Why is my thermostat buzzing?
June 3, 2011 5:22 PM Subscribe
I just installed a digital thermostat for the evaporative cooler in our house. Works great, hi/lo, pump, fans, etc., but there is a very low buzzing coming from the thermostat when the evaporative cooler is running. When the thermostat is in "standby" (just showing the ambient temperature) it does not make any noises. It is definitely coming from the thermostat and not any nearby location. Any ideas why this is happening? A defective unit? Weird house wiring? Thanks!