Question about Intertherm Gas Furnaces - M1GB-056-AA

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Intertherm gas furnace model# MGHA-070ABFC-05

Furnace wont kick on.. pilot is light but the burners wont kick on or the blower... checked thermostat and wire they are good .. is there a way to manually kick the furnace on? or jump past the relays to get it to turn on?

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Posted on Jan 02, 2017

koolbreezes
  • 540 Answers

SOURCE: What's the deal? Wont shut off or respond to thermostat. . .

Red= power........White=heat.............Green=fan.................(grey)-(yellow)=cool .....these are the connectons. Disconnect these wires from the thermostat and know that red/power is the only wire that send power to the thermostat, and the rest sends it back to the unit to call for whatever,, red--to . white for heat... red to green for fan .... &red to grey for cool! OK! Turn all your power on, and use a jumper wire from red / green for fan and see if the fan comes on! Then move the jumper wire from red to green , to red / to white for heat and the fan , wait for 3 minutes before removing and going to the next step. Then red /to grey for cool and check if the outside comes on. Either you have a wire touching past the insulations and making a connection, a bad thermostat ,oe excessive wire lead touching the next connection.Thank you very much!

Posted on Nov 05, 2008

koolbreezes
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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

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1 Answer

Intertherm MGHA-070ABFC-05 will not run/cool


Multiple problems. Eliminate thermostat first. Remove face from wall and turn on breaker. If fan still runs you have a bad board or bad relay. If fan outside is running compressor should be too. These operate on same contactor. Verify you are getting 24 volts to coil side of contactor. If odf stops working and contactor remains pulled in you have a bad motor. If odf motor stops working the compressor will shut off due to overheating.

Jun 07, 2016 | Intertherm Heating & Cooling

1 Answer

I have a MGHA-070ABFC-05 Gas Furnace and it not working properly, the thermostat has no power,and the heat and air isn't work,where can locate the filter I'm sure this is part of the problem.


Clearly not filter related. Speculation without actually looking at it is worthless. It could be anything from a fuse to the service switch or a loose cover. Make sure that the panels are square and secure to make the door-switch close. Also check your breaker panel and make sure that the unit has power. If tripped, reset it ONCE. If it trips again, call a professional.

Oct 10, 2015 | Filter Heating & Cooling

1 Answer

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

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.


hi,

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..

jm

Jul 04, 2017 | Heating & Cooling

1 Answer

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. Sometimes it shuts off and then you have to push the reset.


If you are talking about the FAN coming on and then going off:

It sounds like something is obstructing air flow thru the system--
Are the air filters well cleaned-- or replaced?

Another possibility,m is the Plenum Control switch-
Can you find the control that senses the heating of the air in the furnace--
It usually has some set points that determine when the fan turns ON and then Off.
Can you adjust them to a wider differential?
This determines the temeprature of the air discharging from the registers...

If you are talking about the Burner-- or the Gas fire:
(Shutting of and turning the burner back on short cycle?)
Then you have to adjust the High Limit control--
Can you find this control?
Sometimes it is tied in with the Plenum control (adjust as above..)

Look at your controls, and get back with us, so we can help more.

Mack B

Jan 10, 2011 | Heating & Cooling

1 Answer

I have an intertherm gas furnace and it will turn on but it takse almost an hour from the time i turn the heat up until it kicks on. I can hear the click and it sounds like the motor is humming. I have...


On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Jan 23, 2010 | Heating & Cooling

1 Answer

Furnace not kicking on when thermostat calls for heat


On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Jan 10, 2010 | 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

1 Answer

Weak flame in intertherm furnace


Ok, so we can rule out the ignitor. (standing pilot systems can develop problems that will cause such symptoms.)

Check the gas pressure, make sure you are getting 11 to 14 PSI.

You need that after the regulator all the way to the manifold.

Also check for cracks in the heat exchanger, causing the wind from the blower to distort the flame pattern enough to cause improper contact with the flame sensor.

Make sure the burners and flame channels are clean of rust, and dibri build up, allowing the flame to properly contact the sensors.

Jan 18, 2009 | Intertherm P3RA-048K Air Conditioner

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