Trane XV80 No Heat/ No Gas


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Old 11-18-11, 03:09 PM
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Trane XV80 No Heat/ No Gas

Have a Trane XV80 gas furnace. The Red light flashes 2 times indicating external lockout retries exceeded and the switch on it is ON.
The heat blower runs, the igniter glows, the safeties (5) are all good but the gas valve does not open. The unit shuts down after a few seconds then tries again, then after the third try the fan blower starts and runs with no heat. The coil on the gas valve will pull in if you jump it out, so it is not the gas valve. The 2nd stage pressure switch doesn't have 24 volts, but I believe that is normal on startup ? So what is keeping the control board from operating the gas valve?
Pretty sure its the board, but don't want to be wrong $$$

One other clue a green led keeps flickering 7 times on lower right of the board, but can't find any documentation on green LED's.
 
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Old 11-18-11, 07:03 PM
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Yep. Bad ignition control.
 
 

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