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Bad switch I have a beatup high temp limit switch and want to replace it but there are no numbers on it. my furnace is a intertherm mgha-066abfc-01 the switch is right next to the blower on the heat exchanger.

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  • 571 Answers

Get a magnifying glass & look @ the side of the should have an L number ie. L235 (limit 235 degrees) Any thermal disc the same size in diameter & rating will work.

Posted on Dec 20, 2013


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Posted on Jan 02, 2017

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SOURCE: Furnace Blower cycles on & off

check out the fan switch on the unit and make sure that its the correct one. it should cycloe on @ 120 degrees and cycle off around 100 degrees. Someone may have put in a different one and that is not the approve one.

Posted on Dec 23, 2008

  • 587 Answers

SOURCE: Intertherm MGHA-075BFC-01 gas fired furnace - air

Probably the limit switch is open.

Posted on Oct 16, 2009

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SOURCE: Intertherm furnace pilot won't light

There should be a reset button in the upper chamer next to the fan motor. In the middle ,push in on the center red button to reset it, this tripps because it says I,m not gettig enough air flow due to a plugged or dirty fliter located on the front cover or door.

Posted on Dec 18, 2009

  • 2382 Answers

SOURCE: Intertherm M2RL-080 : Furnace LIGHTS and burn,

Hi, you first of all replace the thermostat which can sometimes be the cause of the clicking noise. Since you have changed the limit switch and the blower motor, consider changing the thermostat to see what happens and if the clicking continues, you have no choice than to change the circuit board..

Posted on Oct 22, 2010

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SOURCE: i have a intertherm gas furnace mgha-056abfc-01 the pilot light will not stay light.

Hello, have you checked the orifice or gas tube for any blockages? Sometimes dust and spider webs can block the flow of gas.

Posted on Oct 25, 2012

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Intertherm wiring diagram for model number MGHA-056ABFC-05

you have a 24 volt shorts check your thermostat wires to see if they are frayed or if they are touching anything. Check your outside wires also go to the thermostat.

Jul 12, 2014 | Intertherm Heating & Cooling

1 Answer

Where is the flame sensor on Intertherm MGHA-070abfc-01?

There is no flame sensor per se, unless it has an ignition type pilot. Only temperature activated switches employed.

The limit switch to the left of fan switch is "Nordyne" part #626259. This switch is rated at140 degrees. When the temperature inside firebox exceeds 140 degrees, switch "opens" removing power from the secondary of 24vac xfmr.

The fan switch to the right of the limit switch is "Nordyne" part #626337. This switch closes when firebox temp reaches 115 degrees. Opens at 70 degrees.

At the top to the left of fan is a smaller limit switch, which is a secondary safety switch. The increased temperature within the heat exchanger box activates this switch. It is wired in series with the thermostat wiring.

Hope this info helps.

Feb 05, 2013 | Intertherm Heating & Cooling

2 Answers

I have a intertherm gas furnace mgha-056abfc-01 the pilot light will not stay light.

If it's not the limit switch, perhaps the thermocouple or gas valve is defective.
Was there a gas outage?

Oct 24, 2012 | Heating & Cooling

3 Answers

I have a Intertherm gas furnace mod# MGHA 070ABFC 05. It comes on for 30 seconds then off for 30 then on and continues this.


check how far away the thermocouple is from the pilot flame, the end of the thermocouple probe should be in the flame, adjust it over. if its in the flame then it might need a thermocouple element it unbolts from the manifold. or the pilot flame may not be big enough to hold the valve open, have to research or use a wire the circumfrence of a bread tie to clean out the pilot orifice. always have a fire extinguisher in your rv..


Jul 04, 2017 | Heating & Cooling

1 Answer

I have a intertherm furnace modelm1mb o7oabw, the diagnostic light flashes once for limit switch open,but i've replaced the limit switches,any ideas?

Hello, a limit switch will open for the following reasons, dirty plugged filter, blower motor not operating on correct speed or weak, too high gas pressure to burners. If you have a thermometer you can check the temp rise of the furnace by measuring the return air temp and the supply air temp and then the differance between the two numbers will give you your temp rise, compare it to the temp rise that is stated on the furncae data plate. if you are not in the range of what the data plate states then start with the filter and check the blower motor to make sure it is operating correctly.

Feb 08, 2011 | Intertherm Heating & Cooling

2 Answers

Intertherm furnace pilot won't light

if there are two wires to gas valve check voltage between these two wires while the furnace is going through a start up if you never get a call or voltage to valve your control board is bad, if you are getting voltage ,your valve is bad

Sep 29, 2009 | Intertherm P3RA-048K Air Conditioner

2 Answers

Intertherm Furnace Will not stay on

possible dirty air filter low air flow causing high temp in fire box to trip limit switch or fan motor is bad hope this help let me know if you if this solved problem I may need more info

Jan 04, 2009 | Intertherm P3RA-048K Air Conditioner

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