Carrier Infinity 48XT A Series Installation Instructions Manual page 17

D. Furnace Control Troubleshooting
Furnace control faults indicated by flashing codes on the amber
system STATUS LED can be resolved using troubleshooting
information provided below. Codes are listed in order of their
priority, highest to lowest. Though multiple faults can exist at any
time, only the highest priority code will be displayed on STATUS
LED. Clearing the indicated fault when multiple faults exist will
cause the next highest priority Status Code to be flashed. All
existing faults, as well as a fault history, can be viewed at UI.
STATUS CODE CONTINUOUS OFF
Check for 230 VAC at L1 and L2, and 24 VAC at SEC- -1 and
SEC- -2.
STATUS CODE CONTINUOUS ON
Control has 24 VAC power.
STATUS CODE 11 - - NO PREVIOUS CODE
Stored status codes are erased automatically after 72 hours.
STATUS CODE 12 - - BLOWER ON AFTER POWER UP
(230 VAC or 24 VAC) Blower runs for 90 seconds if unit is
powered up during a call for heat (R- -W/W1 closed) or (R- -W/W1
opens) during blower on- -delay period.
STATUS CODE 13 - - LIMIT CIRCUIT LOCKOUT
Lockout occurs if a limit or flame rollout switch is open longer
than 3 minutes or 10 successive limit trips occurred during high
heat. Control will auto reset after three hours. Refer to status code
33.
All manuals and user guides at all-guides.com
Fig. 16 - - Detail of Furnace Board
STATUS CODE 14 - - IGNITION LOCKOUT
Control will auto reset after three hours. Refer to status code 34.
STATUS CODE 15 - - BLOWER MOTOR LOCKOUT
Indicates the blower failed to reach 250 RPM or the blower failed
to communicate within 30 seconds after being turned ON in two
successive heating cycles. Control will auto reset after 3 hours.
Refer to status code 41.
STATUS CODE 21 - - GAS HEATING LOCKOUT
Control will NOT auto reset. Check for mis- -wired gas valve or
defective control (valve relay).
STATUS CODE 22 - - ABNORMAL FLAME- -PROVING
SIGNAL
Flame is proved while gas valve is de- -energized. Inducer will run
until fault is cleared. Check for leaky gas valve or stuck- -open gas
valve.
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