My coleman oil furnace blower keeps coming on for 3 or 4 times after a heating cycle. Not knowing which limit switch to replace I replaced all of them and it still does the same thing. I have no schematic, the model number is 4084-756 Evcon
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Wow, that is a sorry tale. You need a new boiler or you need someone from the Coleman factory to sort that mess out. When people start making modifications to OEM Systems, you are in real trouble, especially when you get a new technician. Who knows what damage has been done to the electronics.
Have to know the model and serial of the furnace.
locate code list usually inside or on the back of a door.
Operation sequence= call for heat--inducer blower motor--makes pressure switch--signals board to bring on hsi--after a set time gas valve opens and you have ignition--main blower motor comes on after a set time
try looking at the afc the fan control might need cleaning at the back of it could be filled with dust, or blocked air filter afc works on temp rise to start fan running and temp fall to stop running check settings on the afc thhey should be in your manual or afc might need changing
If the unit fires but the main blower fan doesn't come on the the unit is shutting off on a temp high limit switch and it sounds like the problem is the main blower fan motor or control
you have multiple stages of heating and not all of the stages are operating. it could be a limit switch, that would be a very good place to start.(stages or zones)
If the fan takes too long to come on, the high temp limit may be opening. Could be a defective limit, hard to say without more info. Another possibility is a mis-adjusted heat anticipator. A normal setting would be around .45 amp. The heat anticipator is inside the cover of the thermostat (older, analog style). Good luck.
have you changed t-stat? if so you need to increase the heat anticipator. if you have a fan limit switch, the setting may need adjusting. Thay will change with age
The fan limiting switch is acting up. It should stay running until lower temp is reached. It will cycle until the temp stays below or at the low setting. Limit switches are adjustable.
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