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bradford0113  
#1 Posted : Tuesday, January 26, 2016 6:08:16 AM(UTC)
bradford0113

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Posts: 3

I have been reading many threads online regarding the issue of my dryer stopping mid-cycle but cannot find a resolution.

I believe I have correctly tested the start switch, door switch, thermal cutoff, thermostats, and timer and all seem to be functioning correctly.

The dryer will operate (with heat) for a period of time (typically 10-20 minutes) but will then just shut down. I can immediately press the start button and the dryer will operate right away so I do not think it is a problem with the motor overheating. The problem only seems to occur on auto and times cycles. If I run the no-heat cycle, it does not shut down before the end of the cycle.

Any ideas?
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denman  
#2 Posted : Wednesday, January 27, 2016 4:24:24 AM(UTC)
denman

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Here are your parts
Parts for Roper RES7745PQ0 Dryer - AppliancePartsPros.com

See the attachment for the wiring diagram.

This is a puzzler.

Did you have clothes in the unit during all tests?
The reason I ask is that perhaps that perhaps due to a bad door latch or door switch clothes open the switch turning the unit off.

Unplug the unit and check all connections in the motor circuit path.
Perhaps there is a bad/loose one and heat is expanding it and opening the circuit.

Other than that perhaps it is the start relay but I do not know why heat is affecting it.

I am assuming that the unit stops at different points in the heating cycles.
File Attachment(s):
RES7745.pdf (190kb) downloaded 3 time(s).

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bradford0113  
#3 Posted : Wednesday, January 27, 2016 4:56:03 AM(UTC)
bradford0113

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Thanks denman for taking the time to respond.

I already have a copy of the schematic and I have tested every part in the diagram to the best of my ability and everything seems to test okay.

I was starting to think that something may be wrong in the timer switch but I am not sure how to test all of the contacts for all of the various timer positions. Obviously, I am getting continuity between BK-BU since the motor is running, but as you state, something in the motor circuit is causing it to shut down prematurely.

Since I suspected something with the timer, I opened it up to observe the contacts. I noticed that the T-W contacts are burnt and pitted really bad. However, I am having trouble understanding the schematic in regards to the T-W contacts to know if they could be the culprit of the motor turning off after a period of time.

Does anyone know how the T-W contacts operate in the motor circuit and/or if they could possibly be causing my problems?

thanks...
brad
denman  
#4 Posted : Wednesday, January 27, 2016 7:19:11 AM(UTC)
denman

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They are for wrinkle guard.
At the end of a cycle they turn the motor on every once in a while.
This helps prevent wrinkles in the dry clothes.

I could not find info on how often and for how long this happens on this dryer.
I could not even find out if it occurs in both timed dry and auto cycles.
But the timing chart does show them as closed intermittently.

Since they are badly pitted you may have found the problem.
bradford0113  
#5 Posted : Sunday, January 31, 2016 2:12:01 PM(UTC)
bradford0113

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This issue has been resolved. After continuously troubleshooting the problem for over a week, one day the dryer would not start at all. Found out that one leg of the incoming power was only getting 42 volts. Replaced the double pole 30A breaker in the main control panel and the dryer now runs fine. The faulty breaker must have been intermittently supplying low voltage causing the motor to turn of mid cycle.
denman  
#6 Posted : Monday, February 1, 2016 1:23:19 AM(UTC)
denman

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Joined: 2/29/2008(UTC)
Posts: 19,638

Congratulations
This was a great bit of detective work on your part.
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