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Oil burner loses power before gets up to temp but fan stays on

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Might be a bad flame sensor or fan/limit switch. Need more info.
Plugged fuel filter might be starving the pump inlet. don-ohio (:^)

Posted on Dec 24, 2016

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Posted on Jan 02, 2017

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My good man furnace model gmh80903bnca will not get to temp fan shuts off and burners keep burning then kicks off on high limit then starts process over but never gets to temp set at 655


If you have a switch that can manually turn on the fan, try it to verify the fan works. This is what I think is happening. The normal operation should be thermostat calls for heat, inducer fan comes on, pressure switch closes, igniter glows, main burner ignites and then in 30 or so seconds the fan comes on and stays on until the thermostat is satisfied. Once the thermostat is satisfied the burner shuts off and the fan runs for approx 120 seconds then shuts off. I think the control board that automatically turns your fan on is faulty. On most modern furnaces if the auto fan control fails and the furnace gets to hot and limits, when the limit opens and shuts off the burner it also energizes the fan motor to cool the heat exchanger.

Jan 13, 2018 | Heating & Cooling

1 Answer

Furnace blower fan stays on


Gotta have some info..............is It a gas furnace?What brand?Model?
Fan switches do get stuck ON. Is it blowing ALL the time,cool air? don-ohio

Dec 30, 2016 | Heating & Cooling

1 Answer

Heater fan runs for a few min then shuts down


Check the afc Automatic fan control is shut off too soon .

Apr 29, 2017 | Vulcan Heating & Cooling

1 Answer

My Ruud furnace used to regulate 1 deg +\- the set temp. Now it regulates right at the set temp and the fan cuts off while the burner continues to fire for a minute or so then the fan kicks back on for...


Hi,
It appears to be the fan limiter switch. It comes on at a certain temp when heating up and shuts off on the high end of its setting. Once the burners are shut down, the fan continues for a few minutes to cool down the burners. The limiter switch is adjustable but it sounds to me to be defective and should be replaced. Good luck and stay warm, :-)

Mar 15, 2011 | Ruud Heating & Cooling

1 Answer

Our Monitor MPI 41 model heater won't stay on. It flashes 88:88 in the time/temp window and the Burner status flashes high. When we shut it off (power down) and power it back on it works until it reaches...


Mine is getting fuel, but it still clicks off like the original post stated, and its clean. The only other thing .. that water in the tubing. We get a TON of watered fuel here in Alaska! Damn oil venders.

Dec 31, 2010 | Heating & Cooling

1 Answer

Burners shut down at set temp but fan continues lowering temp


the reason he told you not to cycle the power is because some where there is a flashing light that he can decode and tell him where to start looking for the problem. Call him next it happens and don't touch the power or the stat until he gets to see the unit.

Aug 03, 2009 | Heating & Cooling

1 Answer

Fan cycles on and off to often the burner stays on and the fan cy


what is happening is that the heat exchanger has to get to a certain temperature before the fan comes on that way you have warm air blowing out of the grilles and when the heat excahnger gets cool it shuts off until it warms back up again.

Jan 15, 2009 | Honeywell L4064B2236 Fan/Limit Control...

3 Answers

Riello oil burner


i have a reillo oil burner that fires up from cold no problem reaches the set temp and cuts out, when it tries to kick back in it keeps clicking the lockout light is not coming on and the fan is still running any ideas?

Oct 08, 2008 | SySTOR Systems (400S52) Burner

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