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UTILITY RELAY *
UTILITY SIGNAL
'_ OPEN RELAY
* SUPPLIED BY UTILITY PROVIDER
Lql_id Ilne So lellold
A05247
Fig. 18 - 2-Stage HP/AC Control Board
STATUS CODE 21 - GAS HEATING LOCKOUT
Control will NOT auto reset. Check for
STATUS CODE 22 ABNORMAL FLAME-PROVING SIGNAL
Flame is proved while gas valve is
until fault is cleared. Check for leaky gas valve or
STATUS CODE 23 - PRESSURE SWITCH DID NOT OPEN
Check for obstructed pressure tubing or pressure switch stuck closed.
STATUS CODE 24 - SECONDARY VOLTAGE FUSE IS OPEN Check for short circuit in secondary voltage (24VAC) wiring.
STATUS CODE 25 - INVALID MODEL SELECTION OR SETUP ERROR
Indicates either the model plug is missing or incorrect. If code
flashes 4 times on
STATUS CODE 31, 32 - PRESSURE SWITCH OR RELAY DID NOT CLOSE OR REOPENED
Control relay may be defective. If open longer than five minutes, inducer shuts off for 15 minutes before retry. If open during blower
inducer motor, defective pressure switch, lower inducer voltage
(230VAC), inadequate combustion air supply, disconnected or
obstructed pressure tubing, or low inlet gas pressure (if LGPS used).
STATUS CODE 33 - LIMIT CIRCUIT FAULT
Indicates a limit or flame rollout switch is open. Blower will run for 4 minutes or until open switch remakes, whichever is longer. If
open longer than 3 minutes, code changes to lockout 13. If open
less than 3 minutes status code 33 continues to flash until blower shuts off. Check for loose blower wheel, restricted vent, excessive
wind, dirty filter or restricted duct system, defective switch or
connections, or inadequate combustion air supply (flame
STATUS CODE 34 - IGNITION PROVING FAILURE
Control will try three more times before lockout 14 occurs. If flame
signal lost during blower
the selected blower
(.5 microamps D.C. min.,
low inlet gas pressure, control ground continuity, gas valve
defective or turned off, flame sensor must not be grounded,
inadequate flame carryover or rough ignition, or green/yellow wire must be connected to unit sheet metal.
STATUS CODE 41 - BLOWER MOTOR FAULT
Indicates the blower failed to reach 250 RPM or the blower failed
to communicate within the prescribed time limits. Thirty seconds
after being turned ON or ten seconds during
STATUS CODE 45 - CONTROL CIRCUITRY LOCKOUT
Auto reset after one hour lockout due to gas valve relay stuck open, flame sense circuit failure, or software check error. Reset power to clear lockout. Replace control if status code repeats.
E. HP/AC Control Troubleshooting
See Table 4 for HP/AC control board status codes and
troubleshooting information.
STATUS CODE 53, OUTDOOR AIR TEMPERATURE
SENSOR FAULT - DETAILED DESCRIPTION
If an OAT sensor is found at
to be within a valid temperature range. If sensor is found to be
open or shorted at any time after initial validation, Status Code 53
will be displayed at amber STATUS LED.
Check for faults in wiring connecting sensor to OAT terminals.
Using an Ohm meter, check resistance of thermistor for a short or open condition.
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