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I have an Admiral Dryer LNC7764A71 that went dead last week. I found the thermal fuse was blown (infinite reading). I replaced the thermal fuse and hi-limit. Unplugged the heating coil and it is reading 11ohms, checked coil to the case/frame and both were infinite (open). Belt and seals all look good. Removed ALL lint, dust, etc from the unit (blower wheel, vent system, etc. After replacing the thermal fuse and hi-limit everything started to work again. On fluff and delicate the temps seemed normal. When I switched to normal temp mode the coil seemed to get hot (to the point I could smell it and it was glowing)...power went off immediately after again...another blown thermal fuse! Hi-limit tested fine. Could I have a bad heating coil even though it's reading 11ohms (in spec)? Just a bad hi-limit? Any help is appreciated!
PS - also ordered a timer, and the wiring on it is a little different than mine. Not an electrician/EE (but work in electronics) so reading a circuit wiring diagram is proving a little difficult. I THINK I have everything plugged in properly, but not 100%. Got a picture of how everything is plugged into the timer? There was no paperwork with the timer. Didn't plug it in due to the difference in wiring. Could I have mixed a wire while ohming out the timer?
Thanks!
Darkside
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Post a copy of your wiring diagram. Did you do your testing with dryer fully assembled? If partially unassembled, you won't have proper air flow which could cause fuse to blow. Are you getting good air flow out the exhaust with unit fully assembled? It's normal for heat coil to get red hot. How long did it take for fuse to blow again?
Eric
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Rank: Member
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Unit was assembled when this happened. Unfortunately I didn't check the output from the exhaust. Found out from the wife that it went through a full cycle on delicate before this happened (when I left to pick up the kid)...lint in the catch so it had at least some output. Clothes still weren't dry so I switched to normal heat mode. Shutdown occurred in a matter of minutes. Thank you for any insight. Full wiring diagram pic is attached. Diagram on the APP website only shows half...figured you'd need it all. :) Added pics of the control panel/timer so you can see how everything is plugged in as well. DrkSdeOTM attached the following image(s):
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Rank: Advanced Member
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Timer is hooked up correctly. Overheating can be caused by improper air flow or the operating thermostat is faulty. That thermostat cycles on/off which turns the heat coil on/off to maintain proper temperature. Make sure the blower wheel is not slipping on the motor shaft which would cause reduced air flow.
Eric
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After replacing the parts I did notice the dryer was running quieter so I will check the blower. Lint was in the trap so I know it is turning at least to some degree. Cleaned out all the lint in and around the blower, so there should be no obstruction of airflow. I noticed the thermostat turning on and off when in normal temp mode...glowing then shut down, repeat. Not sure if it's possible that it could still be defective? Checked for continuity on the two outside posts of the thermostat when trying to figure out the issue. When new thermal fuse gets here I will fire it up without the front of the unit on and check speed of the blower. The fact that the hi-limit did not shut down preventing damage to the thermal fuse is what has me confused. Sounds like a faulty hi-limit to me? Would you agree, provided the blower is spinning properly? Routed belt correctly, drum turned freely, all seals looked good, etc. THANK YOU SO MUCH for you prompt responses!
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Rank: Advanced Member
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Yes, the hi limit thermostat should open at around 250° while the thermal fuse should blow at around 300°. If the operating thermostat is good and air flow is good, then the hi limit should never cycle. Sounds like the operating thermostat is working but we don't know at what temperature. You said you replaced the hi limit so it appears to be either an air flow problem or the operating thermostat.
Eric
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Rank: Member
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Will check air flow when new hi-limit and thermal fuse arrive (hopefully sometime soon next week). Will check blower, and all seals again after installation. If getting the same results will order an operating thermostat, and hopefully the issue will be resolved. I'll report back on my findings. Thank you again Eric.
Joe
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