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dday55281
Dec 3, 2008, 02:41 PM
Have a Carrier Gas Furnance Model #58MSA. Has stopped working and code #23 comes up, which the owners manual states have service call. Live in area where service calls are hard to come by and am also a DIY type of person. Any suggestions. Thanks Steve
hvac1000
Dec 3, 2008, 03:49 PM
Look on the back side of the blower access door for a legend as to what exactly the code 23 means.

I am guessing pressure switch stuck closed but that is just a guess.

If code 21

21 GAS HEATING LOCKOUT - Control will NOT auto reset.
Check for: - Mis-wired gas valve -Defective control (valve relay) (circuit board)
mygirlsdad77
Dec 3, 2008, 04:30 PM
just waiting to see what code 23 means. Then i will try to help. Make sure you are reading the blinking lights correctly.