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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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Posted on Jan 02, 2017

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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

1 Answer

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

1 Answer

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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Thank you.

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.

Dec 04, 2010 | Goodman GDS80904BNA Open Flame Heater

1 Answer

Chamberlin garage door opens to top limit bounces back to return down about 6 inches and then returns to open limit. What adjustments are neccessary?


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.

Sep 11, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Moonroof wont close all the way


Do you know how to test automotive electrical circuit's with a DVOM - digital volt ohm meter ? When adjusting the moon roof did you see any switches ? sunroof limit switch
Measure the reference voltage of the sunroof limit switch soft stop signal circuit at the sunroof control harness connector to a good ground.
Does the reference voltage measure near the specified value?
4.5-5.5 V
Notice: Do not open the sunroof glass past the full open soft stop position. Doing so may damage the sunroof assembly and or the roof top.
Connect a jumper wire to the sunroof limit switch soft stop signal circuit at the sunroof control module harness to a good ground.
Turn ON the ignition, with the engine OFF.
Using the sunroof switch, operate the sunroof system, not to exceed the full open soft stop position.
Does the system operate as requested?

Do you know what a wiring diagram is ? Free one's here
http://www.bbbind.com/free_tsb.html Enter vehicle info. year ,make ,model an engine size . Under system click body & accessories ,then under subsystem click on sun roof . Click the search button then the blue link . See the control module , motor an the two switches ? One is probably miss adjusted . or bad !

Power Sunroof System Components
The power sunroof system consists of the following components:
• Sunroof control module
• Sunroof motor with the limit switches
• Sunroof switch
• Sunroof glass-spoiler type, with glass sliding above roof
• Sunshade
• Rail and track assembly upon which the sunroof glass rides
• Power sunroof system circuit breaker: PWR WDO 25 A
• Ground: G204

Sunroof Limit Switches
The sunroof limit switches track the position of the sunroof glass through two limit switches:
• Soft Stop limit switch through the sunroof limit switch soft stop signal circuit
• Vent Stop limit switch through the sunroof limit switch range signal circuit
The sunroof control module monitors the limit switches and based on the input combinations, determines the position of the sunroof glass. As a sunroof limit switch closes, the 5 volt reference will be shorted to the sunroof limit switch low reference circuit, pulling the 5 volt reference to 0 volts.
The sunroof control module monitors both sunroof switch input requests and based on the sunroof limit switch input combinations, will control an output to the sunroof motor, to drive the sunroof glass to the requested position.

Sunroof Motor
The sunroof has a bi-directional motor. When the motor is not operating both circuits are grounded. When the motor drives the sunroof glass in the direction from the closed to vent or vent to open position, the following occurs:
• Voltage is supplied to the sunroof motor open circuit.
• Ground is maintained to the sunroof motor close circuit.
When the motor drives the sunroof in the direction from the open to vent or vent to closed position, the following occurs:
• Voltage is supplied to the sunroof motor close circuit.
• Ground is maintained to the sunroof motor open circuit.
The sunroof control module is equipped with a timer circuit which stops the operation of the sunroof motor after 8 seconds.

Dec 23, 2017 | 2003 Pontiac Sunfire

1 Answer

Limit switch open furnace wont heat


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

Apr 06, 2010 | Ruud UAMB Air Conditioner

1 Answer

York "high Aux or spill limit switch open"


how can I fix the spill limit switch, also how do I found it

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1 Answer

Craftsman opener, limit switch not stopping motor.


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

Sep 30, 2009 | Electrical Supplies

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