Question about Heating & Cooling

1 Answer

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?

Posted by on

  • mpage Nov 05, 2007

    as it turns out the fan blade was jambed from moving the heater several times in storage. I unjambed it and it now works great. thanks for the help!



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Master
  • 1,420 Answers

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


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

What is kicking off to make my furnace go through its cycle and then blow cold air and wont shut on my Ruud gas furnace

it could be flame sensor or high limit switch how long do burners run does the fan stay on while this occurs

Dec 15, 2016 | Ruud Heating & Cooling

1 Answer

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 | Heating & Cooling

2 Answers

1999 Goodman down draft natural gas furnace. It starts as normal, the burners fire and it warms up, but the blower doesn't start, after a couple minutes the burners shut down and the blower immediently...


Feb 03, 2015 | Heating & Cooling

1 Answer


The fan speed might be set to fast cooling the fan limit control prematurely. Or the fan limit switch is not calibrated correctly. Or the fan limit switch is bad.

Dec 21, 2013 | Intertherm 56000 Btu Gas Furnace

1 Answer

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 Heating & Cooling

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

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

Not finding what you are looking for?
Heating & Cooling Logo

Related Topics:

90 people viewed this question

Ask a Question

Usually answered in minutes!

Top Heating & Cooling Experts

Paul Carew

Level 3 Expert

3178 Answers

Dan Webster
Dan Webster

Level 3 Expert

8220 Answers

Tim Whalen

Level 3 Expert

3074 Answers

Are you a Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides