Oil furnace fan on all the time

Cad Cell Relay Control Guide: heating system reset switch ...

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LOW VOLTAGE WIRING REPAIR UPGRADE ... LARGER VIEW of an oil burner Cad Cell Relay by Honeywell ... The gray box in the right in this illustration. ... motors including those operating air conditioning fans, heating system oil burners, ...

Oil furnace cad cell and relay - YouTube

? 11:31
https://www.youtube.com/watch?v=SHTwhOtvQWE
Mar 30, 2012 - Uploaded by grayfurnaceman
Explanation of the operation and troubleshoot of the cad cell relayand the cad cell used ... Yeah there's oil and I have tried but I'm not sure if I reset right .... i think it's supposed to be 160 on thelow limit 180 on the high limit....Missing: voltage ‎chatter

Dean,
What kind of primary control? Beckett?Honeywell? Carlin? Control model #?

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.

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.

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.

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,
Shastalaker7

That is an old style t-stat i would replace it with a more up to date model. Your problem may be in the limit switch. But yes to answer your question most fans can be adjusted just depends on if it has a manual limit that looks like a silver box on the interior of your furnace or if it has a mother board control system.

by restart button you mean reset i believe,its located on top of oil burner and says only push one time .if thats the button your pushing it is the reset button or retry for oil burner if you are pushing this there is a problem with burner

This sounds like an oil burner, which would mean your getting an oil biuld up in the fire chamber when the burner fires up. If it is a gas furnace you need to ajust the air flow.

my Beckett oil burner with a honeywell R7184P just did the same thing. Quit burning, blinks for half a second. The burner says press reset once, if it does not reset then call a local serviceman. It is cold here in Alaska, you betcha', and my oil must have jelled up. It happened once, but pressing reset solved my problem, two days later it stopped again. I applied heat (hair dryer) to my supply line, added an anti-jelling solution to my tank. Here is what I found.

"The Honeywell R7184P-1080 (interrupted control—transformer shuts down 10 seconds after flame is established) is now the standard control used on all Beckett oil burners along with the new “Cleancut” pump. The Honeywell control has both a 15 second pre-purge and a 15 second post purge feature, as well as internal self-checking of the control itself. The control has 15 second lockout timing plus a 10 second ignition carry over period. After 3 lockouts during the same call for heat, the control goes into restricted lockout., A restricted lockout condition may be reset by holding the reset button down for 30 seconds until the LED flashes twice. At any time the control is powered, the reset button may be held for 30 seconds to reset the lockout counter. There are several new “Service Features” with the R7184P control that make for easier servicing."

You have to press the reset button for thirty seconds. I don't know how cold it it there, or what number oil you guys are burning, but what I do know is that you guys have been pressing your reset button more than once.

This worked for me. Good luck.