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You will need to determine what circuit the noise is coming from. Turn each switch on and off to see if something will affect the noise. Some relay may be malfunctioning. Like the horn relay, A/C Relay, Fuel Relay, Hazard light Flashers, or some heater control.
Heavy current required for instant hot water may be switched via a relay or contacter which may be faling. One way to diagnose may be with cover off and careful listening and visual inspection, but a risky process for inexperienced DIY'er's ??. Pro time?
When the door is open the safety switch turns off power.
1. low voltage transformer may be the culprit. Also a bad fan relay.
very carfully with door off off close safety switch with a insulated probe touch transformer and listen for the buzz.
2. with the transformers it can be a common problem. Check for loose mounting screws.
www.goodmancooling.com
A buzzing noise from your heater could be from a transformer or a relay or from the motor (which could mean a problem.) ------------------------------------------------------------------------------ fgtech galletto 2-master
When a start relay and the coil that opens the water for the ice maker or the water dispenser begin to weaken they some times buzz. Its possible you will need to either replace the=> 67003753 Water Inlet Valve
The buzzing noise was coming from the back of hte unit on the lower left side. It may have been a "stuck" switch & tapping on the side seemed to fix it.
Feel the outer cover at rear of the dryer at the bottom,if it starts to feel warm then the heater is working, the buzzing noise could be the motor trying to start, or noise from the relay, if the heater does not come on then could be timer faulty or faulty start relay. It is a a process of elmination.
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