by observing that the start windingâ currentâ falls â¤after â¤a brief run interval; an â˘open circuit or fixed high resistance indicates a failed⤠PTCR. âWhen replacing the â¤unit select a part⤠with equivalent thermalâresistance â˘characteristics âŁand âŁmechanical form factor to⣠ensure⢠proper timing of âtheâ start disconnect – a physically smaller or â¤lowerâratedâ PTCR can leave the start winding energized too⢠long and cause compressorâ overheating,while â¤an âoversized element may cut out the start âwinding prematurely. In practice,matchingâ theâ partâ number and confirming âŁbasic electrical characteristics prevents most replacement mismatchesâ and⤠reduces repeatedâ compressorâ start failures.
| Item | Description |
|---|---|
| Part | WR07X10055,⣠PTCRâ start âŁrelay for GE⤠refrigerator⣠compressors |
| Function | Temperatureâdependent resistor that enables start winding current then âincreases resistance to remove the start âcircuit |
| Swift test | Cold low resistance on âmultimeter; âexcessive/high resistance or open =⢠failed |
How â¤the WR07X10055 â˘GE Refrigerator Relay PTCR â˘Works âŁInside the Appliance: Circuit Integration â¤and â˘Electrical characteristics
The WR07X10055 GE âRefrigerator Relay PTCR âis a âpositive-temperature-coefficient device used⣠in the compressor start circuit⤠to âmanage current to the start winding. Installed between â˘the compressor’sâ startâ and run âterminals â˘or mounted in âŁa relay⤠housing, the PTCR presents a relatively low cold resistance that permits the â¤start âwinding toâ draw the surge current needed âto establish rotor âmotion. As current flows,the PTCR âself-heats â˘and its resistance rises â¤sharply,effectivelyâ removing the start winding â¤from⤠the circuit once the â˘motor⤠reaches near-run â˘speed. This⣠solid-state timing action replaces âŁor complements electromechanical âstart relays âŁand capacitors⢠and is characterized byâ a specific âresistance-versus-temperature curve andâ rated current/voltage limits that must match the compressor’s starting profile⤠for reliable operation.
Technicians assess compatibility by verifying terminal layout,â measuring cold resistance with âthe compressor at⢠ambient temperature,⢠andâ confirming that theâ device’s trip behavior âand maximum dissipation align with the compressorâ nameplate data. Common field âindicators â¤of a failing unit⢠include repeated humming without start, long-start intervalsor â¤a compressor that starts only âafter multiple attempts; these symptoms point âto a PTCR that eitherâ fails to present the required low cold resistance or no longer increases resistanceâ correctly âŁwhen warmed.practical checks⣠includeâ cold-ohm âmeasurements, inspection of thermal discoloration at terminalsand substituting a known-good WR07X10055 âGE Refrigerator âŁRelay âPTCR where modelâ fit and electrical ratings âŁmatch.
- Features: solid-state start timing, mounts at compressor terminals, no mechanical⣠contacts to wear
- Common symptoms of⤠failure: hard start, intermittent starting, compressor hum without spin-up
- Service checks:â cold resistance measurement, visual terminal inspection, confirm matching ratings beforeâ replacement
| Item | Description |
|---|---|
| Function | Provides a⢠timedâ increase in resistance to remove⢠theâ startâ winding after motor acceleration |
| Typical â˘electrical trait | Low cold-ohm path forâ starting current; steep resistance rise with self-heating |
| Failure indicators | Compressor âfails to âŁstart,⤠prolongedâ humor âintermittent starting |
Common Failure Symptoms âand Diagnostic Indicators of a âFailing Start relay⢠PTCR
The WR07X10055â GE⣠Refrigerator âRelay PTCR âis a positive temperatureâ coefficient resistor âused to momentarily provide â¤low resistance to⢠the compressor âstart winding and⣠then increase âresistance as âit heats, â˘allowing the start winding to âdrop out. âŁIn practice this device replaces electromechanical start relays in many singleâphaseâ refrigeration compressors; compatibility depends on terminal⤠layout,mounting style,andâ the PTCR’s tripâ characteristics⣠matching the compressor’s start torque and â˘locked-rotor current.Aâ correctly⢠functioning PTCR will â¤show âlow âŁresistance â¤at ambient temperature to engage the start circuit and âŁthenâ rise in resistance once current flows, whichâ reduces start winding current⣠and prevents âŁoverheating of âthe motor. Mechanical symptomsâ in the appliance often reflect this electrical behavior rather than a âŁfailed compressor, so technicians⢠should confirm PTCR behavior⣠before replacing the compressorâ itself.
