4387913â Whirlpool⤠Refrigerator Primary Overload is a temperatureâsensitive protective device usedâ in â¤refrigerator â˘compressor circuitsâ to prevent motor⣠damage from excessive current or âoverheating. As a primary overload,it is indeed a⢠series protectiveâ element-typically implemented as a thermal or thermistor-based protector-that âopens the compressor circuit under abnormal thermalâ or electrical stress conditions and closes when the device⢠cools to a âsafe operating point.
inside the âappliance, the primary overload is mounted on or adjacent to the hermetic compressor â¤and works⣠in concert with â¤the âstart relay and the compressor windings. It senses internal compressor temperature âŁand current âdraw and âinterrupts the supply when thresholds are exceeded,â preventing sustained locked-rotorâ conditions, thermal ârunawayor winding⢠insulation failure. Technically, âit⣠interfaces with the compressor terminal block⤠and the control systemand its behavior will affectâ starting characteristics, run timeand fault â¤reporting.â Diffrent designs may be⢠automatic-reset â¤or â¤require manual interventionand⢠they are selected toâ match the compressor’s inrush âand â˘running âŁcharacteristics.
in this âarticle youâ will learn how the 4387913 overload functions withinâ the compressor â¤starting and⢠protectionâ scheme, â˘which compressor types and Whirlpool model families commonly use this â¤part, typical symptoms of a âŁfailing or⤠open overload (for example, a humming or nonâstartingâ compressor, âintermittent operationorâ repeated trips),⣠diagnostic checks âto âŁnarrow the fault to âthe overload versus related componentsand practical replacement considerations such asâ electrical ratings, terminal layout, mounting orientationand âsafety precautions when âservicing âtheâ compressor circuit.â the focus âis on providing technicians, â¤engineersand informed appliance owners with the technical context â˘needed to âevaluate compatibility, identify failure modesand âmake informed decisions about repair or replacement.
Table of Contents
- Function and â˘Role of the Refrigerator Primary Overload in Compressor Start Protection
- How the 4387913 Whirlpool Refrigerator âPrimary âOverload Works Within âthe Compressor⢠Motor â˘Circuit
- Common Failure Symptoms and Electrical Indicators of⣠a Defective Primary Overload
- Compatibility,Replacement Considerations âand Step-by-Step Installation for Primary Overload Units
- Q&A
- Future âOutlook
Function and Role of the refrigerator⢠Primary Overload â˘in Compressor⣠Start Protection
The 4387913 â¤Whirlpoolâ Refrigerator⤠primary Overload is a thermal/current protection device installed â¤in the compressor âstart circuit⣠to prevent damage â˘from locked-rotorâ conditions,prolongedâ start attempts,or excessiveâ motor temperature. Functionally it interrupts the current to the compressor start winding or start relay⢠when the current or temperature exceeds its specified threshold, removing the start torque âŁuntil theâ device cools and resets âŁ(or remainsâ open if the⤠unit is âŁa âŁsingle-trip â¤design).In practiceâ the overload â˘is⢠mounted adjacent to or clipped onto the â¤compressor body and must matchâ the compressor’s⣠mechanical mounting,terminal layout,and trip characteristics to provide correct âŁprotection and reliableâ starting â˘behavior.
Technicians⣠diagnose the primary overload by checking â¤continuities and⢠observing compressor behavior: a failed overload commonly presents as a compressor that hums but will not startor âa âŁunit that starts intermittently and trips after short running periods. Practical replacement requires confirming the 4387913 âŁWhirlpool Refrigerator Primary Overload matches the original in âcold continuity, rated hold/trip currentand physical⢠fit; substituting a âunit âwithâ incorrect âŁtrip characteristics can âproduce nuisance trips or inadequate protection. For field troubleshooting,⣠verify supply â˘voltage at the relay, measure cold âcontinuity⣠across âthe⤠overloadand if available âtest with âŁa known-good âoverload assembly⤠before replacing the compressor or othre hard components.
- Primary role: open start circuit âunder overcurrent/overtemperature conditions to protect compressor windings.
- Common â¤failure indicators: humming âcompressor,repeated start attempts,or open continuity â˘at ambient temperature.
