279737 Whirlpool Dryer Load Timer is an electromechanical timing assembly used tooâ sequence and controlâ drying cycles âŁin compatible⢠Whirlpool tumble dryers.⣠As âa load⢠timer, the part provides timed actuation⤠of internal switch contacts and theâ user-selected cycle â¤duration, typicallyâ driven by a⢠small synchronous⤠motor and cam arrangement; it is identifiedâ by the OEM part number and is intended toâ replace the factory timer mechanism in applicable⢠models.
Inside the appliance, the load timer coordinates the dryer’s major subsystems by opening and closing contacts⢠that route power to the driveâ motor, the heating element orâ gas âŁvalve,â and âŁauxiliary circuits such âas timers for cool-down, drum rotationand indicator lamps. âŁIt interacts with safety âand âsensing devices – for example,â door switches, thermal cutouts,â thermostats/thermistorsand moisture sensors – so that âthe electrical sequence responds âŁto â˘user inputs and protective interlocks. in practical terms⢠the timer⣠provides⤠the timing logic that âintegrates mechanical sequencing âŁwith the âdryer’sâ electrical⤠load distribution.
In this article readers will find a technical overview of the 279737 load timer’s intended function âand⢠the types of dryersâ whereâ itâ is typically âused, guidance onâ compatibility and modelâ fitâ considerations, common â˘failure symptoms and diagnostic checks, step-by-step âtroubleshooting approaches â(including⣠continuityâ and⤠contactâ inspection)andâ practical replacement considerations such as connector verification,â mechanical alignment, âand⣠safety precautions. The focus is on giving technicians, engineers, âand appliance owners the âinformationâ needed â¤toâ identify issues and make informed repair or replacement decisions.
Tableâ of â¤contents
- Function and Role of the Dryer Load Timer in Dryingâ Cycle Control
- How âthe â279737 âWhirlpool Dryer Load timer Works: Internalâ Mechanisms, switch â¤Contacts,⢠and Signalâ Flow
- Common Failure Symptoms: Intermittentâ Cycles, No Motor Powerand Incorrect Timer Advancement
- Compatibility and Appliance Models: Identifying Whirlpool Units âand CrossâReference Part Numbersâ for 279737
- Replacement âConsiderations â˘and Installation⢠Procedure: Wiring, Mounting, âŁand Safety âPrecautions
- Troubleshooting and Diagnostics: Multimeter Tests, Continuity⤠Checksand â˘Diagnostic Flow âSteps
- Q&A
- In summary
Function and â˘Role of the Dryer Load Timer in Drying Cycle âControl
The 279737 Whirlpoolâ Dryer Load timer is âan electromechanical sequencing deviceâ that governs âŁthe timed progression of a â˘dryer’s âcycles by actuating a set of cam-operated contacts.It receives controlâ power and inputs from the âstart and door switches,â and it sequentially supplies voltage to the motor,â the⣠heating âcircuitand any interlock or indicator âcircuits according to the selected âtimer position. In typical installations the timer coordinates with thermostats and⢠thermal cutouts; it does not senseâ moisture level itself but enforces the elapsed-time portion⤠of âautomatic and manual dryingâ programs, making it critical for correct sequence timing and safe heater control.
- Primary function: sequence and time power to motor, heater,â andâ auxiliary circuits âvia cam contacts.
- Typical inputs/outputs: line voltage supply, start/stop input, contacts⢠for motor, heater relayandâ indicators.
- Common failure symptoms: cycles⢠that do not advance, continuous run without heat, no start on any⢠settingor stuck positions.
- Compatibility ânotes: â˘replacement requires matching terminal âlayout, cam indexing, mounting orientation,⣠and control voltage.
| Item | Description |
|---|---|
| Type | Electromechanical cam timer (multi-contact) |
| Typical supply | 120 VAC âcontrol circuit⤠(verify âmodel-specific ârating) |
| Primary outputs | Motor circuit, âheating⤠circuit contactsand accessory/interlockâ contacts |
| Replacement guidance | Use part âŁnumber 279737 â˘or an exact terminal/configuration match; âcheck continuity and⣠cam alignment during installation |
For troubleshooting and replacement, technicians should verify continuity across⢠the timer contacts as the âtimer advances manually âŁor with power âappliedand âcompare the physical terminal numbering and cam profile to the service replacement. practical examples: if the⤠dryer motorâ runs but there is noâ heat, check the timer’s heater-contact path âŁand associated thermostats; if settings do ânot change or the motor neverâ starts, suspect worn âcams â˘or broken internal gear âteeth. When replacing âthe unit, transfer wire routing and connector positions âexactly or refer to the wiring diagram to preserve correct âsequencing and safety interlocks.
