158
TROUBLESHOOTING
Error code
Contents Error detection / Judgment
RC
display
Outdoor control PCB
Code Sub code
EH 80 10 Engine coolant pump starting
failure
10 seconds after starting of the engine coolant pump, the pump
speed is lower than 1,400 rpm (min
-1
).
20 Engine coolant pump speed
failure
When any of the following occurs at engine coolant pump
operation:
1. Speed of lower than 1,400 rpm (min
-1
) is detected for 5 sec-
onds. OR
2. Speed of 3,700 rpm (min
-1
) or more is detected for 5 sec-
onds. OR
3. Speed of lower than 200 rpm (min
-1
) is detected for 2 sec-
onds.
30 IPM failure IPM driver error signal is detected for 30 milliseconds when
turning the engine coolant pump or fan motor ON. Or IPM driver
error signal of 10 milliseconds or longer is detected twice or
more in 1.4 seconds.
E1 40 0 EEPROM failure EEPROM failure occurs.
1 Outdoor unit model code failure Outdoor unit model code data setting failure
2 Programs do not agree between
outdoor main microcomputer
and engine microcomputer
Main microcomputer model code and engine microcomputer
engine code do not agree.
84 3 Communication failure between
outdoor main microcomputer
and engine microcomputer
Communication failure between outdoor main microcomputer
and engine microcomputer is detected for 5 seconds.
4 Communication failure between
outdoor main microcomputer
and I/F microcomputer
1. Communication from the I/F microcomputer can not be
received normally for 15 second. OR
2. Reception of error signal from the I/F microcomputer is
received for 15 seconds. OR
3. Other outdoor unit's communication error between main
microcomputer and I/F microcomputer is received for 15
seconds.
E3 86 0 Refrigerant high pressure
failure 1
The refrigerant high pressure sensor 1 detects the specified
high pressure or higher for 5 seconds during compressor
operation.
1 Refrigerant high pressure
failure 2
The refrigerant high pressure switch 1 or 2 OFF is detected for
1 second during compressor operation.
E4 88 0 Refrigerant low pressure
abnormality
Refrigerant low pressure of lower than 12 psi (0.08 MPa ) is
detected for 3 seconds during compressor operation.
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