Hi Everyone, I have a question. I have a Honeywell Chronotherm III
with a heatpump and a gas furnace for backup. The last couple of
nights we have had sub-freezing weather here so the furnace has been
active. I normally place the fan in the "on" position so the
electronic air cleaner can do its job. The last two nights the fan
has only come on when the furnace kicks in. If anyone has any ideas,
I look forward to hearing them. Thanks in advance for your help.
Same set up that I have, Check the sub base wires and then reseat the tstat.
Look for corrosion on the terminals that do the electrical connections on
the tstat. Verify that it works or does not. Might be time to call someone.
I agree it might not be in the tstat.
I appreciate your help. If it isn't the thermostat, what else should
I be looking for? The fan works fine when the heat kicks in, whether
the tstat is in the on or auto position. Do you have any ideas on
what the best and worst case scenarios would be? I assume dirty
contacts would be a best case. ONce again thanks for all your help.
I appreciate it.
Its like this...
Heat pump with gas second stage..EVERY one I have EVER wired works like
Heat pump is running,...seconds stage is called for, the entire unit shuts
down, and the gas unit fires, and when temp is reached or the timer expires,
the unit starts again, and the heat pump will start back up when the gas
unit is running, and all shut off when setpoint reached.
This is due to the fossil fuel switch wiring...
Now..since in a case like this, the thermostat is nothing but an off, and on
switch, and with a gas furnace, there are two sets of controls for the
fan...umm...sounds like ones not working.
Also, since you have given no information to go on, it would be damn hard to
tell you whats wrong, other than what you have been told.
99% of the time, its not the thermostat, altho Home Depot, and Lowes would
love you to think otherwise.
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