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Old 12-24-2008, 10:17 AM   #1
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Ruud Achiever 90+ not Satisfying Thermostat


My furnace seems to run normally for several minutes, but then stops before achieving the set-point of my thermostat. It will then stay shut down for more than an hour unless I cycle the thermostat or breaker power. I replaced the thermostat a few weeks ago hoping that was the problem, but there's been no change in the behavior of the furnace. I changed the accordion filter, which was pretty dirty but not opaque. I have also cleaned the flame sensor of my furnace with emory paper, but the problem persists.

Here's the sequence:
1) Blower starts
2) Almost immediately, flames light and go off in less than a second
3) After about 3 minutes, flames light again and stay on for about 15 minutes
4) Flames go out for about 2 minutes
5) Flames fire for about 5 minutes
6) Flames go out for 2 minutes
7) Flames restart for less than a second, and this repeats twice
8) The blower continues to run for several minutes
9) The system shuts down

I don't know how long this problem has existed, because it's only recently gotten cold enough to make a difference here. Previously, the 15 minute burn cycle was probably enough to satisfy the thermostat and I would not have noticed this issue.

I'm a novice when it comes to HVAC, so any and all detailed troubleshooting solutions would be very welcome.
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Old 12-24-2008, 06:35 PM   #2
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Ruud Achiever 90+ not Satisfying Thermostat


Could be as simple as a dirty filter, a/c coil and a dirty flsme sensor.

Last edited by SKIP4661; 12-24-2008 at 06:36 PM. Reason: skip
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Old 12-24-2008, 06:46 PM   #3
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Ruud Achiever 90+ not Satisfying Thermostat


Thanks for taking the time to reply, SKIP4661. Since I've already replaced the air filter and cleaned the flame sensor, could you tell me more about the A/C coil? How can I tell if that's the problem? Is that something I would clean, repair or replace? How would I go about identifying and addressing that?
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Old 12-24-2008, 07:27 PM   #4
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Ruud Achiever 90+ not Satisfying Thermostat


Sometimes the upstream side of the coil will become restricted from dust and lint build-up. If you can access the coil remove the end plate and inspect the coil.
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Old 12-26-2008, 10:20 AM   #5
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Ruud Achiever 90+ not Satisfying Thermostat


had the same problem flame kept going out after burning for 20 sec,or 30 sec or 45 sec, or maybe a minute everything else seemed ok fan etc. what it was , it was a tube plastic vacumline from a switch elec , above the little exhaust blower motor thats above the burners for the exhaust blower it was kinked a little too much . take the tube off the blower side , suck on it you should hear a clik clik inside the elec switch make sure the vacum tube is clear of dust etc then try your furnace that sure fixed mine! good luck.
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