patrick o
Feb 5, 2013, 11:28 AM
I have 141-50a mueller climatrol furnace it was working fine now it whistles when I turn heat on what's wrong
ballengerb1
Feb 5, 2013, 01:59 PM
Do you have a small switch on your stat that can operate the fan ON or AUTO?
ma0641
Feb 6, 2013, 05:44 AM
Some models have a whistle signal when the filter is dirty and needs changing.
wmproop
Feb 6, 2013, 11:25 AM
What whistles? The Tstat or the furnace?