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Every time the immersion heater comes on, the circuit breaker in the consumer unit starts buzzing loudly. Is the breaker faulty?

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Are you sure its a breaker and not the contactor stuck ,when you call for the heat to come on the contactor pulls in and over time and wear and tear the contacts get stuck

Posted on Nov 16, 2008

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Take a look at this YouTube page that explains with good videos what are some of the common problems with heat pump noise. The one that seems dominant is the defrost cycle a heat pump goes thru when it melts ice off the evaporative coils. In defrost cycle, The compressor runs but the cooling fan does not, so you will hear a loud buzzing sound and the unit sounds like it is stalled...because only the compressor is running to generate heat to melt coil ice.

https://www.youtube.com/results?search_query=American+Standard+5000+Heat+Pump+makes+a+buzzing+noise
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1 Answer

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