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My mom's oil furnace runs for about 1-3 minutes and shuts off

She has to shake the stack control box, on her oil furnace, then it will run for a few mintes and shut off. I think its the stack control (it has a red push button)

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  • kenii Jan 31, 2009

    It doesn't make any noise when I press and hold the reset button. I tried taking out the sensor that inserts into mounting phlange and cleaning it off with soapy water. That did'nt help. With the cover off I can manually press down on the switch that turns the furnace on, but it doesn't stay on long or it stays on too long. After that it takes almost an hour before it can be swithed on again. Do you think I need to replace the control. Your mention of the relays and the rest gave me confidence that I am talking about the right part.



    Thanks for your help,

    Kenii

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Loose wire

Posted on Jan 31, 2009

  • coss985 Jan 31, 2009

    sorry about that last post it was meant for a different problem. Is it a Ra117 honeywell (I think thats the old number)? From what i remember there are a few relays inside and more than likely the contacts are bad. If you push the reset and stay there what kind of noises does it make?

  • coss985 Jan 31, 2009

    Although it is a expensive control I think you have isolated the problem to that stack switch. I do not believe they still make a direct replacement but i am relativly certain that a heating parts supplier can get you a rebuilt control for 2/3 the price or less. I don't know the rules here so I hesitate to give out names but you should not have to much trouble locating one.

    Good luck and let me know

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The fan normally runs for a few minutes or so after the gas shuts off.

This removes the heat from the furnace and transfers it into the living space instead of just letting it possibly cause overheating of the furnace until it dissipates. If it is a fan that blows outside, that fan also needs to run for a few minutes to clear exhaust gasses from the furnace - to keep them from dissipating into your home.

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My furnace fires up run for about five minutes then fire box shuts off and the fan runs until my furnace runs through its cycles but the fan runs almost continually runs it only shuts done for a few...


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My furnace is an older type furnace and it was working fine yesterday but the blower won't shut off after it runs for a while it run continueally I was wondering what I could do to fix this pr


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If it continues to run, squeeze the sides of the 'lid' of the box and remove the cover. Inside you'll see a round moveable dial with three pointers, marked 'fan off, fan on, and limit'. The 'limit' should remain at or near the 200 degree setting, the 'fan on' can be anywhere around 140 and the 'fan off' can be anywhere near 100 degrees. It is the 'fan off' position thats giving you the grief.

Turn the thermostat up again and sit there and watch the dial do its thing and yo'll understand better how this control works. Watch it rotate past the 'fan on' setting and observe the fan turn on. Turn the thermostat below room temperature and watch the gas shut off and the dial rotate back towards the 'fan off' setting. If it hangs up again before twisting past the setpoint, you can slightly increase the setting to compensate for the weakening bi-metal element. But just a tiny bit, not a great amount or you will have the fan shutting off with a lot of residual heat still in the heat exchanger. The idea of the delay in shutting off the fan is to remove all that residual heat and transfer it to the house.

There are other brands that utilized 'timed on' fan controls, and there are a few other variances of controllers but what's described above should cover the vast majority of older furnaces.

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A certain sequence of events has to occur to start normal operation. My furnace would start the stack blower which would then run forever without the furnace starting up. The service tech replaced the stack blower controller and the ignitor to get things running right again. Remember that some stages of startup are temperature dependent. For example, the burner has to heat the bonnet enough to close a thermal switch and turn on the main.blower.

Oct 26, 2013 | Heating & Cooling

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I have an oil fired aga the oil will not come throw to the burner


see the following steps:
f the burner doesn't run, set the thermostat a few degrees higher than normal to see if it comes on. If it still doesn't come on, check switches, and breakers and fuses (see the Electrical Service Panel Fix-It Guide). If the unit has a reset button, press it. Also oil the motor at any oil ports (see below). If the unit doesn't want to start and run, first check the c to make sure that the ignition is getting power. If there is power, check the built-in safety controls (see below) that may turn the system off if they perceive problems.
If the burner cycles too often, replace the filter (see below). Also, oil and adjust the blower (see the Forced-Air Distribution Fix-It Guide).
If the burner runs but won't fire, make sure the oil valves are open and that there's oil in the tank. Check the tank level with a clean stick.
If the burner smokes or squeals, shut off the unit, let it cool, and fill the oil cups. Recheck them after the motor has run for an hour.
If the chimney smokes even after the flue has warmed up, the unit is wasting fuel; call for professional repair.
Safety Controls
Oil furnaces and other heat systems include safety devices that monitor operation and turn off the unit if something goes wrong. In some cases, the safety device can be the problem.
If you encounter an operating problem with an oil furnace, first reset the safety and try again.
If the burner kicks off again, shut off all power at the electrical service panel ; the burner motor and ignition may be protected by separate fuses or breakers.
If the sensor has a photocell, wipe it with a clean rag or tissue and see if the furnace starts.
If the safety is a stack switch mounted on the flue, remove the screw holding the unit to the stack, slide it out, and wipe off the sensor.
If the furnace won't start after three tries, seek professional assistance. Unburned oil can accumulate in the combustion chamber and "flash back."


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Jul 31, 2012 | Heating & Cooling

1 Answer

Our furnace seems to run on idle constantly . we are using more oil but not electric if i tap on the box it stops but starts again a few minutes later??


We need to get a few details cleared up:

Is it the Furnace (Oil burner) that is running, (on idle you called it..)
or is it the FAN that is running?
What are you tapping, that shuts off what?
Is the fan that blows the air around the home shutting off, or the burner?
(When the burner is running, there is a loud roar!-- the fan should be much quieter..)

If it is the fan that is running,-- I might ask, is the air coming from the registers too cold?-- for with the fan running, you are getting all the heat from the oil that was burned. But naturally, you don't want it to be uncomfortable.. So-- you can open the cover on that Fan control switch, and raise the temperature at which the fan turns ON and OFF..

Let us know what you find.

Mack B

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1 Answer

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Nov 01, 2009 | Heating & Cooling

1 Answer

Furnace runs OK, but blower runs again a few seconds later


Could be a defective thermostat in the plenum.
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Intermittent operation is a defective thermostat or relay.

Mar 11, 2009 | Carrier Heating & Cooling

1 Answer

Fan shuts off too soon after oil burner stops


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.

Jan 04, 2009 | Honeywell Power Humidifier: Furnace...

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