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12 Troubleshooting
12.1.4 Troubleshooting using the 7 segment display (outdoor unit)
Simple checking by 7-segment display
Turn ON indoor unit connected to
1
the outdoor unit
2
Turn ON the outdoor unit
3
Auto-addressing starts
Outdoor unit, circuit board, PCB1
Checking method by 7-segment display
Operating conditions and each part of refrigeration cycle can be checked by 7-segment and push switches (PSW) on the
PCB in the outdoor unit. During checking data, do not touch the electric parts except for the indicated switches because
220-240V is applied to them. Pay attention not to contact the tools with electrical parts. If contacted, electrical parts will be
damaged.
Y52C
8
8
Y20B
Y20A
FAN2
Manual
8
8
defrost
.
.
SEG1
PSW1 PSW2 PSW3
399
SMGB0070 rev. 1 - 08/2011
During auto-addressing, the following items can be checked using
the outdoor unit's on-board 7-segment LED display:
1 Disconnection of power supply to the indoor unit.
2 Reverse connection of the operating line between the outdoor
and indoor units.
3 Duplication of indoor unit number.
• To start checking, press PSW2 switch for more than three seconds.
Y21
• To proceed checking, press the PSW2 switch.
• To back to the previous item, press the PSW3 switch.
FAN1
• To cancel this checking, press the PSW2 switch for more than 3
seconds.
YCH
PSH
12
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- Service Manual
- General Information
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Troubleshooting
