I do have AC so thanks for that tip. Just to make sure I understand, the AC evap coil being dirty could cause this to happen even when the AC is not running?
No hot air with filter in place
Hi, my forced air gas heater recently developed a problem. When I have a filter in, the heat will unpredictably stop heating and blow cold air instead. I read about this being caused by a dirty filter and when I took the filter out and reset it worked fine. However when I put a new filter in I have the same problem. I tried the least resistant filter, MERV 4 or 6, and still had the problem. With the filter now out it hasn't happened in over a month. I'd like opinions on whats wrong before I call a repair guy.
1 - 3 of 8 Posts
Update:
-Evap coil was clean and shiny, inside and out.
-All vents in the house are open and blowing air. I checked the crawl space for the bottom floor vents and none are collapsed/restricted. Upstairs go through the wall spaces so can't visually check those.
-The blower is clean and seems to be blowing a lot of air. I don't have a way to measure it so that's just a guess really.
One probably important detail I didn't connect to this before - a couple weeks before this happened I had a pretty strong smell of overheated/burnt electrical/electronics. No smoke, just that distinct smell. Never found the source but now thinking it might have been the blower motor seized/overheating.
Repair guy suggested putting the filter back in and checking for error codes the next time it happens, but no obvious cause/solution yet.
-Evap coil was clean and shiny, inside and out.
-All vents in the house are open and blowing air. I checked the crawl space for the bottom floor vents and none are collapsed/restricted. Upstairs go through the wall spaces so can't visually check those.
-The blower is clean and seems to be blowing a lot of air. I don't have a way to measure it so that's just a guess really.
One probably important detail I didn't connect to this before - a couple weeks before this happened I had a pretty strong smell of overheated/burnt electrical/electronics. No smoke, just that distinct smell. Never found the source but now thinking it might have been the blower motor seized/overheating.
Repair guy suggested putting the filter back in and checking for error codes the next time it happens, but no obvious cause/solution yet.
1 - 3 of 8 Posts
- This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
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