Posted: 11/29/2012 10:39:19 AM EDT
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For the last few years I've been having intermittent issues w/ my furnace, and have had repairmen out 3 or 4 times over the last 3 years. First time the guy found a vacuum leak, said that was the problem. Second guy said it was because I was using 3M allergy filters and the resistance was too high. Third guys said the problem was in the thermostat and replaced my thermostat. In all cases the problem was alleviated only to return in the future.
The problem is intermittent, but usually after the thermostat has been sitting at low temp for awhile (ie, at night or while we're at work and have the t-stat down to 63 or 65.) The furnace blower will turn on, the igniter will heat up, the furnace will kick on, then it will over-temp (or something) and kick off the gas. Some times the blower will kick off and the cycle will start again, other times the blower just keeps on blowing. The result is (at least the last two mornings) that I wake up and its 60 degrees in the house instead of 68, and as bitchy as I can be on a cold morning, its nothing like my wife!  I've also come home 2 of the last 3 nights to a cold house (and surprisingly not a bitchy wife!)
To solve the problem, I turn the t-stat to "off" for 30 or so seconds, then turn it on and all is good for the night (or morning before I leave for work). So, any ideas on what to look for, because apparently the three tech's I've had out don't have any ideas. I'd much prefer to not purchase a new furnace until this one kicks the bucket. It was new w/ the house in '94, but I'd prefer it to die, not be sent off to pasture. K |
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First, we need to know what we are dealing with.
Pictures are worth a thousand words. The more pictures you can provide the better, unit ID tags, venting, duct work, filters, A/C stuff, T-stat, anything you find odd like wiring, etc... Second, if it's a newer furnace it will have a diagnostic light somewhere in or on the unit, usually in the blower compartment on the main control board. We need to know the exact diagnostic the unit is tripping on. It will usually be a series of LED flashes, or it could be a LED number. The shackle sheet for the code will also be located somewhere in or on the unit. Ex. 4 flashes = Open pressure switch. 5 flashes = Ignition failure. If you can gather up some pics or video and the exact fault we can troubleshoot this much more precisely. Right now with the info given we are only throwing darts. |