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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I have an American standard Freedom 90 furnace. Over the

Customer Question

I have an American standard Freedom 90 furnace. Over the last day or so it has quit running it is trying to start up and the green light is blinking but then it stops trying to start and the red light blinks 3 times.
JA: Did you check the furnace's filters?
Customer: I changed it just now
JA: Do you plan on doing the work yourself?
Customer: if its not past my skill level lol
JA: Anything else we should know to help you best?
Customer: no
Submitted: 10 months ago.
Category: HVAC
Expert:  Phil replied 10 months ago.

Hello, does flame appear for even a few seconds before it stops and blinks 3 times? If so, the problem is most likely with the flame sensor rod, simply cleaning it often solves the problem.

If no flame ever appears the problem is either a bad gas valve (5% chance) or a bad glow plate type igniter (90%)..

Let me know, we can go from there.