Service Manual

8. Troubleshooting
273
SMGB0079 rev.0 - 01/2013
8
Cancellation of Forced Thermo OFF (21)
Turn ON the power source and wait for more than 30 seconds. Then press PSW1 and PSW3 simultaneously for more than
3 seconds.
Forced thermo-OFF (indoor unit error code 21) will be cancelled.
However, this function may damage the compressor, use only on inevitable occasion.
• In case of using the remote control switch (PC-ART), the cancellation is also available with it.
• When “Operation Lock” indication ashes on the remote control LCD, press FAN SPEED and LOUVER switches si-
multaneously for more than 3 seconds.
• “Operation Lock” Indication is disappeared and operation is available.
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Cause of inverter stoppage (24)
Code Cause
Cause of Stoppage
for Corresponding
Unit
Remark
Indication
during Retry
Alarm Code
1
Automatic Stoppage of Transistor Module
(DIP-IPM Error)
(Overcurrent, Undercurrent, Temperature increase)
17 P7 53
2
Instantaneous Over Current
17 P7 48
3
Abnormal Inverter Fin Thermistor
17 P7 54
4
Electronic Thermal Activation (Inverter overcurrent)
17 P7 48
5
Inverter Voltage Decrease (Undervoltage)
18 P8 06
6
Over Voltage
18 P8 06
7
Abnormal Inverter Transmission
18 - -
8
Abnormal Current Detection
17 P7 51
9
Instantaneous Power Failure Detection
18 - -
11
Reset of Micro-Computer for Inverter
18 - -
12
Earth Fault Detection from Compressor
(Only Starting)
17 P7 53
13
Phase detection abnormality
18 P8 -
14
Inverter Non-Operation
18 - 55
15
Inverter Non-Operation
18 - 55
16
Inverter Non-Operation
18 - 55
17
Communication Abnormality
18 - 55
18
Protection Device Activation (PSH)
- - 02
19
Protection Detection Device Abnormality
- - 38
20
Early Return Protection Device
18 P7 53
21
Step-Out Detection
17 - 31
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Table of capacity codes of indoor unit
Code Equivalent horsepower
06
0.8
08
1.0
10
1.3
11
1.5
13
1.8
Code Equivalent horsepower
14
2.0
16
2.3
18
2.5
22
3.0
32
4.0
Code Equivalent horsepower
40
5.0
48
6.0
64
8.0
80
10.0