Common diagnostic â¤indicators are electrical and acoustic:⣠repeated clicking with no ârun, a⤠persistent humming compressor â˘that never reaches normal RPM, nuisance tripping of branch-circuitâ breakers due â¤toâ excessive⤠inrushand⣠elevated operating temperature of the compressor or PTCR. Practical âfield checks include a visual inspection for physical damage or corrosion,a cold continuity checkâ with a multimeter (low resistance â¤expected),and an âapplied-heat â¤test where the PTCR’s resistance should â¤increase as it warms;⤠if âresistance remains open or stuck low the start winding will either⣠never engage orâ remain engaged.When selecting a replacement, verify terminal positions and thermal responseâ to â¤ensureâ the replacement matches the original âPTCR’sâ function in the compressor⤠start circuit.
- Compressor clicksâ repeatedly but does not start (start circuit âfails to engage)
- Compressorâ hums continuously without reaching normal speed
- Frequent⣠breaker trips or blown fuses â˘on startup (high âinrush current)
- Compressor orâ relay housing unusually hot to â˘the touch
- Visible âdiscoloration, melted â¤housingor âcorrosion at terminals
| Item | Description |
|---|---|
| Cold resistance | Low resistance at ambient âŁtemperature to allow start â¤winding engagement; an open circuitâ indicates failure. |
| Heated behavior | Resistance should ârise⣠as â¤the â˘element warms, reducing start current; âŁfailure to rise can keep the start winding engaged. |
| Common electrical reading | Continuity at â¤cold; no short⢠to⣠ground. Intermittent or⢠infinite resistance under normalâ conditions âis diagnostic of a badâ PTCR. |
| Compatibility note | Match terminal layout, mountingand⢠thermal trip characteristics to the original part to ensure proper compressor starting behavior. |
Troubleshooting,Diagnostics,Compatibility,and Replacement Considerations for â¤WR07X10055 GE Refrigerator relay âPTCR
The⣠WR07X10055 GE â¤Refrigerator â˘Relay PTCR is a positive temperature coefficient (PTC) start âdevice used to⣠momentarily route extra âcurrent to the compressor start â˘winding during motor â¤startup.⢠Unlike âan electromechanical start relay, the PTCR is a â˘solid-stateâ thermistor that âpresents⤠a low resistance when cold to provide the start torque, â¤then⤠its âresistance⤠rises quickly⣠as it heats â¤and âŁeffectively removes the start winding from the circuit. In practical âservice this device changes the compressor’s inrush profileâ and startup timing; failures typically show as an inability to achieve start⢠torque (long hums),excessive heat at the device,or intermittent starts caused âŁby degraded thermal behavior or internalâ cracking from repeated thermal cycling.
- Commonâ symptoms: continuous humming, repeated attemptsâ to start, âhigh run âŁcurrentor no response when compressor calls for run.
- Quick checks: verify compressor receives line voltage, feel for disproportionate â¤heatâ on âŁthe PTCRand measure⤠cold vs.warmed â˘resistance for a large positive change.
- Replacement considerations: match electrical characteristics, terminal âŁlayoutand â˘mounting/thermal âenvironment⢠to avoid âreduced starting torque âŁor nuisance failures.
| Item | Description |
|---|---|
| Function | Provides temporary low resistance to engage â¤compressor start winding; self-limits by increasing resistance as it heats. |
| Failure modes | Open-circuit when cold,high leakage,orâ reduced resistanceâ rise âŁcausing weak âor intermittent starts. |
| Compatibility | Must match⤠compressorâ start current and terminal arrangement; use OEM part ânumbers or verified⢠cross-references. |
For âdiagnostics,⢠measure⣠whetherâ the PTCR shows a marked resistance⤠increase⢠after âa brief warm-up and confirm the⤠compressor⤠receives full line voltage atâ the start attempt; compare measured behavior against known-good units or manufacturer specifications. When âreplacing â¤the device, select a unit with âthe⤠same⢠thermalâ coefficient and electrical ratings and âensure the replacement physically mounts so⤠itâ can â˘dissipate heat similarly to⢠the original; replacing the PTCR⣠without addressing a⤠weak compressor⤠or a damaged start winding may âŁonlyâ mask the root problem. Technicians should also â˘inspect associated protective components (overload protector, wiringand capacitors where applicable)⢠because a failed PTCR often âaccompanies or reveals âother failures in the starting circuit. â˘
Q&A
What⤠is the WR07X10055 PTCR relayâ and what does it do âŁin my GE refrigerator?
The WR07X10055 is âa PTCR (positive temperature coefficient resistor) â˘refrigerator â˘start device used on many GE/Hotpoint/Kenmore compressors. it provides a low-resistance âpath to â¤the⣠compressor’s start winding when âŁthe compressor first âŁattempts to start, then heats up and its resistance rises âto remove/start-limit theâ start winding âcurrent once the motor is running. In short, it helps the compressor start reliably and then reduces currentâ toâ protect the â˘motor.
What areâ common symptoms that the WR07X10055 has failed?
