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third PCB assembly, why isi it faling?

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Dryer Repair

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I have Amana electric dryer, purchased in 2009. Worked great until last October, had no heat. Would start, drum spun

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Old 05-12-2014, 06:40 AM
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Default third PCB assembly, why isi it faling?
Model Number: ned7200   Brand: Amana   Age: 1 - 5 years   

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I have Amana electric dryer, purchased in 2009. Worked great until last October, had no heat. Would start, drum spun and would complete time cycle, just not dry clothes. Investigated and found 240v heater relay on control board melted and smelled burnt. While I had it apart, I checked all components, including thermostats, thermistors, heater element, door switch, sensor. everything was okay. Unit ran for 6 months and last week found same problem, heater relay burned and melted, first inch of wire connected to relay burnt. Appliance pros warranteed the control board and I reinstalled. It ran for 5 loads on sensor dry, first load on time dry caused heater relay to burn up. All components are within spec, there are no shorts. What am I missing? Please help.


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  #2 (permalink)  
Old 05-14-2014, 06:25 AM
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I can only think of couple things.

1. Check your power to make syre that the unit is getting 240 volts.
Do this with the unit off and when it is running.

2. Unplug the unit and both wires at the heater.
Measure the heater, should be 8 to 12 ohms.
Then measure from each side of the heater to the case, both should be infinite ohms. If not the element is grounded and should be replaced.
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Old 05-14-2014, 07:47 AM
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Default No luck

Thanks for the input, heater is not shorted to ground. I have 9.7 ohms resistance. Input voltage is solid 242 v. No drop during 5 min run. All connections are tight at panel, receptacle and block.
Question back to you, how much resistance should a 6' dryer cord have? Prongs to lugs vary from 0.1- 0.3 ohms. Is it possible the dryer cord is bad?
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Old 05-14-2014, 04:46 PM
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Your cord resistance looks OK to me.

If you got the 242 volts at the unit's terminal strip when running the
n the power cord is good.
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