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Donna M
Feb 28, 2009, 09:47 PM
Have a Carrier Furnace and the blower won't shut off. My furnace will not heat since this has happened. Put in clean filter. Red LED reads 3 short and 3 long lights
wmproop
Feb 28, 2009, 10:04 PM
3 short and 3 long do you have a sheet glued to the inside of the door/cover,,the codes should be on it,
himeeh
Feb 28, 2009, 10:05 PM
sounds like the thermostate is stuck, not connected broken or fan switch is on constantly
KC13
Mar 1, 2009, 07:44 AM
Code 33 is a limit switch fault. You replaced the air filter - was the old one clogged? If so, the main limit switch may have been cycling the unit for some time, and could now be stuck open. There could also be a tripped auxiliary limit switch. If so, will require manual reset.