How the 279737 Whirlpool Dryer Load Timer Works: Internalâ Mechanisms, Switch Contactsandâ Signal Flow
The 279737 whirlpool Dryer Load Timer is âa mechanically driven â¤cam âtimer that sequences power to the⤠dryer’s subsystems â¤by rotating a cam pack and switching multiple contact banks. A small synchronous âmotor drives the cam rotor;â theâ cams open and close stacked contacts arranged for âdifferent âdial positions (timedâ dry, âair âfluff, etc.). Each contact stack routes line⣠voltage throughâ interlocks such as the door switch, thermal cutoutsandâ cycling thermostats,⢠soâ the timer does not act⣠alone but as the central routing node⤠inâ the âappliance’s control chain. Technicians âshould verify â˘compatibility with a â˘model-specific parts list or wiring diagram before replacing the timer because terminal assignments andâ cam profiles âvary across dryer models and productionâ years.
- Timerâ motor supply – provides âŁclocking rotation autonomous of â¤load circuits
- Motor/run⤠contact – supplies the⢠drum/motor circuit when âclosed
- Heat âelement/gas valve contact – connects heating only âin⣠the positions that require it
- End-of-cycle contact – signals the dryer to âstop (or to⢠move to⢠cool-down)
- Common failure modes – pitted/burned âŁcontacts, intermittent continuity, stuck cams
The internal signal flow âbegins with mains âŁpower entering the timer input terminals; as the cam âadvances, specific contact âpairs close to complete circuits to the motor and heater⤠through protectiveâ devices. Such as,â on a âtimed-dry⣠setting the timer will⤠together close a motor ârun âŁcontact and, after any required interlock checks, a heater âŁcontact âthat routes currentâ through theâ high-limit and cycling âthermostats to the heating element. â˘Practical troubleshooting uses a multimeter to check continuity across individual contact pairs while manually advancing⤠the dial (power removed for static checks, powered checks only whenâ safe and controlled). Visible signs suchâ as â˘arcing,⣠blackening,⢠or a⣠burnt odor â¤correlate with high-resistance contacts â˘that⣠cause intermittent â˘heating or failure to advance; when contacts are compromised, replacing â¤the complete 279737 timer assembly⤠or matching replacement is the reliable⢠corrective action after verifying terminal âmapping against the âŁdryer’s schematic.
| Item | Description |
|---|---|
| Cam⤠pack | Rotating profile that actuates the contact banks⢠for each dial position |
| Contact bank | Sets of switch contacts that⢠route line powerâ to motor, heater, âand control âcircuits |
| Synchronous motor | Provides steady, timed â˘rotation of the cam⤠at mainsâ frequency |
| Common fault | Pitted or welded â¤contacts â˘causing lossâ ofâ heat, no âŁmotororâ no cycle advance |
Common Failure Symptoms: Intermittent âCycles, No Motor Powerand⢠incorrect⤠Timer Advancement
The 279737 Whirlpool Dryer Load Timer âis an⣠electromechanical sequencing assembly⣠that routes line voltage to the motor, heaterand other cycle functionsâ according âto cam positions. Inside the assembly a âŁsmall synchronous⢠timer motor rotates a cam âstack that âcloses and âopens discreteâ switch contacts; wear on the cam âlobes, stripped gears, a âfailing timer motoror pitted/burned contacts produce âthe behaviors described below.⤠Thisâ part is âcompatible with aâ range of Whirlpool dryerâ control layouts but⢠must be matched to theâ dryer âŁmodel and connector harness – âidentical-looking timers can have âdifferent contactâ layouts or terminal assignments,⣠so verify terminal⢠function before assuming interchangeability.
Technically, symptoms such âas âintermittent cycling,⤠loss of â˘motor poweror incorrect⤠timer advancement usually point to either aâ mechanical failure in the timer drive train or an electrical âfailure of one of⤠the⢠cam-operated contacts. For diagnosis, visually inspect the â¤cams and gears for stripped teeth, âŁcheck continuity across motor and motor-switch terminals âwhile manuallyâ advancing âŁthe timerand measure the timer motor â¤supply (typically mains voltage) to â˘distinguish âa dead â˘timer motor from a faulty contact. Practical examples: if⢠the drum and heater stop mid-cycleâ but â˘the control light remains on, the motor-contact in the timer is âlikelyâ opening intermittently; if the timer motorâ receives voltage but âthe âŁcamâ does not advance, the internal geartrain âor rotorâ coupling is worn and the timer must beâ replaced.
