Hopefully someone here can give me some ideas on what might be wrong
with my Day and Night heater (about 10 years old). Every few days it
fails to come completely on and it flashes a Ignition Proving Failure
warning message. But the other 98% of the time it works perfectly.
- It seems to do this in the early morning when it is changing from
the lower night setting to the higher day time setting.
- Removing power to the heater, waiting 5 minutes and turning it
on seems to always fix the problem (based on three to 5 times)
- The thermostat was replaced and did not fix the problem
- The sequence is: low speed fan comes on, electric igniter glows,
gas jets are ignited, a few seconds later the gas is shut off, error
message flashes, fan continues to run for a while, then the sequence
Thanks for any ideas that I can try for myself.
Did you have a reasonable cause to replace the thermostat?
First, up front what is your furnace make and model?
Think logic. After ignition, it is time for the flame sensor to
tell the logic board the flame is on. So what do you think.
If all the logic flow is not correct step by step, furnace shuts off
for safety. When turn the power off/on, you are resetting the logic.
Or it'll reset itself after fixed number of hours.
BTW, no diagnostic code when it is acting up?
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