Tempstar 90 EFI will not start up (Exhaust Fan)

Old 04-10-11, 06:56 AM
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Tempstar 90 EFI will not start up (Exhaust Fan)

Yes Hello. looking for help my tempstart furnace will not turn on when I turn the thermstat up. Model N9MP1075B12A3 Also they had to install a new honeywell smart valve about 2 years ago. SV9641M4510 if I pull one if the red wires off any of the sensers both the exhaust fan and blower motor start up. After alittle bit it shuts down and the green light gives me 2 blinks. Ive checked the presure switch and it im checking it right it seems to be working correct any ideas thanks.
Old 04-10-11, 11:43 AM
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check for 24V between W and C at the control board....have you checked the batteries (if applicable) in the thermostat?

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