Originally Posted by kennzz05
i just reread your post why not swap the seq. make the one that didnt used to control the fan now run the fan
and the one that ran the fan b4 use that for second stage
Thanks for the info. It does seem to operating in the mean-time.
With the system as it is now, I have to manually rewire the fan to High when I want to run on A/C in the summer.
To address your question, my reading of the circuit diagram is that, wth the system wired for single stage, either heater sequencer 1 or 2 (TDR1 or TDR2) should make the fan come on. Since it doesn't do this, both must be bad. I just moved in here over the summer, and maybe one of the sequencers has been busted for ages.
I want to upgrade to a two-stage thermostat since this is suppose to save energy (I'm not sure about how much). If I want to avoid rewiring for the summer months, I need both sequencers to work, otherwise one would do.