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AMarkham40  
#1 Posted : Saturday, December 10, 2016 11:18:39 AM(UTC)
AMarkham40

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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.
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ThatGuy  
#2 Posted : Saturday, December 10, 2016 11:36:21 AM(UTC)
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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.
AMarkham40  
#3 Posted : Saturday, December 10, 2016 11:47:44 AM(UTC)
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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.
ThatGuy  
#4 Posted : Saturday, December 10, 2016 12:03:41 PM(UTC)
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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.
ThatGuy  
#5 Posted : Saturday, December 10, 2016 12:19:28 PM(UTC)
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Boy, you can tell I haven't done this in awhile. You probably have a bad cycling thermostat.

Whirlpool WP694674 Adjustable Dryer Cycling Thermostat - AppliancePartsPros.com

Also check the bias heater under it. It should be around 3240 to 3960 ohms. I have no idea why they are calling it a thermostat.

Whirlpool WP61894 Thermostat - AppliancePartsPros.com

It could just be the bias heater causing the problem.
AMarkham40  
#6 Posted : Saturday, December 10, 2016 12:35:27 PM(UTC)
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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!
ThatGuy  
#7 Posted : Saturday, December 10, 2016 1:52:37 PM(UTC)
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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.
AMarkham40  
#8 Posted : Saturday, December 10, 2016 2:24:30 PM(UTC)
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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!
ThatGuy  
#9 Posted : Saturday, December 10, 2016 2:41:46 PM(UTC)
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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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