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Where is the limit switch on an Intertherm M1MB070ABW furnace?

I am getting a flash code 1 that the limit switch is open but I don't know where the limit switch is or how to troubleshoot/replace it.

Posted by Anonymous on

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  • Intertherm Master
  • 1,363 Answers

It would be a safety switch up by blower assembly. typically has red reset button.

Posted on Sep 16, 2015

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Posted on Jan 02, 2017

  • 306 Answers

SOURCE: furnace has does not ignite flame

how often do you replace your filter?

On the limit switch that protects your unit when it gets to hot the number one reason is dirty filter.

The pressure switch is located in the upper side of cabinet has a rubber hose connected to it. They very rarely go out though. So find your vent fan the first fan that comes on and follow the rubber hose to the switch.

Posted on Feb 11, 2009

SOURCE: How do I remove the limit switch from my old furnace?

Sounds like you took a hit from a capacitor. That is the only thing that could Zap you if you are sure all power is off. Usually capacitors hold a charge if their is no resistor/ bleeder on it. Find your capacitor(s) round or oval with wires coming off the top. DISCONECT POWER TO UNIT. Short across the terminals on all capacitors with a screw driver to release charge. Do not touch metal part of screw driver while doing this. Then remove your wires form your limit with insulated insulated needle nose pliers.

Posted on Nov 02, 2009

  • 1033 Answers

SOURCE: i have a intertherm furnace

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.

Posted on Feb 09, 2011

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1 Answer

My Xenon high efficiency furnace has a red blinking led light that blinks 4 times and my furnace will not light. What could be the problem?


Gas furnace fault or error codes for common furnaces - Gray ...

www.grayfurnaceman.com/-ifc-failure-codes.html
Each color will also flash a specific number of times to signify a specific error. ... 4 redcolored flashes may be signaling that the "high-limit" switch might be open. ... 3 green colored flashes on your furnace has the same meaning as 2 green colored flashes. ....If a system problem occurs, a blinking LED shows a fault code.Missing: xenon

7 Tips and Tricks to repair your Furnace DIY - YouTube

? 13:25
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Dec 18, 2012 - Uploaded by JRESHOW .
Flash sequence codes 1 through 11 are as follows: LED will turn "on" ... 4 RED FLASHES: This indicates that the main limit switchhas opened ... This no-light condition occurred 3 times (2 retries) during .... My furnace trane xe80 is only flashing once my manual says something about flame being locked out ...Missing: xenon ‎efficiency

Nov 21, 2015 | Heating & Cooling

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Do not get 24 volts from 120/24 volt transformer how test it?


Yes. There could be a couple of high limit safety devises in the circuit that can open the circuit to the gas valve. Pending your furnace type If your thermostat is calling for heat and the furnace tries to start your transformer is working. High limit safety controls are normally closed. If you have a open limit switch you will not have any continuity through it using an ohm meter or if you test it with a volt meter you will have 24 volts across the terminals of the safety devise. Other problems can be pressure switches, hot surface igniters and control boards. most newer furnaces have a control board that will flash a light code to help trouble shoot the system. Count the flash pattern and look on one of the furnace doors for the flash code directory.

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Intertherm Furnace Model #mmhb070abhr06. Burner lights up but shuts down after about 10-30 seconds then recycles over & over again when fan is set to auto (because fan does not cycle on when set to...


Sounds to me like it is going off on a weak high limit switch. With the fan on it will prolong the event but will not stop it. I would check all of the high limit switches. It would most likely be one close to the heat exchanger.

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Limit switches are safeties and require a manual reset. They are also a Normally Closed contact. A hi temp. thermostat operates on its own. If you are sure it is a limit, find the red little button and listen for it to click. Sometimes they push pretty hard.

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The sure don't make things like they use to. The only thing I would think is that the drier is getting too hot or the switches are poorly made. Might check the exhaust duct or see if you can find a better quality limit switch.

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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.

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1 Answer

Intertherm mmha070


Hi, did he bypass the high limit to see if it was bad? Sounds like you are getting false codes and you have a problem in your module or main board, which ever you have. The way it is acting, saying the high limit is open but the tech says its not, I would change the board.
Shastalaker7

Nov 14, 2011 | Intertherm P3RA-048K Air Conditioner

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 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

1 Answer

Hi, the lights on my circiut board are flashing the one on the left is on all the time and the one to the right of it flashes two times and then waits and then flashes two times again


Error Codes
A green LED indicates system faults
Steady On: System OK
Steady OFF: Board control fault or no power applied
1 Flash: Ignition failure (control in one-hour lockout)
2 Flashes: Pressure switch fault, fails open (switch is
stuck open)
3 Flashes: Limit switch open (main or auxiliary)
4 Flashes: Pressure switch fault, fails closed (switch is
stuck closed)
A yellow LED indicates flame status
Steady on: Normal flame is sensed
Flashes: As flame weakens, frequency of LED flashes
increases

hope this is helpful.

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