Question about Intertherm Gas Furnaces - M1GB-056-AA

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Heat wont come on

The heat will not come on. i checked the thermostat but it looked fine. i switched the switch beside the blower from auto to on. the blower came on but no heat

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  • 23 Answers

Check and see if pilot is on

Posted on Mar 24, 2014

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Posted on Jan 02, 2017

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SOURCE: AC, but no heat

The clicking noise appears to be the igniter. Since it is not getting gas for some reason it will not operate and will shut down. This could be due to the burners being dirty or it could be a bad gas valve or it could be in the electronic mudule. Make sure there is gas coming into the home to the gas valve.Since you hear the igniter operating , for the time being we will assume it is ok. Clean the burners with a wire brush. Make sure they are clean. When reinstalling the burner. Make sure the igniter is directly over one of the burners in the path that the gas will take. This is important. Before attempting any repairs make sure you understand what to do and what not to do. Gas furnaces can be vary dangerous. If this is something you are not absolutely sure you can do. Get a qualified service man to repair and service the unit.You can get a qualified service man right here on this site for your area. I hope I have been of some help to you.

Posted on Nov 19, 2008

  • 6 Answers

SOURCE: I have an intertherm electric furnace FEH-A020,

The model of T-stat you gave comes up as a discontinued model on Honeywell's web site, but it looks to be a manual stat that type of stat would have to be wired with a summer winter switch with electric heat, allowing it to turn on the fan with a call for heat. If yours is a programmable T-stat you would need to select electric heat or in the installers set up change the default setting for fan from unit controls fan in heat to thermostat controls fan.

Posted on Nov 02, 2009

  • 767 Answers

SOURCE: I'm not getting any heat, found a burnt wire and

The fan relay that turns the thermostat on is probably burnt out as this probably controls the electric heat banks.

Posted on Jan 11, 2010

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1 Answer

I have a lennox pulse 21 And if i set the thermostat to auto the unit kicks off after a min and the limit switch goes over 200. But if i keep the fan on the unit works fine.


See if you blower speed is set to low speed in the heat mode.
I think what might be happening is the blower is set to low speed in heat and when you switch to automatic, the blower is switched to high speed. You may have to change the blower speed to high in the heat mode. If not you may have an airflow problem such as a Dirty filter, ducts not sized right, dampers on the room outlets closed.

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I would look to replace a relay that is not shutting off or replace the thermostat itself.

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Eb20b/ electric furnance/ blower wont shut-off after heat kicks out, got to kill breaker , runs all the time, installed new thermostat, no change?????? Its cold??????


Check the thermostat and make sure the fan switch is set on "Auto". If it is set on "ON" the blower will run constantly.

Jan 31, 2015 | Heating & Cooling

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My blower motor wont turn off in my furnance?


check the fan setting on your thermostat. On means always on, auto/int means only comes on during heating/cooling. if the thermostat is set to auto / int and the fan keeps running? you may have a bad fan relay switch. It may be integral on the primary control board of your unit.

Sep 04, 2014 | Heating & Cooling

1 Answer

The thermostat is set but the heat wont come on


This seems to be a pretty general issue. Have you recently changed the thermostat? There might be a chort from the thermostat to the furnace. There may be an issue with the furnace itself. Take the switch on the Thermostat labeled FAN and switch it to ON. There should be 2 setting for this switch-AUTO and ON. Switch to ON and see if furnace blower starts. If it does, we need to dig a little deeper to reveal your issue.

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1989 Buick Park Ave heating problems. I got this car a few months ago and it was great,...now having problems. The heating/AC control unit works fine, there was however a toggle switch controling the...


check to see if there is a resistor on the blower motor. it should be located either beside or underneath the blower motor.. if that is bad it wont let you select different fan speed settings and if it goes completely out the blower will not work at all.

Feb 12, 2010 | 1989 Buick Park Avenue

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I have an intertherm electric furnace FEH-A020, with multispeed blower installed when A/C added. My problem is blower operation. at the end of the cooling season with fan set to auto operation the fan ran...


The model of T-stat you gave comes up as a discontinued model on Honeywell's web site, but it looks to be a manual stat that type of stat would have to be wired with a summer winter switch with electric heat, allowing it to turn on the fan with a call for heat. If yours is a programmable T-stat you would need to select electric heat or in the installers set up change the default setting for fan from unit controls fan in heat to thermostat controls fan.

Oct 17, 2009 | Intertherm P3RA-048K Air Conditioner

2 Answers

The fan in the airhandler wont shut off.


The fan is controlled by a blower timer board located inside the air handler, or on older units it has a relay called (of all things) a blower relay. If these items were at fault I doubt removing the thermostat would cause the blower to go off. if bad causing this problem the blower would continue to run even with thermostat removed.

But it is also controlled by the thermostat.

You mentioned that if you remove the thermostat it cuts off. There are 2 switches on most thermostats.
1 has Cool, Off, Heat, and Emergency Heat (on a heat pump stat)
2 The other switch has On and auto (it is for the fan motor only)

I believe because it stops when you remove the thermostat that the switch on the fan is set to on possibly. It should be on auto-matic. This way the fan motor only come on with cooling or heating. If in the on it stays on all the time. If this is the case just switch to AUTO.

Or the thermostat may be wired wrong. The G terminal is where the fan motor gets instructions from the thermostat. Make sure its on G at the stat and the correct wire at the blower coil is being used for the corresponding wire going from the stat to the blower for G. Don't confues G for green it could be any color. The terminals are not for color but it makes more sence to make them color - letter identified. On the other end soemtimes the wires are not colored the same so look carefully.

Also a whisker of a thermostat wire could be touching inside the thermostat and causeing the motor to run 100%. Look carefully at this and see if it has too long of thermostat wires stickinhg on out under the screws to where they may tough other things.

If neither things stop or show the problem and it deffinately stops when thermostat is removed the thermostat is most likely bad.

If this helps you 1 way to make the repairs your\self or helps you realize you need a technician please rate mne as high as you can.

May 14, 2009 | Heating & Cooling

1 Answer

Continuos running blower


hi! there,
blower auto shutting off and on is dependent to thermostat setting,if the thermostat acquired the temperature set it will shut of your blower,checking thermostat performance switch off unit, set this to a lower setting 1 or 0 switch on this should not runof course,if you set up this to 200 this will run until temperature reached to 200 it will stop.when you set up to 1 or 0 and the blower run thermostat is defective.
fan blower relay, if the 3 contactor is short or permanently engage while themostat reached acquired temperature your blower will still running,defenitely relay is defective.relay is dependent to thermostat switching,it supply holding coil terminal is to lock the 3 contactor to supply source to your blower.
so two common option while your blower run continously
1. shut off breaker, disconnect thermostat on two leads,its like a switch.then switch on breaker and run unit.
observe if run, your relay is defective,it was shorted on 3 contactor.
thermostat is the key to run your blower.
2. if the blower not run when you switchn onunit,then switch off again and try to short or connect the two lead using alligator clip on both side,or have it clip the terminals,then switch on again if the blower run,your themostat is defective,the high volatile of filler bulb was leak it always switch on,no play at all to off and on.
have a nice day,don't forget to rate me,thank's
ideas came from actual and theoritical analysis base on experienced and my study of industrial intrumentation.this will guide you and help you,if you understant flow of current in circuit.
have a nice day

Apr 11, 2009 | Ruud UBHC Air Conditioner

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