- Compatibility factors: terminal type, mounting clip⣠orientationand trip/current ârating must match OEM specifications.
| Item | Description |
|---|---|
| Function | Interrupts start winding/start relay on overcurrent or overtemperatureâ to prevent compressor damage. |
| Typicalâ failure symptom | Compressor humsâ but does not start, intermittent starts, â¤or open circuit reading at ambient âtemperature. |
| Mounting/compatibility | Must match compressor⣠clip location, terminal configurationand trip â¤characteristics for correct operation. |
How the 4387913 âWhirlpool Refrigerator Primary Overload works Within the âŁCompressor Motor⤠Circuit
The 4387913 whirlpool Refrigerator Primaryâ Overload is a thermal/current protection device installed in series with the compressor motor â˘circuit to prevent winding damage⢠from sustained overcurrent or â˘excessive motor temperature. Inâ practice the overload sits⢠between â¤the line and theâ compressor start/run windingsâ (often adjacent âto the start relay) so⢠that âŁif the motor drawsâ abnormal current or âŁthe compressor overheats the device opens and interrupts current flow. âthis protective action is passive⤠and automatic: âthe part â¤is normally closed at ambient temperature and⢠either increases resistance rapidly (PTC-style) or opensâ its internal contactsâ when âa predefined thermal/current threshold is reached, then returns to theâ closed state â˘after cooling. Technicians diagnosingâ a non-starting compressor â¤commonly inspect the overload â˘when the relay clicks⢠but the compressor does not runor⤠when a⢠compressor starts briefly then⣠stops-conditions âconsistent with an overload that is openâ or marginal.
- Typical behaviors: normally âclosed at rest; opens under overcurrent/overtemperature; â˘automaticallyâ resets after âŁcooling.
- Common symptomsâ of a â˘failing overload:⢠no continuity when â¤cold,⣠intermittent startsor thermal trips underâ light load.
- compatibilityâ considerations: match terminal style, mounting⣠clipand trip â˘characteristics to the compressor model rather than relying only on visual similarity.
- Basic â˘bench checks: verify cold continuity and confirm⤠that â˘the â¤part is mounted correctly to sense compressor temperature; âan âout-of-spec resistance or âan open circuit cold indicates replacement.
Withinâ the motor circuit the â˘primary âoverload works in concert with the start ârelay and â¤anyâ start capacitor to manage inrush and prevent thermal runaway; whenâ the compressor âŁstalls orâ the motor overheats the⢠overload reduces⣠or â¤removesâ current â˘to the start/run windings, preventing insulation âŁdamage. Some overloads âŁemploy a PTC element âthat increases resistance to limit starting current as temperature rises, while others are thermostatic and open a contact when aâ temperature threshold is reached-understanding which type is fitted influences both diagnosis and replacement strategy. For practical â˘replacement,ensure the â¤substitute part matches the original’s electricalâ characteristics âŁand thermal coupling so that the âŁcompressor âretains its designed protection and start behavior⣠under⤠normal and fault conditions.
Common Failure Symptomsâ and Electrical Indicators of a Defective Primary Overload
Theâ 4387913 Whirlpool Refrigerator Primary Overload is a thermal/electricalâ protector installed in series with⢠the compressor start circuit toâ limit inrush âcurrentâ and protect the compressor from overheating. Functionally it will open the circuit when the â¤compressor draws excessive current⢠orâ the deviceâ reaches its thermal trip pointand then âreset when⤠it cools. A healthy primary overload⣠presents as⣠a low-resistance path at ambient temperature and passes current to the start winding; a âfailed unit commonlyâ becomes âan⤠open â˘circuit or develops a high-resistance⤠connection that âproduces âa âvoltage dropâ and weak starting torque. As the overload âŁresponds to temperature,⣠bench continuity checks can sometimes be misleading: an overload âŁthat intermittently opensâ underâ load mayâ test âgoodâ âcold but fail in service.
Common failure⢠symptoms and electrical indicators âinclude compressor humâ without rotation, repeated⤠start-relay clicking, intermittent startsand elevated line current or â¤nuisance breaker trips. Troubleshooting⤠typically involves measuring continuity âacross the overload (expecting a low-resistance readingâ when cold), checking voltage at the âŁcompressor terminals âduring a start attempt (a near-line voltageâ at the start terminal⢠indicates the⢠overload is passing â˘current)and comparing in-circuit behavior to known-good components. Physical signs such as heat discoloration⤠or melted housingand a âsymptomâ pattern where the compressor runs⣠only afterâ prolonged⣠cooldown, further point to overload failure; replacing the device with a compatible unit â¤is often the practical repair when these indicators are present.
