Question about Heating & Cooling
Recently replaced the Johnson ignition control module with Lennox 30W33 OEM Ignition Control Kit with a new flame sensor. It cured the cycling problems, but now the fan doesn't go on in automatic mode after the furnace fires up. After a few minutes the burners go out. When I put the fan in manual mode, everything works fine. What's up!!
Posted by Anonymous on
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Posted on Jan 02, 2017
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
Here is a link to the manual for your unit heater:
The 4 flashes is a high limit or roll out switch is open. There are 2 or 3 little brown or black button looking switches with a little button on the top and a wire attached to each side. Press the button on each, you may hear a slight "click". If you do, that is the one that was open. Hope this helps.
Posted on Nov 04, 2009
SOURCE: lennox intermitent flame problem
Yes the flame sensor is not allowing the ignitor to start, you will need to remove the flame sensor, and clean the black carbon build up from the stem of the flame sensor, replace the flame sensor and turn the furnance back on, this will correct the problem.
Posted on Dec 14, 2009
I have a Lennox G40UH furnace. The burners fail to ignite about every 5th time. The furnace will try to ignite the burners then shut down. Once in a while the temp will drop down to 62 then fire up. I have only gotten a Diagnostic code once "Watchguard - burners fail to ignite" once I shut the power down and it started.
The furnace is clean, 5 years old, the flue is not clogged.
Posted on Jan 03, 2010
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