Question about Honeywell L4064B2236 Fan/Limit Control Heater

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Oil furnace fan on all the time

I have a carrier oil furnace with a honeywell st9103 control. The fan is on all the time and the burner will not fire

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Posted on Feb 06, 2009

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You need to check the wiring to the limits and safety devices with are in a number of locations, make sure all connections are tight.The most common cause for the blower to run is the high limit device which is the one mounted above the burners on the flat metal panel with two wires.

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On the oil pump there should be a bleed screw. Attach a tube to it and the other end to a can and 3/8" wrench, restart burner by depressing red button on Honeywell control and open up bleed screw. Oil will start flowing into can. When full stream of oil coming out of hose, tighten bleed screw. You have less than a minute to do this or the Honeywell control will shut off burner for a minute. It may take more than one try.

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1 Answer

I have an olsen oil furnace, the problem is the burner will shut down 5 or 6 times before it reaches the set temp, the fan limit control is set at 90 and 120, its a honeywell limit control.


Hello A couple of things.If burner is cycling on high limit ,it can be a air flow problem.Change the air filter.Check the blower wheel that is reasonbaly clear/clean.Also check the intake grille that it is not blocked and all the supply grilles are open.Also mabey the nozzle size can be steped down if the input is too high(a slightly smaller fire).If the blower fan on/off is the problem (as the burner is seperate) raise the 120*f pin to 130*f but hold the wheel disc steady during adjustment.Leave the 90*f at 90*f.

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Hi, You are right, fan is on a time delay in the heating cycle, and after burners fire that is when this delay comes into play. You have a preset factory temperature that determines the cycle on time for the fan, and the off time after the burners shut down also. This will not be in the thermostat, but in the fan/limit control the is mounted on the face of the furnace, with a probe inserted into the fire box.Depending on how old or new this unit is, will depend on the type control you have.It may be just a high limit switch, or the 1st I mentioned.If so, It rotates in the burner as the temperature rises, to turn the fan on and off.Disconnect power, remove cover, and 2 screws.Slowly remove the control and gently clean the probe. Turn the dial if this one has it and you will be able to hear it click. This click is contacts closing to start fan operation.Reinsert and try again. If problem continues, you will have to replace it.They do tend to stick closed/on, in the heat cycle from time to time and a cleaning sometimes will solve this problem. Not knowing how old this furnace is and type, make it difficult to give you a correct diagnosis, so check this fan control as I have explained, and if your system is of a different type, please let me no so I can correct this problem. Sincerely,
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