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High limit I have a wall mtg gas furnace that will go off on high limit with out the fan kicking on. this is a used furnace that has been instorage for over a year. but was working perfectly prior to storage. I believe the fan motor is ok but I have not checked it yet to verify. what else should i look at?

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Re: high limit

There will also be some sort of surface mountad switch which activates the blower at a certain temp. With the unit unpluged and the heater off, take a meter and check for continuity thru the switch. there should not be any. Then start up the heater but keeping the blower unpluged, check again after a few minutes. This time your meter should show continuity.

Posted on Nov 02, 2007

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Gas furnace short cycles 2 minutes or less. Multiple troubleshoot steps and replaced components - no help. Any advice?

I did not see that your indoor fan motor started. Near your indoor fan motor there is a temperature switch that is called the fan delay relay. On a temperature rise the relay shuts a contact that turns on the indoor fan motor. If the contact does not close the high temperature limit will shut the gas controls off like your getting. A fan delay relay also allows the fan to run a minute or so to carry away the remaining heat in the furnace and help cool the furnace down. The fan delay relay is normally mounted in a recessed area in the fire wall of the furnace plate. I have also seen them on the top of the furnace heat exchanger. Anyway, the fan delay relay will probably not be available on a sunday, so temporarily until parts are available, try turning the thermostat fan from auto to on and try the furnace again. By turning on the fan to on the high temp limit will not shut you down again.

I have had high temp limit change there trip points, but you said you bypassed it and did the same thing.

Another cause could be using the wrong type of air filter. The new pleated filters sold block to much air flow. If air mass flow rate drops the difference in temperatur go up and when the difference in temperature go up, it gets nearer the high limit and causes it to trip. All pleated filters drop normal air flow through ducts by at least 35%. To make your air duct system work properly use the what is called throw away filters which cost about 1/3 the cost of the pleated filter. Remember to either clean or change the throw away filter monthly to reduce dirt being drawn into your duct system.
Hope this helps.

Feb 13, 2015 | Heaters

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Have a gmp125-4 furance blower runs all the time checked themostat wires error code 1 blink then 2 then 3 then 5 furance works if you turn power off turn back on when heat kickes off blower comes on gives...

Sounds like limit switch issue. Furnace heats up, high temp limit switch opens, fan will stay on. GMP model is older and do not have the codes.
May be over fired, have airflow problem, to cause the limit to open.
Next time before shutting off power, try to find the limit, it has two wires that connect to a 1.5 x 2 inch card mount to the furnace fire wall. tap on it and see if the blower stops. If so replace the limit.

Sep 06, 2011 | Goodman Heaters

1 Answer

Furnace will kick on, begin heat up, go to the point where the fan should start and the whole thing shut down. If I move the thermostat down below the temp it show, it will start again and do the same...


Sounds like the blower motor is bad and then the unit is kicking off on high limit....

Probably nothing you can do with out getting a new motor to replace the bad one...


Feb 02, 2011 | Dayton Gas Furnace Heater

1 Answer

My furnace blower kicks on and the flame lights for about 5 seconds then kicks off. I replaced the igniter recently. The service trouble light blinks continuously.

Your furnace may be kicking out on high limit. Its possible your circ. or blower fan needs to be cleaned. If you don't get enough air moving across you heat exchanger it will kick off on high limit.

Jan 14, 2011 | Goodman GMS90703BXA Heater

1 Answer

My furnace kicks on, runs a little while, kicks off, then kicks on again until desired temperature is reached

it could be the thermostat on the wall not working or the fan control is not working as it should also check to see if air filter is blocked

Oct 24, 2010 | Dayton Gas Furnace Heater

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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Dayton blower fan repeatedly kicks on and off

chech the air filter is clean and the fan limit switch look to change fan limit

Nov 01, 2008 | Dayton Gas Furnace Heater

1 Answer

Fan switch will not make (limit switch).

If the snap switch is not located close enough to the plenum, this can be problem. The other option would be to cover the switch area with a metal shield or liatherm paper (fire rtardant paper).

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