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Lennox 80uhg3-75a-3 igniter sometimes doesn't light , left LED slow flash, right LED solid.

Heater shows coming on at Thermostat and Blower Comes on and Blows but no heat. I went to the attic to take a look, I've seen control boards "blow". No black marks, fuse is good. But everything back and it worked for a day and then stopped again same symptoms. Furnace is mounted on it's side so left LED = bottom, right LED = Top if it were mounted upright.

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Should be a trouble code on the panel or in the literature book that came with unit. More than likely it's on the inside or outside of the blower panel. This will indicate Red light on Green light slow flash = what trouble code or issue it's having. Most common problems with a gas furnace is the flame sensor needs cleaning. There is a little rod that sticks down into the flame when the burners ignite. It's the only thing the flames will come in contact with besides the furnace itself. It will have 1 wire connected to it. Clean that rod with a piece of light grit sand paper. Don't take much force to clean it so try not to damage it by shining it to look like new. Cycle and see if it will hang in there. Hope this helps!

Posted on Sep 17, 2017

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6ya staff

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Posted on Jan 02, 2017

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Anonymous

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SOURCE: Heater no longer works on auto fan, only manual fan

When you call for fan in auto ensure your getting 24 volts at pin on control board, if it is not energizing then there is a problem with the relay.. Before you change out the expensive control board, try the therm..

Posted on Dec 09, 2008

Anonymous

  • 288 Answers

SOURCE: Vulcan ducted heating not working

How many wires for the thermostat do you have? If you tell me I can help. The green flashing, instead of red, in my experience, means a thermostat problem.

Posted on Mar 05, 2008

22yooper

James Helmer

  • 828 Answers

SOURCE: Carrier Weathermaker gas 8000 will not ignite

Your hot surface igniter may be bad. It may be cracked which would prevent it from starting the burner flame.

Posted on May 22, 2008

Anonymous

  • 40 Answers

SOURCE: I have a Carrier 38tra048340

Blank screen sounds like a fried thermosat. Abrupt outages can affect certain types of thermostats. Make a jumper wire and jump across R and G. See if you get any action from anywhere. If a fan or compressor kicks in you know you have a burned out thermosat...

Posted on Jun 23, 2008

Anonymous

  • 1 Answer

SOURCE: Goodman GMS90904CXA Wont ignite, light blinks 3 times

I had the same problem, I had to remove the lower black rubber stopper right next to the exaust fan and hook up a drain to the unit, as soon as the water drained out the furnace fired right up.

Posted on Dec 11, 2008

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Lennox 80uhg3-75a-3 igniter sometimes doesn't light , left LED slow flash, right LED solid.


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