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Old 12-14-2010, 11:48 AM   #1
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lennox furnace


My lennox furnace will only work when the fan is on all the time. It will not come on when it is set on automatic fan. Do I need a new circuit board? Can I install it myself?

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Old 12-14-2010, 04:09 PM   #2
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lennox furnace


The way you test is to turn the heat on. Put a meter on the blowers heating speed tap and neutral. 45 seconds after the burners ignite you should have 120 volts present. No voltage is a board issue, yes voltage but no blower is a motor issue. Yes you can replace part yourself.

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