- Compressorâ hums butâ does not start; start relay ârepeatedly clicks.
- Intermittent starting: works after long cooldown, fails under normal âŁoperation.
- Multimeter shows open circuit or higher-than-expectedâ resistance across âŁthe overload.
- Visible heat âdamage or deformation on the overload housing.
| Item | Description |
|---|---|
| Continuity | Healthy: low resistance (single-digit ohms) atâ ambient. Failed: open or substantially higher resistance causing voltage drop. |
| Voltage âbehavior | During âŁstart, âthe start terminal should⣠seeâ near-line voltage if â˘the overload âis conducting; absence indicates an open or âŁtripped overload. |
| Physical signs | Discoloration, cracked or melted housing,â and loose terminals âindicate thermal/mechanical failure. |
Compatibility,⤠Replacement Considerations âand Step-by-Step installation âfor Primary Overload Units
The 4387913 Whirlpool Refrigerator â¤Primaryâ Overload is a thermal/current-sensitive protector thatâ sits inâ series with the compressorâ start circuit âand prevents the compressor from attempting to start⢠under excessive âcurrent âor âelevated âŁtemperature.It is indeed not an electronic controller but a passive device⤠that opens⢠the start winding circuit âŁwhen âŁit senses excessive heat â˘or prolonged currentâ draw; this prevents winding damage and⣠reduces the risk of compressorâ burnout. Compatibility depends on mechanical fit,â terminal styleand thermal â˘trip characteristics:⤠match the physical clip or bracket to the compressorâ shell, confirm terminal type and spacing,⤠and verify the overload’s â¤trip behavior and ratings against theâ compressor or OEM part⣠number rather than relying solely on âcosmetic â˘similarity.
Replacement and installation are âstraightforward for aâ technician âŁwhen compatibilityâ is confirmed, but proper safety and verification steps avoid â¤misdiagnosis. â¤Before â¤replacing, verify the compressor âŁand start device behavior â˘with a multimeter (continuity âcold, â¤open when âŁsimulated overcurrent) and compare âthe existing part’s mounting and⢠terminal âlayout to the new unit. For installation, disconnect power, label and photograph wiring locations,⤠remove the compressor access panel, release the clip or fastener securingâ the old⢠overload, â¤and install âŁthe new unit so âterminals make solid contact; after â¤reassembly,â restore power and observe compressor⤠startup current and run behavior for several minutes⤠to â¤confirm normal⤠operation.
- Verify part fit: terminal type,spacing,and clip fit to compressor shell.
- Measure continuity and⣠compare to known-goodâ behavior before replacing.
- Label âwires, remove âaccess panels, swap units, then observe compressor⤠start-up.
| Item | Description |
|---|---|
| Typical terminals | Two spade-style connections; confirm 1/4″ vs. smaller spade and spacing. |
| Diagnostic behavior | Continuityâ when⤠cold/normal; opens when thermally tripped â˘or overcurrent present. |
| Mounting | Press-fit âclip or bracket onto compressor shell-ensureâ full seating forâ thermal contact. |
Q&A
What is the 4387913 Whirlpool Refrigerator Primary Overload andâ what does it⢠do?
The 4387913 isâ the âprimary compressor overload (thermal⤠protector)â used on manyâ Whirlpool-family refrigerators. It sits on the compressor and protects the motor from overheating and excessive current by âŁopening âthe circuit when temperatures or currents exceed safe limits,then âclosing again when âthe compressor âcools. It is⣠different from â¤a⢠start relay; the overload is a protective âdevice in â˘series âŁwith the compressor windings.
What⤠are âthe common symptomsâ of â¤a failed 4387913â primary overload?
typical âsymptoms⤠include⣠a compressor that hums but won’t start, repeated clicking âor cycling of the relay, the fridgeâ becoming warm, frequent tripping of the house breakeror the compressor not running at all. As the âoverload can be intermittent, you may also see⤠the compressor startâ sometimes and not others.
