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DeeK01 11-07-2012 10:21 AM

Bryant Furnace wont blow heat!!!
Woke up this morning to a cold house, My unit is a Bryant Outdoor Heat & AC unti 2 years old, but only been running for about a year.

It is showing me codes: #2 Limit switch Fault, & #4 four consecutive Limit switch faults.

The ignitor/burnner works & I get a flame for about 20 seconds but the large fan never kicks on. The smaller fan the one that feeds the blower does work & just runs continusly. I have power cycled & i get the same results. Ime sure its from overheating due to the loss of air movment. At first look everything looks ok nothing burnt or fried.

Any sugestions why the larger fan is not working at all?

Bryant Model# 574DNWA24060AATP

Thanks in adavance!

HVACTECH96 11-07-2012 01:12 PM

Possible bad blower motor or circuit board.You should be able to turn fan on at tstat by moving switch from auto to fan on.My guess is bad motor because if you have
a limit fault, the fan should be on.Also make sure you dont have plugged filter.

DeeK01 11-07-2012 01:22 PM

Fan does not work in the on position & the filter is still clear.

Is there a way to check voltage going to the Fan so i could narrow down one or the other?

HVACDave 11-07-2012 04:14 PM

Could also check and see if main blower motor has a capacitor and that it is ok. You can just flip your fan switch on and give the blower wheel a little spin and see if the fan runs with a little help.

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