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before we get to deep...does your thermostat require batteries?
the blinking light is normal for the american standard/trane....when this happens is the exhaust fan running?
do you mind removing top section of thermostat for a test?
locate R and W....remove those 2 and twist together. Tell me what furnace does and code (blinks)
Thank you....now do you mind going to furnace for a similiar test?
remove doors....tape safety door switch down.
Locate thermostat wires that attach to same type terminals as thermostat.
Use a paper clip or wire shaped in a U.....hold one end on R and the other end on W....tell me if exhaust fan starts.
Now we have something between the furnace and thermostat that is holding off operation. We just did a direct bypass to furnace and it checked ok. The wire from R in furnace is our concern...we could have a safety switch (water safety like a pump) or the possibility of a bad thermostat wire.
Can you tell me what the R and W wire run to?
can you remove the wires from the pump....and just attach the wires direct together as if pump was not there?
the pump safety should be wire nutted and not soldered. Heere is what we know....the furnace works fine when thermostat wire bypassed.
That means something between the furnace and thermostat is wrong. Thermostat wire or a safety...
can you post a pic of the pump ?
I am sorry but I do not see pic...did you use the paper clip or attach files link?
I apologize as I was offline today. Do you still have an issue or did you by pass the pump?