- Intermittentâ cycles: dryer starts and âstops unexpectedly due to intermittent timer contacts or worn cam âŁlobes.
- No⣠motor power: motorâ circuit â¤contact in âŁthe timer failing open while other â¤circuits remain powered.
- Incorrect timer advancement: timer motor runs âbut gears or pawls are stripped, causing skipping⣠or failure to advance.
| Item | Description |
|---|---|
| Timer âmotor voltage | Measured at the â¤timer â˘motor terminals; typically âmainsâ voltage when the control is in a âŁrunning position. |
| Motor contact âfunction | Cam-operated switch that⤠supplies⢠the drive⣠motor; pitting or carbon build-up causes high resistance or open circuit. |
| Compatibility note | Confirm connector layout⤠and terminal assignments against the dryer model number;â physical fit alone⢠does not guarantee⤠identical â˘contact mapping. |
Compatibility and Appliance Models: Identifying Whirlpool âUnits and CrossâReference Part Numbers for 279737
The ⤠279737 Whirlpoolâ Dryer â˘load⣠Timer is an â˘electromechanical⢠sequencing device that advances the dryer’s timed âŁcycles⣠by rotating a cam-driven âswitch stack and a âsmall synchronous motor. âThe timer provides⤠timed â˘closureâ of circuits for theâ heater, motorand ancillary circuits (e.g., âmoisture sensors, solenoids)â according⣠to the cam â¤profileâ and⣠indexed stops. Common failure âmodes are⢠worn or âŁburnt contact points, sticky âcams that prevent indexing, a failed⣠synchronous motor that no longer rotates,⢠orâ broken splines⢠on the âshaft; each produces diagnosticâ symptoms such as âno âŁcycleâ advance, intermittent heatingor⣠loss of âselected cycleâ functions. Technicians âverify operation â˘by observing motor rotation, âmeasuring continuity across switched contacts â˘during indexing,⣠and comparing the cam signatures against the service manual to âensure correct cycle sequencing.
Compatibility dependsâ on â¤the mechanical interface and â˘electrical âŁpinout as much as the part number: mounting âŁflange dimensions, shaft diameter/spline and length,⣠cam/wiring harness orientationand âŁvoltage/current âratings must match the dryer model. Cross-reference checks should⣠include visual confirmationâ of theâ harness connector and pin assignments, â¤aâ comparison of cam profiles (to preserve⤠cycle timing)and âconfirmation⤠that the replacement timer’s motor speed matches the âoriginal synchronous motor rating. â¤Practical replacement â¤stepsâ include removing the control panel to verify the timer’s part stamping, matching âŁthe connector pinout with a âŁmultimeterand swapping the shaft/camâ orientation if â˘the replacement offers reversible mounting.if the physical or electrical details differ, âselect a timer listed for⣠the specific appliance âmodel rather âŁthan⤠relyingâ solely⤠onâ a numeric cross-referenceâ to avoid altered⤠cycle behavior.
- Verify: mounting pattern, shaft spline/length, connector âŁtype, cam profileandâ motor voltage.
- Test: motor rotation and contact continuity while manually indexing â¤the timer.
- Note: identical part numbers usually interchange,but differences in cam profiles or âharness revisions require model-level confirmation.
| Item | Description |
|---|---|
| 279737 | Whirlpool âload⢠timer assembly -â confirm mounting flange,shaft spline and â¤harness pinout â˘match the dryer; used âto â˘sequence âheat and motor circuits via cam-operated switches. |
Replacement Considerations and Installation⢠Procedure: Wiring, Mountingand Safety âPrecautions
The⣠279737 â˘Whirlpool⣠Dryerâ Load Timer is an electromechanical control assemblyâ that sequences line-voltage⣠feedsâ to âthe motor, â˘heater circuitsand timer motor through â¤a set of cam-operated contacts. In âpractice thisâ timer provides timed switching and program-dependent contact closure rather than regulating temperature directly; failures typically âmanifest â˘as a âŁdryer that will not advance âcycles, stays in a single mode (e.g.,continuous heat),or does not âstart. Verify compatibility â¤by matching âthe OEM part number, shaft diameter and splineâ countand⤠the terminal â˘layout on the wiring âharness âagainst the appliance’s wiring diagram – a mismatched shaft â˘or terminal⤠mapping âwill âŁproduce incorrect â˘sequencing even if the timer â¤fits â˘physically in the control panel.
