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Customer Questions and Answers for High Limit Thermostat by Whirlpool

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    • Part Number: AP4036956
    • MFG Part Number: 303395
    • Made by: Whirlpool
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Questions & Answers

For Whirlpool High Limit Thermostat (Part Number: AP4036956)

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My dryer is not heating. I checked for the igniter and it heats up fine but no flame ignites. I am assuming I need both coils. Also when it was working properly the clothes seemed to be extremely hot sometimes. I am assuming this may be the high limit thermostat. Please advise. Andrew

Andrew for Model Number LDG7304AAE

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I just replaced the coils. Could the new ones be bad. If so, can I return them?

Jim C. for Model Number MDG500AWW

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Yes I have check all the sensors and they test good. I disconected the dryer vent hose and I get plenty of air flow but the gas still shuts off after a few seconds. My son said that he had the same problem and he change the ingniter and that corrected the problem. I am sorry to be such a problem, but am stuck as what to do.

Jim C. for Model Number MDG500AWW

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I tested the hi-limit thermostat and the regularing thermostat and they both tested good. Could they still be bad or can there be something else.

Jim C. for Model Number MDG500AWW

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Maytag. Dryer not heating at all. When start dryer first coil fires however igniter not glowing. Removed ignitor to test and broke ignitor. Replaced ignitor with new. Removed wires from radiant sensor to test continuity and found No continuity on radiant sensor. Jumped out radiant sensor which turned on ingnitor but no gas and no noise from other coil. Both coils read resistance. Any clues?

Steve L. for Model Number dg7400

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To Recap my original problem was related to the lowcycling thermostat not letting the timer advance in the more/less mode (AP4290671) was replaced and the situation corrected. Now it has developed a problem with the flame staying lit long enough to get the dryer hot. I have replaced the main and secondary coils (AP3041625 and AP3041626), the flame sensor (AP2910747) and the flat style ignightor(AP3109449) with no improvement. the sequence is as follows 1.A coil energizes 2. the ignighter glows orange-yellow 3. the gas coil opens and the flame is on for a duration of approximately 10 seconds the first time then goes out. I hear what sounds like a reset click about 30 seconds after the flame went out. Then 30 more seconds later the cycle repeats only the flame stays on for just 5 seconds from there on out. I observed that the edge of the yellow gas flame is lightly washing over the igniter if that matters. When I jumper across the terminals on the highlimit thermostat the flame stays on until I remove the jumper. If i remove eather of the wire clips from the high limit thermostat the flame goes out. The only thing left unchanged is the high limit thermostat (AP4290671). I've checked all the connections and they're good. The only thing left to try based on other suggetions by your staff is to maybe swap the secondary coil again? Should I replace the high limit thermostat(AP4036956)? If so I may as well change the low cycling thermostat then everything will be new. Any suggetions, I'm stumped. I supose the high limit thermostat opens when it gets to hot(normally closed?) but should that happen so quickly? I think i'll button it all back up and try it with the front back on perhaps the flame shape is odd with the front off maybe? I grabbing at straws now. HELP!! Thanks in advance

Gil for Model Number DG612 Series 5 SN 252995VJ

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Hello, DG612 Series 05 SN 252995 VJ Where can I find a wiring diagram or schematic for a DG612 or any other gas dryer of similar configuration. I suspected the scheme is consistent across all “brands” and models. This would sure make it simpler to understand what the interlocks logic is for the dryer. I too am having a problem with the temperature control of my dryer. First the dryer failed on the “more”/”less” dry cycle. The “timer” stopped advancing so the low cycling 304475 Thermostat L140 - 20F sensor was replaced. The problem was solved. Now I am having a similar problem again but this time there is little or no heat in the dryer as opposed to full capacity hot before. and we’re back to a pure timed cycle again. I opened the burner observation porthole and observed the following: 1 the dryer called for heat 2 the igniter heated up and glowed bright orange/yellow 3 The gas Solenoid clicked open allowing the flame to come on 4 The flame stayed on for approximately 5 seconds then the solenoid tripped out and shut off the gas. 5 The ambient temp in the dryer was only slightly warmed and it continued to run. 6 After a short lapse of time the igniter actuated again and glowed, then repeated steps 2,3&4 7 This continued over and over. Hence the warm dryer and very long drying cycle plus the high temp timer limit not advancing. 8 Per previous recommendations on this site I replaced the two coils on the valve assembly. 1 two Prong and 1 three prong (AP3094251 (279834)) 9 The problem continues steps 2,3&4 10 I watched for a few cycles of flame on and out and tried a jumper across Dryer high limit thermostat. L220-40F (AP4036956) after the flame came on (step 3 above) and the flame held. When I removed the alligator clip from one terminal the solenoid closed and the flame went out. I’m not sure what the logic is but a previous response was that the Flame sensor AP2910747 (338906) is bad. I ordered and received the igniter AP3109449 (4391996) and flame sensor. So the next step would be to replace the Flame Sensor. If that fails should I then replace the igniter or the High limit thermostat (AP4036956 ) ? Thanks

Gil for Model Number Maytag DG612 Series 05 SN 252995 VJ

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Purchased and replace coils per on-line review and discussions with similar problems. My vent is short and clean. Dryer fires up but flame shuts down after 5-10 seconds. It continues to cycle doing the same if I let it run. Any thoughts on the problem?

Henry for Model Number LDG8604AAE

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Turn dryer on, flame initially comes on for about 10 sec then cuts out and cycles on and off. If I jump the terminals of the high limit thermostat L220-40F, the flame will stay on. Should I replace the thermostat or do you think I have another problem?

David From Nyack for Model Number LDG7334AAE

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Will the flame come on initially if the hi-limit thermostat is bad?

David for Model Number LDG7304AAE

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