The dial moves freely to position "On" and "Pilot" next to the red-marked indicator, but must be depressed to position "Off" next to the red-marked indicator. The switch is presently on "Off", which is next to the red-marked indicator on the left.
#Lennox furnace parts limit how to#
The previous tech that wanted to replace the board wanted over $1000 for the job! The part is about $100.Ĭan you please tell us how to relight the pilot light? A breeze must have blown it out. Video of it beginning to work, notice igniter glows orange (blooper): Ĭan someone please suggest what I can do next! I'm pulling my hair out, a tech coming out is just going to charge an arm and a leg. Video of description of what's been done/checked: Once the igniter comes on it will work for as long as needed. With this new board I can get it to work sometimes, about 40% of the time. Installed a new main board and the issue seems to be about the same. Three months later the problem has returned but behaves a bit differently.Ī.
Replacing or bypassing the pressure switch does not solve the issue
#Lennox furnace parts limit manual#
Emerson 3L02-200 Snap Disc Limit Control with Manual Reset. Thermostat is bypassed during troubleshooting (R and W bridged)į. Ultra Durable 52W29 Furnace Flame Sensor Replacement Part by Blue Stars - Exact Fit For Lennox, Armstrong & Ducane Furnaces - Replaces 52W2901 LB47940A 31L71 31L7101. Verified Igniter has ~58ohm, all temp safety switches pass continuity test.Į. These are factory original parts I bought a original cam stat fan limit switch from the Lennox dealer HVAC Technician: airheatman, HVAC Technician replied 1 day ago I would remove the fan limit from the chamber and stick a metal probe thermometer in the hole.
Removed inducer motor, lubricated/cleaned and new gasket was made.ĭ. Verified there is no blockage in exhaustĬ. This is was done after a tech came out and fully looked it over and said for sure it is the main board.ī. It worked flawlessly for these three months.Ī. It often would flash nearly instantly the three flashes. 3 months ago the main board was replaced because it was failing to start (killing the inducer motor after a few seconds, killing gas after one minute, not starting at all, etc and throwing a three LED blink), three LED flashes but the problem behaved differently. This indicates that there is a problem with the pressure switch. new oem lennox/ducane/armstrong 21l8901 21l89 l240-30f furnace main limit switch 4. Installed ~6 years ago, the tech never registered it so I do not have a warranty.Ĭurrently it has an issue where the inducer motor will start and most of the time (70%) I'll get a three blinking LED. Read countless threads regarding my furnace with a three blinking issue.
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