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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

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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

Furnace blowing cold air after replacing limit switch


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 safety thermostat switch keep breaking (opening) every 3 to 4 moths don't know why


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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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.

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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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Armstrong upflow,unit works intermittent problem,call for heat nothing happens,error code of 5 blinks then 6 blinks. i have no manuel, and the panels dont have the codes on them. anyone have access to the...


Armstrong

FAILURE CODES

LED Status Fault Description
Off
No Power to the System Control

Steady Flash (11 or more flashes with no pause)
Normal Operation (Standby or call for heat)

2 Flashes
Pressure Switch Closed When It Should Be Open

3 Flashes
Pressure Switch Stuck Open 30 Seconds or Longer After Call for Heat (System in 5-minute delay mode before next call for heat). On/off switch in "off" position during a call for heat will generate this code.

4 Flashes
Open Limit Switch or Limit Switch Circuit

5 Flashes
Flame Sense Signal Sensed Out of Proper Sequence

6 Flashes - pause - 1 Flash (see Note 1)*
Soft Lockout Type 1 (Failure to light within 4 trials for ignition)

6 Flashes - pause - 2 Flashes (see Notes 1 & 2)*
Soft Lockout Type 2 (Flame sense lost during run)

6 Flashes - pause - 3 Flashes (see Notes 1 & 2)*
Soft Lockout Type 3 (Pressure switch opened during run)

6 Flashes - pause - 4 Flashes (see Notes 1 & 2)*
Soft Lockout Type 4 (Limit or limit circuit opened during run)

6 Flashes - pause - 5 Flashes (see Note 1)*
Soft Lockout Type 5 (Flame has gone away after Error Code 5)

6 Flashes - pause - 7 Flashes (see Note 1)*
Soft Lockout Type 7 (Self-check failure)

10 Flashes* - SV9520H8034 only
Line Input Voltage Polarity Reversed

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1 Answer

Meaning of rudd furnace trouble codes


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

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2 Answers

I have a goodman GMP 125-5 furnace. I have


sounds like the primary limit typically behind the gas valve its larger then the others, rectangle in shape with 2 wires going to it. be careful if your bypassing limit this can create a very hazardous condition

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1 Answer

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.

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5 Answers

High limit switch open on armstrong furnace


If you know where the high limit switch is you can always cut the two wires and wire them together causing the limit to close. But what you have to watch out for is why the high limit is not closing. That means in your return air either you have a dirty return air duct, dirty filter, or you don't have all your registors open to allow the heat to escape the heat exchanger. Just watch over riding the system. The high limit switch should either be on or behind the blower, in the middle of the system right under the heat exchanger. any other questions about hvac just ask.

David

Mar 23, 2008 | Heating & Cooling

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