Duringâ replacement prioritize electricalâ isolation, mechanical⣠alignmentand verification before full-power operation. Mechanically, align the âtimer shaft with⢠the knob splineâ and⤠ensure the cam pack seats against âthe mounting flange so contact timing is preserved. Electrically, tag or photograph each connector, transfer wires one at a timeand confirm continuityâ of expected contacts with a multimeter before reapplying mains voltage; after â˘installation run a⣠no-heat âor⢠air-only cycle to confirmâ motor and timer advance, then verify heater switching under controlled â˘observation.Replace any brittle insulation or corroded terminals, secure⣠the ground conductor to the chassis,â and tighten mounting hardware so the⤠timer cannot vibrate loose during â˘operation.
- Power off: disconnect mains and lock out before touching wiring.
- Document âharness and âterminal â˘positions (photo⢠or diagram)⢠before removal.
- Confirm OEM part number â˘and shaft/terminal compatibility prior to installation.
- Transfer⤠wiresâ one connector at⣠a time and check contact continuity with âa multimeter.
- Perform an initial air-only cycleâ and visualâ inspection of contact operation âŁbeforeâ normalâ use.
| Item | Description |
|---|---|
| Terminal âblock | Individual output contacts that route power to motor, heater,â and âŁindicators â˘according to camâ positions. |
| Shaftâ and knob interface | Spline diameter and index position must match control panel knob toâ preserve cycle timing. |
| Compatibility âcheck | Cross-reference appliance model âŁand â˘wiring diagram with the 279737 part â¤numberâ to ensure correct mapping. |
Troubleshooting and Diagnostics: Multimeter Tests, Continuity Checksand Diagnostic âFlow Steps
The 279737 Whirlpool Dryer Load Timer is an electromechanical cam-style timer that sequences power to the drum motor,â heating âŁcircuit, â¤and other timed functions. The rotating cam stack closes and opensâ multiple⤠contact sets as the âŁtimerâ advances;â aâ failed timer âtypically presents as stuck cycles, no heator a dryer that will not advanceâ through â¤its cycle. â˘Contact⣠wear, pittingor âŁa seized cam âshaft âare common failure âmodes that produce intermittent â˘continuity or open circuits âat⤠the timer terminalsand âŁthose⢠symptoms should be distinguished from wiring harnessâ or safety switch faults during diagnostics.
- Safety first: ⢠always â˘remove mains power before continuityâ orâ resistance checks; measure live voltage only⣠when required and confident⣠in safe⤠procedures.
- Visually inspect the timer for burned âŁcontacts or broken actuator cams âŁbefore electrical testing.
- With âpower removed, use anâ ohmmeterâ to check continuity across âspecific timer contacts while manuallyâ setting â˘the â˘timer to the expected position for that âcontact.
- with âthe dryerâ powered and safe to probe, âverify expected AC voltage at the timer â˘input and switched outputsâ to confirm proper cam operation.
| Item | Description |
|---|---|
| Closed contact | Near⣠zero ohms (continuity)â between the contact pair⤠when theâ cam position should close that circuit |
| Open contact | High resistance⢠or OL (no âŁcontinuity) whenâ the cam position should leave⤠the contact open |
| Timer âŁmotorâ coil | Shows continuity (finite resistance) with power removed; motor not running⢠under power indicatesâ motor or supply fault |
Troubleshooting flowâ typically starts with confirming correct supply to the timer, then isolating the timer by checking continuity of contact sets in specific timer positions. For example, â¤ifâ theâ dryer does notâ advanceâ to â¤the next âtimed step but theâ motorâ runs, verify continuity across â˘the advancing cam contact; if⣠that contact âŁshows intermittent⣠continuity, the timer assembly should be replaced. When the â¤timer motor fails to run,measure the coil resistance and âŁverifyâ control voltage reaches the â¤motor under load-lack⣠of control â˘voltage points to upstream control or â˘safety interlock faults rather â˘than⢠the timer âmechanism itself.
Q&A
What is the Whirlpool 279737 â˘dryer load timer and âwhat does it do?
The 279737 is an electromechanical timer assembly used on some Whirlpool-family clothes dryers. It sequences the dryer’s cycle: it routes power âto the motor, heaterand various switches at the correct timesâ so the dryer advances through timed âcycles, auto-dryand otherâ selected functions. In short,â it acts as the mechanical⤠âbrainâ that stepsâ through the cycle positions.
What are common symptomsâ that the 279737â timer is failing?
Common symptoms âinclude: the dryer âŁknob won’t advance or the âcycle won’t âprogress; the dryer runs but never â¤heats; the timer motor â˘hums⤠or âdoesn’t turn; cycles stop in mid-cycle; or the dryer behaves inconsistently âŁbetween timer positions. As some â¤symptoms overlap â˘with otherâ parts (thermal⣠fuses, thermostats, motor), verify the timer with tests before replacing it.
