fan on propane furnace turning on and off continualy?
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i have a propane furnace, has been turned down for weeks now so it would not go on, today the blower started turning on and off continualy and I dont know why, tried turning off breaker but furnace area got quite warm, turned breaker back on and blower is still going on and off, never had this problem before and cant afford a service man, need help please, thanks
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Tagged with: propane furnace • service man
Filed under: Furnace
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I need to know how old this furnace is and how its installed and if its a modular or mobile home.
I do not think it is a fan relay, when a fan relay goes out it usually either wont work or wont stop. Comming on and off sounds like its an older furnace with a hellical spring fan switch. Ive see this more than once.
Did you have to replace anything on the fuirnace lately? Have you lived in this home more than 1 year?
In older non electronic board models of furnaces the indoor blower was turned on when the heat exchange allowed the heat chamber to collect heat and then at a temperature between 90 and 150 the blower came on. It went off when the temperature in the heating chamber went below the on temperature usually 20′ cooler.
I found some of those furnaces would activate the blower in the spring from just the heat from the sun being conductged down through the flue pipe and into the heat chamber, if the setting was too low on the heat chamber sensor. Some of these fan switches had rectangular case/box sometimes with a cover sometimes without a cover and a power wire and fan wire always went to them, and it has a round dial with 2 or 3 small pointers around the dial. the first (LOWEST) SETTING WAS THE OFF for the Fan the next setting was the on for the fan and the 3rd setting (some did not have this) was the high limit that stopped everything if an over heat condition started (like if the indoor motor did not run). The problem if you have this type switch is the on and off settings for the motor are too close together. Just move them apart and see if this corrects your problem.
Please let me know if this helps..
Check the relay inside the furnace- it should be up above, where the blower assembly is. It’s probably stuck. If you’re luckym the installer left the wiring diagram and model # paperwork attached to the air handler, if not, you’ll have to get the make and model # and google it to find a replacement relay. They’re really easy to replace, just follow the big clumps of wires to what will probably be a small metal box, which will have a panel you can unscrew to expose the relay.
Do yourself a big favor, and label each wire with which connector it goes to on the relay before disconnecting anything. And another favor- turn off the breaker first!
If it’s a Trane, a relay may cost slightly more because they throw a proprietary circuit board on it, but I replaced my Trane (Honeywell Relay) for $23.