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Estate dryer won't heat, all the thermosats and heating elements good
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Originally Posted by: denman OK I'm back
[COLOR="Blue"]The other side of the heating coil should be 0 to 12[/COLOR] I screwed up when I said the above. It should be 8 to 12 ohms.
[COLOR="Blue"]both sides of the operating thermostat contacts (outer two connectors) cycling thermostat (big red wires)[/COLOR] [COLOR="Green"]10-12 ohms[/COLOR] OK the 10 to 12 ohms is bad. So measure black to red at the timer but with the red wire disconnected. This should be 0 ohms as you as measuring across a set of closed contacts in the timer and have isolated it from the rest of the circuitry. If you still get 10 to 12 ohms then the contacts are bad and the timer needs replacing.
[COLOR="Green"](inner two are it's internal heater) purple wires( little) 1 of them 6-8 ohms the other is 0 ohms.[/COLOR] These also seems weird. Contacts BK to V should be open (infinite ohms) when in high heat. I hope I do a decent job explaining this. So using the wiring diagram. When your reference meter lead is on L1 then the current/meter circuit path is BK at the timer to BU since BK to V is open but BK to BU is closed in high heat. Then through the thermal fuse, through the motor windings to the right hand side of the thermostat heater (on the wiring diagram). This should measure about 1.5 ohms. This is the motor windings. On the left hand side of the thermostat heater you should see about 5,600 to 8,400 ohms.
[COLOR="Green"]both sides of the hi-limit thermostat 10-12 ohms one side of the heating coil both sides are 10-12 ohms[/COLOR] These two is what I would expect as you also saw this at the BK to red measurement.
[COLOR="Blue"]The other side of the heating coil should be 0 to 12 ohms both sides are [/COLOR] As I said earlier this is my error as it should be 8 to 12 ohms.
[COLOR="SeaGreen"]both sides are 10-12 ohms[/COLOR] Here we get weird again. Using the wiring diagram. You would expect to see 10-12 ohms on the left hand side of the element since even if it indicates a problem it is what you have seen in the circuit so far. But the right hand side should be the 10 to 12 ohms plus 7.8 to 11.8 ohms (the heater resistance) because that is now added to the circuit. Note the 7.8 to 11.8 is the 8 to 12 ohms that I mentioned earlier I just round it off to 8 to 12.
I hope that I have not confused the livin out of you. After a lot of years this stuff is second nature to me but I am not very good at explaining it.
So in conclusion I would say that the timer needs replacing. The heater not adding in when you checked it bothers me but I am at a loss as to why this is.
Before ordering a timer I would check the heating coil. Undo both wires at the heater. Then measure the heater it should be between 8 and 12 ohms. Then measure from each heater connector to the frame/case, both should measure infinite ohms. You are checking to see if the heater is OK and that it has not sagged and is touching the case which is a bad thing. I have to admit I am a little, actually a lot confused lol. But I will take my time and try to sort all of this out. If nothing else I will just order the timer and if that fixes it great, if not I can return it correct? And by the way I already took the heating element out and checked it. It was not sagging or touching the case, but when I tested it from lead to lead it was 0 ohms I thought that meant the continuity was good therefore the element was good is that not correct? I will let you know what I find after I check all of this out once again. Thanks very much.
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Joined: 2/29/2008(UTC) Posts: 19,638
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[COLOR="Blue"]I have to admit I am a little, actually a lot confused lol.[/COLOR] Sorry about that
[COLOR="Blue"]If nothing else I will just order the timer and if that fixes it great, if not I can return it correct? [/COLOR] Yes if it is ordered from AppliancePartsPros. They let you return electrical parts most other places do not.
[COLOR="Blue"]I tested it from lead to lead it was 0 ohms I thought that meant the continuity was good therefore the element was good is that not correct? [/COLOR] No. The element must have a resistance of 8 to 12 ohms.
One thing you have to watch out for when using a meter is the resistance scale. The lowest scale on my meter is 200 ohms so if you used this scale and got 0 ohms on the heater then it is bad.
But lets say you used the 20K ohm scale then it might show it as 0 ohms. Depends on the number of digits on the meter's display re: it is rounding off the reading to get it to fit on the display. |
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denman I didn't get a chance to look at anything on the dryer today. But I have a question, is there anyway to bypass the timer (just for testing) to see if everything else is ok ? Does the heating element run on 120? Could I fix a test wire and hook it straight to a 120 outlet to see if it works. Thanks.
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[COLOR="Blue"]But I have a question, is there anyway to bypass the timer (just for testing) to see if everything else is ok ? [/COLOR] There is a way to by-pass/jump the BK to R contacts on the timer. You would need stiff copper wire that is at least 12 gauge. And then short those two connections together. I do not recommend this because of the high current in the heater circuit. If the bypass does not make excellent contact it will overheat and then could mess up you connectors on the wires etc.
[COLOR="Blue"]Does the heating element run on 120? Could I fix a test wire and hook it straight to a 120 outlet to see if it works.[/COLOR] No The heating element runs off of 240 volts. |
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Originally Posted by: denman [COLOR="Blue"]But I have a question, is there anyway to bypass the timer (just for testing) to see if everything else is ok ? [/COLOR] [COLOR="Red"][/COLOR]There is a way to by-pass/jump the BK to R contacts on the timer. You would need stiff copper wire that is at least 12 gauge. And then short those two connections together. I do not recommend this because of the high current in the heater circuit. If the bypass does not make excellent contact it will overheat and then could mess up you connectors on the wires etc. [COLOR="Red"]OK I will try this. If this works does that mean the timer is bad ? [/COLOR] [COLOR="Blue"]Does the heating element run on 120? Could I fix a test wire and hook it straight to a 120 outlet to see if it works.[/COLOR] [COLOR="Red"][/COLOR]No [COLOR="Red"][/COLOR]The heating element runs off of 240 volts. [COLOR="Red"]Ok good to know that[/COLOR]
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denman, I took the timer apart and the contacts were burnt. Took some sandpaper and cleaned it up. It's working good now. Do you think this is a permanent fix or will it go out again shortly? One other question, before I took the timer apart I thought the problem might be that switch on the motor, so as I was checking it the little copper wire that comes out of the motor and connects to the switch broke off. Is there any way to repair this or is the motor trash? Thank you for all your time and help.
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[COLOR="Blue"]Do you think this is a permanent fix or will it go out again shortly?[/COLOR] Could last a week or years. I cannot say. A lot depends on how aggressive you had to be when cleaning them. If you can see arcing when they open then tey will n ot last long. [COLOR="Blue"] Is there any way to repair this or is the motor trash?[/COLOR] Sorry I cannot very helpful here either. Depends on where the wire broke. If it is lonk enough you could solder a wire extension to it. You just have to be sure that it cannot short to anything else so it has to be taped or heat shrinked. |
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Estate dryer won't heat, all the thermosats and heating elements good
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