How can Iâ test the 4387913 primary overload?
Always disconnect power before testing. Access the compressor â¤(pull fridge out,remove⣠rear access⤠panel),disconnectâ the overload from â˘the⤠compressor terminals,and use a âmultimeter set to continuity or ohms. A âŁgood overload normally shows continuity⢠(aâ low resistance) when cold; an open â(infinite)â reading indicates aâ failed â¤device.⤠Note this is a basic test – some failures are intermittent or temperature-dependent, so ifâ testing is inconclusive â¤you may need toâ replace the part or bench-test withâ a known good overload.Do â¤not apply âpower to the compressor terminals while probing.
Is the âprimary overload the⣠same as theâ start relay â¤or start⤠device?
No. The overloadâ is⢠a thermal protective device in series with the compressor windings. The start relay âŁ(or start device) âassists â˘the compressor’s âŁstart â˘winding to get the motor turning. Bothâ can âfail and cause similar symptoms âŁ(compressor hums and won’t start), so you may âŁneed to test or replace both the start relayâ andâ the overload â¤when diagnosing â¤a no-start⣠compressor.
Can âŁI run the compressor withoutâ the⤠4387913â primary overload?
No. Running a compressor without its âoverload protector âis unsafe.â The overload prevents⢠overheatingâ and protects theâ compressor windings from damage.⢠Bypassing or removing it risks severe compressorâ damage,possible fire,and will void warranty âand â¤likely â˘appliance â˘safetyâ standards.
How⢠do I replace the 4387913 primary overload?
Disconnect âŁpower, pull âtheâ refrigerator awayâ from the walland remove the rear access panel toâ reach the⢠compressor. note the âwiring positions, âcarefully⢠pull off the connector(s) from⢠the oldâ overload â¤(they frequently enough⤠slip on),⢠andâ replace âwith the new OEM 4387913 unit. â¤reinstall the cover and⣠restore power.â Use âthe exact replacement part âor a âverified cross-reference and follow⣠basicâ electrical safety.â If âyou’re not agreeable âor the⢠compressor â˘requires further service (sealed-system work), call a qualified technician.
Which Whirlpool modelsâ use âŁpart 4387913 and is it compatible across brands?
Partâ 4387913 is â˘used on many Whirlpool,⣠Maytag, Amana and âKenmore refrigerator models,â but compatibility varies by compressor type and â¤model year. Always â˘check your refrigerator model numberâ against the part cross-reference or the dealer’s parts â˘lookup to confirm compatibility before buying. Aftermarketâ versions exist, but âOEM parts ensure fit and function.
Where can I buyâ a replacement 4387913 and how much does it â¤typically cost?
you can buy⤠the 4387913 from Whirlpool/Whirlpool parts âdealers, authorized appliance parts âdistributorsorâ reputable online parts retailers. âŁPrimary overloads are⤠generally inexpensive; typical retail prices are⤠commonly in the low tens⢠of dollars â(frequently enough âaround $10-$30), depending on supplier and whether it’s OEMâ or aftermarket. if you’re unsure about âdiagnosis⢠or installation, factor âin technician labor into total repair cost.
Future Outlook
The 4387913 Whirlpool refrigerator primary overload serves as a critical protective âdevice for the⢠compressor, interrupting current flow when âabnormal electrical or thermal conditions â¤occur. By⢠preventing excessive current drawâ and âreducing the risk of compressor overheating â¤or⣠damage, this component helps âmaintain reliable cooling performance and extends the serviceâ life â˘of the refrigeration system.
Because symptoms of â˘overload failure can overlap with other electrical â˘or mechanical⢠issues, proper â¤diagnosis is essential.Accurate identification-ideally performedâ with appropriate âtesting â˘equipment by âa trained technician-ensures theâ root cause â˘is addressed ârather than replacing parts⣠unnecessarily.Correct diagnosis also reduces downtime and avoids further damage to related âcomponents.
When âreplacement is⢠necessary, using the correct â¤replacement partâ and following proper installation practices ârestores the⤠intended â˘protection and⤠performance of the â¤compressor. Prioritizing accurate diagnosis and timely, professional replacement helps⤠preserve appliance efficiency, safetyand longevity, delivering better outcomes for owners and⤠service âproviders alike.
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