DIYbanter - View Single Post

wrote:
Yesterday, I noticed that the clicking sound corresponded to an
indicator light on my thermostat. The light is labeled "Aux Heat", and
when the heater is clicking away, the light is blinking away, turning

Sounds like a problem we had. The relays for the auxillary heat are
going bad (or the contacts are dirty) and this is causing the chatter as
it keeps trying to lock on. Aux heat will be used during the defrost
cycle of the heat pump. This is a normal operation that happens every
so often (some pumps have timers, some have sensors to detect frost
buildup).

You need to have a heat pump specialist check the relays and either
clean or replace them. At the same time he can determne if this IS
really normal or if there is something else wrong.

Mark in Cincinnati