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| Joined: | Sun Aug 21st, 2005 |
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| Posts: | 8 |
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18 year old Payne furnace has worked fine all these years. All of a sudden - blowing cold, burners won't stay lit more than 4 seconds. I have bought new and replaced the control board (ie ICM271C). I have bought new and replaced the spark igniter (ie Carrier LH680512). I have shorted LIM1 and LIM2. I have confirmed ground to the chasis. I have replaced the batteries in the Honeywell thermostat.
Immediately after replacing the spark igniter, the burners came on for about a minute, but after that, we're back to 4 seconds, although the igniter now retains its red glow constantly when the thermostat is calling for heat. Sometimes, it's 25 seconds blower with no flame, and 4 second blower with flame. Other times, the blower shuts off, and flame on for four seconds. Unfortunately, the house isn't heating up above 58 degrees.
Any thoughts???