Carrier 40MAHB Series - Outdoor Unit Error Code Diagnostics; Error Codes for 9 K-18 K Models; Error Codes for 24 K-36 K Models

40MAHB: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
15
DIAGNOSIS AND SOLUTION
Outdoor Unit Error Display
After the power is on, LED1 (blue color) flashes slowly (once per second) when the unit is in standby. The LED flashes quickly (twice per second) if
the unit has an issue.
Table 6 — Diagnostic Table Sizes 9K-18K
O (light) X (off)  (2.5 Hz flash)
Table 7 — Diagnostic Table Sizes 24K- 36K
NO. PROBLEMS LED3 (GREEN) LED2 (RED) IU DISPLAY SOLUTION
1 IPM malfunction or IGBT over - strong current protection  X P0 Page 28
2 Over voltage or too low voltage protection O O P1 Page 31
3 EEPROM parameter error O
 E5 Page 16
4 Inverter compressor drive error X  P4 Page 35
5 Inverter compressor drive error  O P4 Page 35
6 Inverter compressor drive error P4 Page 35
NO. PROBLEMS LED2 (GREEN) LED3 (RED) IU DISPLAY SOLUTION
1 IPM malfunction or IGBT over - strong current protection
 X P0 Page 28
2 Over voltage or too low voltage protection O O P1 Page 31
3 EEPROM parameter error O
 E5 Page 16
4 Inverter compressor drive error X
 P4 Page 35
5 Inverter compressor drive error
 O P4 Page 35
6 Inverter compressor drive error
P4 Page 35