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My light on circuit board flashes four times

Chert sayshigh aux or spill limit switch

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  • Dayton Master
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Jump out limit switch and see if it works and stops flashing .

Posted on Jan 01, 2013

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Posted on Jan 02, 2017

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You need the model number of the furnace to determine what the flashing light is telling you. Many times the part that looks to be at fault is not the true fault in the furnace. A slow running blower could cause the limit switch to trip. The circuit board tells you that the limit tripped, but the real cause is the motor or clogged filter.

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Probably a bad circuit board. I have the same problem once the water gets above about 82 deg. I tried cleaning the filter and strainer, cleaning out the heat exchanger, replacing the temperature limit switches, bypassing the pressure switch, and cleaning the ashes off the burner, and none of these worked.

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York "high Aux or spill limit switch open"


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Furnace main fan comes on but the furnace doesn't come on. The indicator red light blinks four times. What does this signify?


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I have a GPG13 unit that is locking out on the aux limit switch. Can I increase the post timer for the bnlower. The blower compartment stays too hot after shut down and causes the aux limit to shut off.


You should be able to adjust the Blower off time by way of Dip switches on the circuit board...these are typically and band of tiny switches on a red block . Is the furnace new??? You may also increase the speed of the blower by using "High" speed which is the same as the AC speed...heat typically uses Medium...also make sure your filter is Clean and yoiur retun air vents are open and not obstructed

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1 Answer

Circuit board blinks four times


check your filter if thats clogged that will send a four flash limit open or your blower motor might be bad these units are known to have popped rings and cracks on thier heat exchangers if there isnt enough airflow if your filter is clogged or motor is shot i would call someone monday and get your heat exchanger inspected

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