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Lennox model 80MGF3-75A-2 Furnace will not come on. Where do I start

Thermostat telling unit to come on but will not start. Error code say "rollout switch open"

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  • 23 Answers

Http://www.ehow.com/info_12194827_led-codes-lennox-80mgf-furnace.html

Posted on May 15, 2014

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Posted on Jan 02, 2017

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The HVAC Guy
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SOURCE: Coleman Evcon Furnace Model G8T10012UHB11A

you probably have a cracked heat exchanger which is causing the rollout switches to trip.even the tiniest of cracks will cause the fan to blow the flame back into the unit and cause them to trip. check the heat exchanger for even the tiniest of cracks if so replace it. and be sure to have a carbon monoxide alarm in your home.

Posted on Oct 30, 2008

  • 80 Answers

SOURCE: I have just replaced my HVAC Control board &

Once you have installed the jumper, you will need to kill power to the furnace for about a minute to reset the board. Make sure the the jumper is making good contact. Sometimes they appear to be plugged in but still are not making contact.

Posted on Oct 04, 2009

alicantecoli
  • 22326 Answers

SOURCE: will not start up has

i think it is a igniter failure but as its a gas appliance i would not recommend a home repair because if its not correct and you play with something and their is an explosion then your house insurance is invalidated ,also you could kill yourself if the flue is blocked with carbon monoxide the best advice here is to call a certified engineer and pay the bill ,also to get him to check it over so you obtain a certificate as if anything does happen you are covered on the insurance then.

Posted on Dec 10, 2010

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you probably have a cracked heat exchanger which is causing the rollout switches to trip.even the tiniest of cracks will cause the fan to blow the flame back into the unit and cause them to trip. check the heat exchanger for even the tiniest of cracks if so replace it. and be sure to have a carbon monoxide alarm in your home.

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