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Trying to troubleshoot an old Whirlpool dryer. The timer will not advance in Auto mode but the timer works fine in Timed Mode. The dryer is producing heat in both modes. I have made sure the dryer is free of any lint. I tested the resistor going to the auto timer & it measured around 4400 ohms which tells me the resistor is fine. Where should I look next? I attached a picture of the wiring diagram on the back of the dryer. AMarkham40 attached the following image(s):
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Rank: Advanced Member
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Joined: 7/27/2010(UTC) Posts: 1,395  Location: near the middle of nowhere Was thanked: 24 time(s) in 24 post(s)
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You need to check the timer. See the part of the wiring diagram that says "timer schedule in minutes" ?
Notice the auto cycles have something the timed doesn't. TM to RS1
So with the dryer unplugged and the timer set in about the center of an auto cycle, you should get a continuity reading through TM to RS1. Check with the wires off the terminals to make sure.
If you don't then the timer is bad.
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Ok, I checked continuity across TM to RS1 in Auto Mode & Timed Mode. In Auto Mode my multi meter beeps showing continuity. In Timed Mode it showed no continuity. I then tested TM to CS while in Timed Mode & the multi meter beeped showing continuity. I'm guessing this is correct.
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Rank: Advanced Member
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It should be.
The timer terminal RS1 goes to one end of the resistor. The other end of the resistor goes down to the same wire that goes to H1. Which is one side of the heater element.
Check for bad or broken connections. You said it was heating in auto, so voltage has to be present.
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Rank: Advanced Member
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Joined: 7/27/2010(UTC) Posts: 1,395 Location: near the middle of nowhere Was thanked: 24 time(s) in 24 post(s)
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I checked the bias heater earlier & it was around 3600 ohms. Where on the diagram is the cycling thermostat? Thanks for all your help!
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Rank: Advanced Member
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Joined: 7/27/2010(UTC) Posts: 1,395 Location: near the middle of nowhere Was thanked: 24 time(s) in 24 post(s)
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The cycling thermostat also known as the operational thermostat is shown as "oper. stat" on the diagram.
Also check Y to RL on the timer. They power the bias heater under the oper, stat.
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I removed one of the leads from the cycling thermostat & started the dryer (simulating an open thermostat). With the lead removed the timer was advancing in Auto mode. I will try & replace the thermostat next week. Thank you again!
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Rank: Advanced Member
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Joined: 7/27/2010(UTC) Posts: 1,395 Location: near the middle of nowhere Was thanked: 24 time(s) in 24 post(s)
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Check that the bias heater is getting 120 volts from the timer. That heater heats the oper. stat so the clothes can dry at a lower temperature and the timer will advance more often in an auto cycle like permanent press.
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