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Gmp100-5 open limit switch - Heating & Cooling

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Limit switch will open due to a dirty air filter, dirty blower wheel, weak blower motor....anything that restricts airflow will cause the limit switch to open.

Posted on Jan 05, 2013

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1 Answer

Blower motor wont come on


Which limit switch is open and how did you troubleshooting that it was a limit switch?

Aug 15, 2016 | Heating & Cooling

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Furnace blinks 4 times indicating limit switch


Hello, a limit switch can open for several reasons, this could be due to dirty air filter, dirty blower wheel, blower motor not running at proper speed. Anything that cuts down on the airflow and causes tne heat exchanger to get way to hot will cause the limit switch to open.

Apr 16, 2011 | Heating & Cooling

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Last week my furnace went out. My landlord called a furnace technican and he said that the limit switch was fried. So he replaced the limit switch and did a tune up of the furnace. It took 2 days for the...


Hello, a limit switch will open when the furnace overheats due to restricted airflow, check the blower wheel make sure it is clean and also make sure the blower motor is running at good speed and not dragging. Sometimes a weak capacitor can slow down a blower motor to the point that the limit switch will open. Not sure what kinda tune up the tech did but you dont replace a limit switch untill the cause of the limit switch opening is found.

Mar 01, 2011 | Heating & Cooling

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Blower motor runs but furnace won't light indicator light says limit switch open. where is this switch. Tappan furnace


There may be two or three limit switches. The main limit switch is found over the burner about 2 " above. It will look like two wires connecting to a small rectangle plate. The limit is actually inside the heat exchanger and often opens if the air filter has not been changed or cleaned. Also on the burner assembly, there may be one or two small round disc shaped switches about the diameter od a quarter. They will also have two wires connected to them and they probably are connected to all the limit switches if you follow the wires. Look closely at these switches for a small tab located between the wires connected to them. This tab is a reset. Push in on the tab to reset. You may actually feel or hear the switch resetting if it opened. Make sure all registers are open and good air flow through the furnace.

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Jan 25, 2011 | Heating & Cooling

1 Answer

My Goodman GMP 125-4 furnace has 4 blinking lights and we currently are unable to get it to come on. What might be wrong?


if this is an error code and you mean that the light blinks 4 times then it is the limit circuit. This could mean either the high limit or a roll out switch is open. the limit switch is right in the center of the furnace above the burner and roll out switches are probably somewhere around the opening of the burner. Follow the wires from the limit to find a roll out switch cause they are in line with each other and the rool out switch could have a button to reset it. However if the roll out is not tripped then you could need to change the limit. Only way to know is to check for continuity.

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The limit switch of both the sides are not reached. The drive must be realigned to work till the door closes fully so as to touch the limit swittch to switch off.
Similarily the open door must go to the extreme point to cut off with the activation of the limit switch.

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If the limit switch is open try to jump the wires out... this should turn the heat back on. and if it does replace limit... if it dont let me know and we'll try again

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try adjusting limit switch wheel to shut off just a little earlier by spinning wheel closer to limit if this doesnt help im afraid sometimes even new parts can be faulty you might try another replacement

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