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Hi my name is Robert...
Do all the functions work when you turn the thermostat ON and when you turn it on does the thermostat still click?
IF you have good DC voltage and the noise is coming directly from the thermostat I suspect it is the problem. Check your battery voltage and make sure it is over 11 volts, sometimes low voltage can cause issues to various electrical components and if the unit sat it would be something to check out. IF the voltage is good and the noise is coming from the thermostat I would replace it.... Hope this helps some.... Robert
Hi... Was just checking in to see if my answer helped??? IF you have more questions or concerns please feel free to contact me....