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Discussion Starter · #1 ·
Pressure switch was closing then opening intermittently... Confirmed this with a multimeter checking continuity... After replacing I ran a heat cycle... Heating sequence ran perfect... inducer fan kicked on, satisfied the pressure switch... HSI began to glow... gas valve opened and burners fired... Blower motor kicked everything worked normal... now I turned tstat down to turn call for heat off... and waited... then I tried running another cycle and nothing happened... no inducer kicking on... nothing.
 

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You said that you turned it down then back up? Digital thermostats can delay, and newer furnaces will delay off also. Could be over a 10min delay combined. It's been several hours since you posted, has anything changed?

Cheers!
 

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Discussion Starter · #5 ·
I waited about 10 mins after blower motor stopped then turned tstat up in an attempt to run another cycle and got nothing. Trieto run fan only and nothing happened... went back in attic to check leds but there is no window so i removed cover taped down door switch and when i depressed door switch heat cycle began running again as if everything were normal... i allowed heat to run for about 10 to 15 mins then again stopped call for heat at tstat this time waited 15 mins after blower stopped running and turned tstat back up to call for heat and again nothing... all safeties are closed and like I said during heat cycle everything is working... there are 3 leds on board... normally 2 will be lit green... during heat cycle the 3rd one lights up amber... the amber one should turn off after heat cycle ia over but i noticed it is staying on... so heat cycle is normal but a second attempt to run heat cycle is no good but once I interrupt power to the board which resets it... heat cycle will work normally again... and heat sequence works normally with no safeties open.
 

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There should be a error code list written in SMALL print along the edge of the wiring diagram on the back of the blower door. Amber if I remember is the flame signal. Verify that.

If it is the flame signal and you are getting one when off then the flamer sensor is grounded or the wire shorted or the board is giving a false code and bad.
 

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Discussion Starter · #7 ·
Yup board was bad... replaced it everything working normally... but the board was expensive... it cost the customer $332 just for the board... not including labor... our cost was $200.
 

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Discussion Starter · #8 ·
Yup board was bad... replaced it everything working normally... but the board was expensive... it cost the customer $332 just for the board... not including labor... our cost was $200.
 
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