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Posted by Speedy Jim on January 29, 2008, 12:28 pm
jimwall2000@yahoo.com wrote:
> 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.
>
> The details:
> - 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 back
> 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
> repeats.
>
> Thanks for any ideas that I can try for myself.
>
> -Jim
That must have a separate flame-sensing probe.
The probe may need cleaning/replacement.
If the probe doesn't report correct electrical
signal from the flame ("flame rectification"),
the control will signal failure to Prove Ignition.
Jim
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