Limit Switch Testing: Honeywell L4068

Old 10-31-12, 08:27 PM
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Limit Switch Testing: Honeywell L4068

I have an old furnace where the motor gave up, so had it replaced. However, now the Fan runs also on AUTO and ofcourse at ON. The fan should not run on AUTO unless the limit switch asks it to. How can I test if the limit switch is good and the main reason behind fan running on auto is to do with wiring. Thanks.

Also, the new motor is running but I hardly feel any draft one story above. Is it that the belt to the blower is not too tight, so the RPMs on motor are not translated to the blower.
Old 10-31-12, 08:50 PM
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Check to see if the fan is running backwards. Motors can often be adjusted to turn either way, and you make need to make the change if yours is turning the wrong way.

If the fan is turning the wrong way, the furnace is probably still overheating.

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