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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 5648
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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My furnace isnt heating
, i set the thermostat and it

Customer Question

Customer: my furnace isnt heating
JA: Thanks. Can you give me any more details about your issue?
Customer: i set the thermostat and it wont heat, it's a American Standard Trane Furnace (AUC1B040A9241AD) the light on the circuit board is steadily blinking (quickly) and the flame doesnt seem to be igniting
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Submitted: 11 months ago.
Category: HVAC
Customer: replied 11 months ago.
I just bought this home and one of the items on teh inspection report was condensation in the furnace. There was a trail of fluid coming from the unit upon inspection but hasnt been there in the last 3-4 weeks. When I open the control panel there is a small amount of condensate in the bottom.
Expert:  BillyHvac replied 11 months ago.

hello,

before we get to deep...does your thermostat require batteries?

Customer: replied 11 months ago.
but seems to be working fine
Expert:  BillyHvac replied 11 months ago.

the blinking light is normal for the american standard/trane....when this happens is the exhaust fan running?

Customer: replied 11 months ago.
no fan starts when powered on. I can use the thermostat to turn on the fan from the house
Expert:  BillyHvac replied 11 months ago.

thank you,

do you mind removing top section of thermostat for a test?

Customer: replied 11 months ago.
ok
Expert:  BillyHvac replied 11 months ago.

locate R and W....remove those 2 and twist together. Tell me what furnace does and code (blinks)

Customer: replied 11 months ago.
twisted, no R but an RH. Its a fast steady blink, same as before
Customer: replied 11 months ago.
furnace is doing nothing
Expert:  BillyHvac replied 11 months ago.

Thank you....now do you mind going to furnace for a similiar test?

Customer: replied 11 months ago.
there now
Expert:  BillyHvac replied 11 months ago.

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.

Customer: replied 11 months ago.
blower does start when I do that
Expert:  BillyHvac replied 11 months ago.

Thank you.

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?

Customer: replied 11 months ago.
one end runs to the thermostat and the other to a condensate pump that is empty
Expert:  BillyHvac replied 11 months ago.

thank you,

can you remove the wires from the pump....and just attach the wires direct together as if pump was not there?

Customer: replied 11 months ago.
its pretty well insulated and looks soldered. is there an alternative?
Expert:  BillyHvac replied 11 months ago.

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 ?

Customer: replied 11 months ago.
Picture attached
Expert:  BillyHvac replied 11 months ago.

I am sorry but I do not see pic...did you use the paper clip or attach files link?

Customer: replied 11 months ago.
How about now?
Expert:  BillyHvac replied 11 months ago.

I apologize as I was offline today. Do you still have an issue or did you by pass the pump?

Customer: replied 11 months ago.
I was able to bypass the pump but it doesn't seem to have fully resolved the issue. Lots of condensate inside the unit and intermittently responding to thermostat control.

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