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Lennox 42W43 Control Board
Most systems will not activate unless the control board is configured and seated properly. The control board is constructed to command the gas valve, the igniter, all the various sensors as well as the air circulator all together. It is imperative that you select wisely when you choose a replacement due to variances between brands, models and types of systems. The proper control board must be compatible with the brand and the model of furnace or air handler you have.
What are the indications that my main circuit board is on its last leg?
- There is a strange code randomly appearing somewhere on the board
- The board has to be turned off and back on quite frequently for the system to operate once again
- The AC or furnace will not function at all
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Before you decide on buying or purchasing any Lennox 42W43 replacement part, do your due diligence and cross-check the correct model as well as make a visual comparison in order to be sure the correct control board is being ordered. There is no rule that says you have to install the replacement part alone. Hire someone with experience in your area to pay to install it for you.
Feel free to download your manual for help.
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