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Bosch WTMC3510UC Gas Dryer - Page 4 Questions & Answers
Bosch gas dryer WTMC6550 making humming sound
Gas appliances often have a gas controlling solenoid valve. This will hum if the armature does not fully close, or if something becomes mechanically loose on the solenoid. I have had both faults at various times with a gas heater (which is the same thing as a dryer but without a rotating drum!)Can also hum at mains frequency if it is seeing a too low voltage, and the armature is partially releasing each half cycle. Some (but not many) appliances use a DC solenoid, and a little bridge rectifier and capacitor to smooth the resultant DC. If the capacitor fails you will also get hum. That is a 20 cent fix once you prise open any encapsulation of the rectifier/capacitor assembly. Watch out though, solenoids can be low voltage and isolated from mains, or use mains voltage coils...ouchh + dea.h. (Weird - the forum blocks the word for mortality for some reason)Whatever, I lay odds it is something to do with the solenoid and you will have an easy diagnosis and an easy fix once you can get close enough to the solenoid.CAVEAT: Unless you are familiar with the terms I have used please get someone who is electronically aware to assist you.
2/3/2018 7:13:09 AM •
Bosch Dryers
•
Answered
on Feb 03, 2018
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