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No hot air with filter in place

386 Views 7 Replies 5 Participants Last post by  Spamoni
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.
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It’s not moving enough air, or the limit has become inaccurate.
It could have been right on the cusp of tripping for a long time and the limit just wore out.
Check airflow and gas pressure. Also check for closed vents, collapsed duct and dirty blower wheel/coils.
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