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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.

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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.

Posted on Sep 15, 2010

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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

I install 2 new honeywell non programmable thermostats. The temp never reaches the setting temp. Always 5 to 8 degrees off. I can not get the furnace to heat the home over 70 degrees. Even set at 80. Any...


If the furnace is cycling on and off and not reaching temp there is a problem in the control circuit. If the thermostat is not satisfied the furnace should be running without shutting off in which case the capacity of the furnace is inadequate because of size or problems reducing the capacity. This could be caused by an increase in home size, poor air flow (dirty filter, loose fan belts, fan running slow, obstructions in the duct), dirty heat exchanger or burner, reduced gas flow, over temperature switch bad causing the burner to shut off early, or a few more technical reasons. You may do well to call a technician to troubleshoot this problem.

Feb 09, 2015 | Heating & Cooling

2 Answers

Is it normal for my furnace to have burner cycle once or twice


That sounds normal. When the bonnet reaches a preset temperature the burner turns off then when it cools down a bit the burner turns back on. Clean filters etc will help to keep the burner on longer in a cycle.

Aug 24, 2014 | Heating & Cooling

2 Answers

My goodman furnacs says my limit switch is bad blower works but does not ignite .....? its modle gmt070-3 and where is it located


There are several limit switches in the unit there in various places in burner compartment. One on blower housing . One thing that I would try is replaceing your filter and turn the power off to the furnace and try starting the system after power is D/C for 5 minutes.

May 02, 2011 | Goodman GMS90703BXA Heater

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

We have a tempstar down draft furnace. 2 years ago the heat exchangers where replace because we were told they were cracked. This year the downdraft motor was makikg a lot of noise & we were told the...


Sounds like the low limit or high limit is out these control the fan motor.They are usually set to kick on around 150 degrees and set to go off around 95 to 100 degrees. Over heating does happen with cracked heat exchangers and it can possibly take these two items out. Normally your furnace should run approximately five minutes or a little less then your fan motor comes on and then for cooling down burners should drop and the fan motor should run again roughly five minutes or so then shut down. Times may vary as to your settings.

Dec 20, 2010 | Heating & Cooling

1 Answer

I have an early 80's mobile home with an "intertherm gas atmospheric furnace" pilot light is lit but can't get the furnace to "fire". Seems as though the limit control is stuck open. ...


If your pilot light is lit then I would first check your thermostat. Make sure it is on heat setting and fan is on auto, turn stat up to where it should be calling for heat. If you don't get burner to light remove front cover from thermostat and see if it has a mercury switch, if it does move temperature selector up and down and see if you can see a spark in mercury switch vial. If y ou cannot see a spark remove screws that attach t-stat to base.Remove carefully and disconnect wires that go to r and w terminals on stat base. Temporarily connect these two wires together. This should make burner light if you have power to thermostat. If burner does light disconnect wires and replace thermostat. Also if you have a volt meter check across these two wires and see if you have power there. Should be around 24 volts a.c. If your thermostat has a fan on setting try that. If fan runs you know you have power to furnace The gas valve needs 24 volts to operate and inside the electric control box in furnace there is a transformer to step down 110-120 supply voltage to 24 volts. If transformer is working you should be able to hear a low buzz or humming sound. You can also check across gas valve terminals when t-stat is set for heat, you should read about 24 volts. If you have 24 volts to gas valve and it is not opening then you need to replace gas valve. The main purpose of the limit switches is to turn blower on when temperature in heat exchanger reaches fan on temp,shut off blower after burner shuts off and heat in heat exchanger reaches fan off temperature, and limit if temperature exceedes set point without blower coming on. I hope this helps you. Thanks

Nov 25, 2010 | Heating & Cooling

1 Answer

I have a builder installed Goodman GDS80904BHA that is approximately 5 years old. Recently, when the furnace completes a heat cycle, approximately 1-2 minutes after the cycle has completed and after the...


I would guess that the fan off setting on your limit is set a little to high. If you have the manual you can see what it says about changing the running time for the fan after the burner has shut off look on the control board and you should see two switches,one to set the time for burners to fire before main blower starts and one to set time for fan to run after burners shut off. To help with the problem you are describing set fan run time up so fan wii run longer. Hope this helps. Thaks.

Nov 22, 2010 | Goodman GDS80904BNA Open Flame Heater

2 Answers

I have a GMP100 furnace and I replaced the control board because the blower fan wouldn't kick off now and then. It all works great but the main blower only stays on about 45 seconds after the burner turns...


Check the board for a set of dip switches. Check against the old board for switch positioning. These control fan on/off times. Ensure you turn power off before changing switch positions. If no dip switches,??

Dec 04, 2009 | Refrigerators

2 Answers

My heater will kick on right away but after 3-5mins it stops producing heat then a few mins later it will start heating again. Why?


The furnace could be shutting off on High Limit ...means your furnace is running too hot...check your filter and make sure return air vents are clean and clear....also it can be the Heat anticipator in your thermostat...which controls how many times your furnace cycles...basically your furnace should come on and off 5-6 times/hr ....need more info on your type of furnace and type of thermostat

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