Question about Coleman Propane Forced Air Heater w/Electronic Ignition (50,000-80,000 BTU)

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Limit switches how to check a limit switch

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Take Ohem meter and check

Posted on Dec 19, 2008

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Limit switch code flashes no inducer motor or ignition starting


usually the main blower runs non stop when limit circuit opens. Shut off the power and check each limit with the wires removed. Use your meter, check the same way as you would check a fuse. Sometimes you can tap on the main limit to reset it. Some secondary limits have a small plastic reset button in between the wires. Check this also.

Nov 27, 2011 | Goodman Heaters

1 Answer

Gas furnace with Honeywell smart valve code error 6:2, replaced the following: pressure switch, smart valve, ignitor flame sensor and control board. Cleaned out the condensate line. Still getting 6:2 flash...


Hello, it sounds like your Furnace might be shutting off due to your high limit switch.A limit switch will open when the furnace overheats due to low airflow, . check air filter, clean blower wheel, and check to make sure the blower wheel is running at proper speed and not dragging sometimes cause by a weak capacitor. Anything that restricts airflow will cause a limit switch to open.

Mar 08, 2011 | Honeywell Heaters

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Goodman dependable 92,7years old. Furnace works sometimes. Checked out by qualified technican. no problem found. Constant checks shows troubleshooting light blinks three (3) times. Help please. 3...


This indicates a open limit switch on the furnace, the heat exchanger is getting to hot therefore the limit switch is opening and not allowing the furnace to work properly. Did the techinician check the limit switch on the unit?

Dec 30, 2010 | Goodman GMS90703BXA Heater

1 Answer

PSE+G stated the problem was diagnosed as a pressure swith on my Goodman heater....any suggestions to fix? Is this an expensive job?


How do you test a pressure switch and other limit controls? This is for people who are experienced with electrical equipment and the use of a Volt Ohm meter. *Please never by pass a pressure switch or limit control. The pressure switch and limit switches are there for your safety. If you have an open limit control either the furnace has over heated or the limit has gone bad. Problems that would make a limit open up would be dirty filters, dirty evaporator coil causing a restriction in the air flow or a slow blower motor (check the capacitor on the blower motor to make sure it is good). A weak blower motor capacitor will cause the blower to run slow and eventually fail. Pressure switches, and limit switches can be tested with a meter in the same manner. With the furnace calling for heat you can test each of the terminals on the pressure switch to ground to make sure the pressure switch is closed. You should be getting between 24 to 28 volts from each terminal to ground if the pressure switch is closed. If the pressure switch is open you either have a stopped up vent, drain line (if you have a condensing furnace) or bad pressure switch. Please keep in mind there are many different types. The front terminal is burnt and discolored. This is a clue that this pressure switch has a problem.

Dec 22, 2010 | Goodman GMS90703BXA Heater

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

I have a goodman and the light had blinked 4 times on the code it say open limit switch but now its not getting any power I check the board to look at the fuse and its good I just don't know why it...


Not sure if this will help, but when you take off the blower door there is an interlock switch...could this be the reason you lost power?

If you have an open limit, the easiest way to find it is to go to each of the limits, disconnect the wires (spade terminals) and see if you have an OL reading on any. Reconnect the wires after checking the switches to avoid mis-wiring. If it is your high limit that was open, chances are it has cooled down and will fire up now, but at the same time if it went off on high limit you may have a blower/air flow problem.

Remember that safety devices are there for a reason, so if a limit opened, check for the problem before just assuming a bad switch.

Hope this helps

Nov 16, 2010 | Goodman GMS90703BXA Heater

1 Answer

I have a dyno glo rmc-fa100dlx forced air heater. It will light and work for a few minutes, up to about 5, then it will stop heating and the fan will keep blowing. any ideas? thanks!


If the unit comes on and runs but then shuts down, that sounds like an indication of a high limit trip.

Most, if not all, furnaces have high limit switches that keep a constant check on the temp inside the furnace or air handler. On most systems, once this high limit switch has been made (got to hot), the limit switch breaks control voltage to the heating device (strips, gas, fuel, etc.etc..). The blower motor continues to run until the high limit has dropped in temp and reset itself.

On some models, the high limit is a manual reset, meaning you need to reset the switch yourself or shut the unit off and then back on to reset it.


Check all filters and replace as necessary. Check the coils and fan blades for dirt build-up and cleanliness. Check motor belt (if applicable). If all these fail to solve the problem, then your issue either lies within the blower motor itself not moving enough air for proper heat transfer. Or the high limit switch itself is failing.

Jan 09, 2010 | Heaters

1 Answer

Limit Switch


It is rare that a limit switch goes bad. It is a safety control. If it is shutting off your furnace there is a problem that it is protecting you from.
If the limit switch is shutting the unit down your furnace is overheating. Check the filters. Check for any obstruction in the blower assembly. Check to see if you can raise the blower speed. Make sure all registers are open in the house. Your evaporator coil could be obstructed if you do not take good care of your filters.

Feb 28, 2009 | Goodman GMS90703BXA Heater

1 Answer

Furnace problems


On - OK
1 Blink - Ignition failure. Check Gas flow, gas pressure, gas valve, flame sensor.
2 Blinks - Closed pressure switch. Check pressure switch (stuck in closed position).
3 Blinks - Pressure switch - failre to close. Check venter, pressure switch, vent blockage.
4 Blinks - Open limit switch. Main limit or aux limit are open. (My comment - Means overheating in chamber. Often result of blocked intake air. Bad filter. In my case, plastic wrap had been sucked into the intake. )
6 Blinks - False flame sensed. Check sticking gas valve.
Rapid continuous blinking - Incorrect twinning, incorrect primary polarity. Reverse transformer secondary leads, reverse primary wires.

Closed pressure switch can be from dirty combustion vents, bad chamber pressure - like missing screws, maladjusted gas pressure, failing pressure switch, loose hoses, moisture in the hoses or fan blades The switch need to be closed to ge the unit to work

Jan 23, 2008 | Goodman GMS90703BXA Heater

3 Answers

Heater won't come on when temp drops...must reset limit switch every time.


The limit switch is shutting off and you are having to press the re-set button, right? The limit switch, if I am understanding you correctly, is the thermal disc type, may be ok, but what is causing it to shut off? I would first, not put total faith in the serviceman (PG&E maybe) and replace the limit switch. Its only a few bucks,and easy to do. Then if its still the same problem, look into the venting pipe. As it may not be adequate for the heater. Espically if its new. These new wall furnaces are kind of touchy. It may be larger, BTU wise, and the vent pipe may need to be enlarged. If this is a big job, and a bit too impractical, check the vent pipe, make sure its in good conditon, no leaks ect. install a cO2 detector and by-pass the limit switch.

Jan 07, 2008 | Cozy (W352E) Heater

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