Self Diagnostic Function - Carrier 53KLE-H SERIES Service Maintenance Manual

14. SELF-DIAGNOSTIC FUNCTION
14-1 INTRODUCTION
- Self-diagnostic function is the key for success of air conditioner.
- The printed circuit boards existing inside the indoor unit are equipped with self-diagnostic function to detect
malfunction and automatically stops the operation at the air conditioner.
14-2 EXPLAINATION OF SELF-DIAGNOSTIC FUNCTION
Once a malfunction is detected, the diagnostic control section will force the system mode to OFF for 3
minutes. After the OFF delay, system mode releases and allowed returning to its normal state. The system
will be allowed to restart on its own. The diagnostic control section will allow the system to fail 5
consecutive times before shutting down the system. If the system is performing an active defrost, both the
compressor drive and reversing valve malfunction test will be cancelled and reinitiated after the following
compressor OFF-ON cycle. The Unit on lamp is scanned every half-second and the error codes are
displayed by the flashing frequency of unit on lamp. The error codes are displayed during SHUT-OFF (3
minutes off and after the 5
14-3 SELF-DIAGNOSTIC FUNCTION DESCRIPTION FOR HEAT PUMP SYSTEMS
The self-diagnostic function included in the control system detects malfunctions of the following
components:
(1) Return Air Sensor
(2) Indoor Coil Sensor
(3) Outdoor Coil Sensor
No.
(Rank)
1
2
3
4
5
14-4 SELF-DIAGNOSTIC FUNCTION DESCRIPTION FOR COOL ONLY SYSTEMS
The self-diagnostic function included in the control system detects malfunctions of the following
components:
(1) Return Air Sensor
(2) Indoor Coil Sensor
No.
(Rank)
If more than two errors, the highest rank codes are displayed.
If the highest rank error is cleared, the next rank error codes are
retry failure).
th
(4) Compressor Drive
(5) Reversing Valve
Error
Contents
Return Air Sensor Malfunction
Indoor Coil Sensor Malfunction
Outdoor Coil Sensor Malfunction
Compressor Drive Malfunction
Reversing Valve Malfunction
(3) Compressor Drive
Error
Contents
1 Return Air Sensor Malfunction
2 Indoor Coil Sensor Malfunction
3 Compressor Drive Malfunction
U N I T O N
U N I T O N
T T I I M M E E R R
C C O O M M P P P P O O W W E E R R
Flashing
Frequency
2
3
4
5
6
Flashing
Frequency
2 Fan Only Mode
3 Fan Only Mode
5 Fan Only Mode
NOTE
20
Allowed
Modes
Fan Only Mode
Fan Only Mode
Fan Only Mode
Fan Only Mode
Fan Only Mode
Allowed
Modes
displayed.