How⤠can I confirm the 279737⢠is the correct replacement âfor âmy dryer?
Locate the dryer’s model and serial tag (usually inside the door opening⣠or on the back) and use that⤠model number with an âofficial whirlpool parts lookup, a reputable parts supplieror the dryer’s parts âdiagram.⢠Cross-checkâ the part numberâ listed in the diagram against 279737. âDo not rely solely âon visual similarity – confirm fit⣠and terminal/functions match the parts diagram or the vendor⤠listing.
How âŁdo I test the 279737 timerâ with a multimeter?
Always disconnect âpower first. Access theâ timer â˘wiring (consult the wiring diagram or âservice sheet). Tests include: 1) Check continuity âŁof the timer motor windings (should not be open). 2) Rotate theâ timer â˘knob and check continuity across âtheâ switch contactsâ for the â˘expected positions â˘(use the wiring diagram to knowâ whichâ terminals should be closed at each step). 3) With power appliedâ only ifâ you are qualified and careful,you can⤠check thatâ the timer motor receives 120VAC whenâ the timer is supposed to⤠advance. âIf âmotor â˘winding is open or⢠contacts do not change⢠state appropriately, the timer is defective.
Can I replace the 279737 myself and âwhat tools/steps â¤are required?
Yes, âŁa competent diyerâ can usually replace it. Basicâ steps: unplug the dryer, remove âthe control panel or consoleâ to access the timer, photograph or âlabel all â¤wire connections, remove retaining screws âandâ pull the âold timer⤠out, transfer the knob â˘or⣠shaft adapter if necessary, connect the new âtimer â¤usingâ the â˘same wiring, reassemble and test. Tools: Phillips/flatâ screwdrivers, nut driver set,⤠needle-nose pliers,⢠and optionally a multimeter. Keep safety âin mind and work with the unit unplugged.
How much does the 279737 timer⤠typically âŁcost and where⢠should Iâ buy â˘it?
Prices â¤vary but OEMâ timers in this category commonlyâ range from about $30 to $100 depending on source and⣠whether it’s aftermarket orâ genuine OEM.Buy from Whirlpool parts, authorized dealersor reputable appliance⣠parts retailers⣠online âŁto ensure correct fit â¤and âreturn policies. Avoid vrey cheap unknown sellers⢠unless you can return the part ifâ it’s⢠incorrect or defective.
What âsafety precautions should I follow when â˘working on the 279737 timer?
Disconnect the dryer from power before starting work. Label or photograph all wiring connections before⢠disconnecting. Avoid testing live circuits unless you⢠are experienced; if you must, â¤use insulated tools and⢠proper PPE.Be cautious⣠of sharp sheet-metal edges⢠and moving parts. If âyou âare âunsure, â˘hire a qualified appliance âtechnician.
If replacing the 279737 doesn’t fix the problem, what else should I check?
Check ârelated components thatâ affect cycling and heating: thermal⤠fuse, high-limit thermostat, cycling thermostat, heater â¤element/terminals, drive motor, door switch, selector â¤switchand âthe vent/lintâ blockage. Also verify wiring harnessesâ and connector continuity. Intermittent problems sometimes⢠point to loose connections rather than the timer itself.
In Summary
the 279737 Whirlpool Dryer Load Timer serves as a central âtiming control that â¤coordinates â˘the dryer’s âcycle functions, determining when heating, tumbling and sensor-driven sequences⤠begin âand end. As âa mechanical/electromechanical component it plays an vital⤠roleâ in ensuring consistent â˘drying performance, maintaining cycle timing accuracyand contributing to overall âŁappliance reliability âand energy use.
Because timer faults can â˘mimic other electrical or control problems,⤠accurate diagnosis is importent⢠before⢠replacing theâ part.â Proper testing-either by a qualifiedâ technician or through established troubleshooting⤠procedures-helps distinguish timerâ failure from issues with thermostats, âsensors, motor â¤circuits or wiring, preventingâ needless parts replacement and ensuring the rootâ cause is addressed.
When diagnosis indicates the â¤279737 Whirlpool â˘Dryer Load âTimer â˘is defective, timely⤠replacement with the correct component restores âintended operation, supports â˘safe performance, â¤and helps â¤extendâ the useful âlife of â˘the dryer.⢠Prioritizing correct identification, compatibleâ replacement parts and appropriate installation practicesâ yields the best outcomes for reliability and efficiency.
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