Troubleshooting By Means Of The 7-Segment Display - Hitachi RAS-5HVRNM1E Service Manual

8 Troubleshooting

8.2.3 Troubleshooting by means of the 7-segment display

Simple checking by 7-segment display
• 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.
• Outdoor Unit, Circuit Board, PCB1
1 Turn ON all Indoor Units connected to the Outdoor Unit
2 Turn ON the Outdoor Unit
3 Auto-addressing starts
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
220-240 V (400 V in case of RAS-(4-6)HRNM1E, RAS-(8-12)HRNM and RAS-8/10HRNSE) is applied to them. Pay attention
not to contact the tools with electrical parts. If contacted, electrical parts will be damaged.
• To start checking, press PSW2 switch for more than three
seconds.
• To proceed checking, press the PSW2 switch.
• To back to the previous item, press the PSW3 switch.
• To cancel this checking, press the PSW2 switch for more than
3 seconds
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SMGB0060 rev. 1- 12/2010