Carrier 38KLE39-C - Self-Diagnostic Function; 14-1 Introduction; 14-2 Explanation of Self-Diagnostic Function; 14-3 Self-Diagnostic Function Description for Heat Pump Systems

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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
th
retry failure).
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 (4) Compressor Drive
(2) Indoor Coil Sensor (5) Reversing Valve
(3) Outdoor Coil Sensor
No.
(Rank)
Error
Contents
Flashing
Frequency
Allowed
Modes
1 Return Air Sensor Malfunction 2 Fan Only Mode
2 Indoor Coil Sensor Malfunction 3 Fan Only Mode
3 Outdoor Coil Sensor Malfunction 4 Fan Only Mode
4 Compressor Drive Malfunction 5 Fan Only Mode
5 Reversing Valve Malfunction 6 Fan Only Mode
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 (3) Compressor Drive
(2) Indoor Coil Sensor
No.
(Rank)
Error
Contents
Flashing
Frequency
Allowed
Modes
1 Return Air Sensor Malfunction 2 Fan Only Mode
2 Indoor Coil Sensor Malfunction 3 Fan Only Mode
3 Compressor Drive Malfunction 5 Fan Only Mode
NOTE
If more than two errors, the highest rank codes are displayed.
If the highest rank error is cleared, the next rank error codes are displayed.
C
C
O
O
M
M
P
P
T
T
I
I
M
M
E
E
R
R
U
U
N
N
I
I
T
T
O
O
N
N
P
P
O
O
W
W
E
E
R
R