UTILITY RELAY * |
UTILITY SIGNAL
OPEN RELAY
*SUPPLIED BY UTILITY PROVIDER
LLS |
Liquid Line Solenoid
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 is proved while gas valve is
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
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
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 42 - INDUCER MOTOR FAULT
Indicates inducer motor hasn’t started within a prescribed time limit. Check inducer motor and wiring.
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
22