Typical signs include: refrigerator ânot cooling,⣠compressorâ humming but⢠failing to â˘start, frequent start attempts or clicking, the compressor running â˘briefly then âstoppingor the fridge tripping a breaker.Visual signs can include burn or heat damage on the relay housing. â˘Note: similar symptoms can⣠be caused by a seized compressor, badâ start capacitor (on âŁotherâ systems)or control board problems, â¤so confirm âwith âtesting.
how can I test âŁthe âŁWR07X10055 PTCR relay âsafely?
Always unplug the refrigerator⤠before testing.â Remove theâ relay from the compressor⣠terminals (usually a âŁplug-on device under⣠a rubber boot). With⢠a multimeter set to ohms, check⤠for an open/short condition between the⤠relay âterminals and for a âshort to chassis âground. A completely open or⣠shorted unit indicates failure. For PTCR behaviorâ you can cautiously warm the part (hair dryer at âŁlow â¤distance) and observe resistanceâ riseâ – the âresistance should increase as it heats.â If you’re⢠unsure⢠of readingsâ orâ expected values, âreplacing âthe relay is inexpensive and often the quickest âconfirmation. âDoâ not⤠apply⣠mains voltage to test âunless you are qualified.
Canâ I run the refrigerator without the PTCR relay installed?
No. âThe relay/PTCR is required toâ provide the starting torque for theâ compressor. Removing it will usually prevent the⣠compressor from starting âŁand can lead to repeated âattempts that trip the overload protector or damage the âcompressor. Do notâ operate â¤the refrigerator withoutâ a proper start device installed.
How do I âŁreplace the WR07X10055? Any tips for installation?
unplug â¤the refrigerator. Locate the compressor and⣠remove the rubber boot covering the relay. Pull the old⢠relay straight off âŁthe compressor⤠terminals (some clip in). Install â¤the new WR07X10055â by seating it⢠firmly on the same terminals and reinstall⤠the rubber âŁboot. âReconnect power andâ observe startup.⢠make sure wires are secure and the relay is the correct⤠OEM replacement. If the compressor still fails to start afterâ installing âa known-good relay,there may be an internal compressor fault or otherâ electrical issue.
Is⣠the WR07X10055 compatible with my refrigerator⤠model?
WR07X10055 â¤is an OEM GE part used on many GE/Hotpoint/Kenmore models, but compatibility is⢠model-specific. Always confirm â˘compatibility by checking your⤠refrigerator’s model number against the â¤part âlisting or the manufacturer’s parts â¤diagram. If in doubt, provide your appliance model number â¤to the âparts⣠supplier or technician for verification.
What tools and safety precautions should I âŁuse when⢠handling⤠or replacing this relay?
Tools: basic â˘hand tools (needle-nose âpliers),â a â˘multimeter forâ testingand possiblyâ a socketâ or âscrewdriver⢠to access compressor covers. Safety: unplug âthe⤠appliance before touching electrical components,⣠wear eye protection âand insulated gloves if available, avoid shorting compressor terminalsand⣠doâ not attempt âsealed-system repairs (refrigerant work)â unless licensed.Ifâ you’re not comfortable,hire aâ qualified appliance technician.
How âŁmuch does⢠the â˘WR07X10055 cost⢠and is⤠it worth âŁreplacing?
The WR07X10055 start device is generally âlow cost (commonly in the $10-$40 range retail). â¤Because it is inexpensive and easy to âŁreplace,â it is usually a worthwhile first repair when you have starting problems. however, if the⣠compressor is mechanically seized âor has an âinternal failure, replacing the relay will not fix the problem and âcompressor replacement or further diagnosis will be required.
Closing Remarks
The WR07X10055 âGE Refrigerator Relay PTCR serves â¤as aâ key component in theâ compressorâ starting circuit, âŁproviding the necessaryâ resistance change to âŁhelp theâ compressor motor start⤠reliably and then drop out âof the circuit once the⤠motor âis running. Because it directly affects the compressor’s ability to start and theâ overall electrical protection of the refrigeration⣠system, a properly functioning PTCR relay contributes⤠to consistent cooling performance, energy â˘efficiencyand reduced risk âof compressor strain or failure.
Accurate diagnosis and timely replacement of a⣠failing WR07X10055 relay are⤠importantâ to âavoid â˘needless downtime⤠and to prevent secondary damageâ to the compressor âand other components. Identifying⤠symptoms such as failure to start, unusual âŁhummingor intermittentâ operation-followed by appropriate testing or evaluation by⤠a qualified technician-helps â¤ensure thatâ the relay is the root causeâ before⣠parts are replaced. When replacement is required, using the â¤correct, â˘compatible⢠part and⣠following safe âinstallation practices preserves system reliability and appliance safety.
the WR07X10055 GE refrigerator Relay âPTCR plays a â˘small but critical⤠role in ârefrigerator operation. Careful⢠assessment⢠and âproper replacement when necessaryâ support long-term performance, reduce the likelihood of moreâ costly repairs, âand maintain safe, efficient⤠appliance operation.
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