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when you say blower fan...is it the exhaust fan that kicks on?
have you checked the limit?
Do you have a voltmeter if needed?
was the filter plugged when this occurred?
Do you have a meter too see if we have 24v to and from thermostat?
we have 2 different voltages...120v for the blowers...and 24v for the controls and thermostat.
This is done with the transformer. The main blower will run if transformer is bad.
we know the following:
blower motor works
new ignition control
this leaves the control circuit created by the transformer.
see page 5 HERE
We could verify if you had a meter...but with the other items confirmed it leaves very few choices..which the transformer is #1
you are very welcome,
If all set for now rate service and I will be available for follow up for 30 days.
If you have not a volt meter to test the transformer you do not need one, you can check a couple things at the control board to verify that instead of just replacing the transformer. If you need anything else just let me know.
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