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Burner lights, fan wont come on, fan runs on manual setting, has new fan switch set at 110

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YOUR FAN ON SETTING IS THE SECOND SETTING ON THE SWITCH .THE LOWEST SETTING IS THE TEMP AT WHICH THE FAN CUTS OFF AT THE END OF A SUCCESSFUL HEAT CYCLE. THE THIRD SETTING IS THE TEMP AT WHICH THE FAN COMES ON MAYBE 140 ISH. THE THIRD SETTING IS THE TEMP AT WHICH THE BURNER IS SHUT DOWN IN AN OVER TEMP SITUATION SAY 200 . THEN CONSIDER THE FACT THE SETTINGS ON THE DIAL ARE VAGUE. ACTUAL TEMPS MAY BE 20 DEGREES DIFFERENT, AND PROPERLY SETTING IS USUALLLY DONE WITH AN ELECTRIC THERMOMETOR.

Posted on Oct 25, 2008

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Intertherm Furnace Model #mmhb070abhr06. Burner lights up but shuts down after about 10-30 seconds then recycles over & over again when fan is set to auto (because fan does not cycle on when set to...


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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.

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1 Answer

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Hi, Yes, you have the answer to you're problem. Now, I don't no if you have just a high limit, or a combination Limit control? I will go with the combination fan control as when they go bad, they stick in the closed position and they have normally open contacts. When the heat exchanger starts to heat on a call for heat, there is a dial on the fan control with temp. settings on it , and it will start to rotate as the heat gets higher. When it reaches its set fan on temp, it with start the fan.We no the fan works so the blower is good, so it shuts the burners down on you're high limit temp. which is factory set to about 250*F. When you turn The t-stat from auto to on in the fan side, that solves the problem temp, only. You will need to R & R the Fan control. If you need some direction on doing this please let me know and if it is a Honeywell auto/on type that is rectangular in looks, and if you remove the cover you will see the temp. dial with arrows on it. Thank you.
Best of Luck, and Sincerely,
Shastalaker7


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1 Answer

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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.

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1 Answer

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I am sorry to inform you but this is the 2nd unit you have in that outlet and are having problems, I think you only have 110 volts at the unit...1/2 of the voltage needed. On a 220 volt line there are 2 lines of 110 volts and they BOTH must be present for all the features to work. With only 110 volt, the lights might come on and that would also explain why, when you turn on a burner the clock flashes. You are completing a circuit. Check your home wiring and repair it. Your range will function properly once your resolve the problem with your home supply line to the range.

Good Luck, Eric

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1 Answer

Weatherking control board


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