Checking By 7-Segment Display - Hitachi UTOPIA RAS-4HVRP2E Service Manual

10 Troubleshooting
Initial troubleshooting

10.1.2.2 Checking by 7-segment display

• Turn ON the main power supply. Wait for more than 20 seconds to start checking.
• Checking Items
- Expansion Valve Opening
- Temperature Readings from Thermistors
- Number of Indoor Units Connecting in the Same System
• Check the locations of 7-segment and push switches.
• AC220~240V is applied to the PCB and electrical parts. Never touch electrical parts and wires without appropriate
personal protective equipment (PPE) when checking.
Check the operating conditions and each part of the refrigerant system temperature condition by 7-segment display
(SEG1) and push switches (PSW).
(A) To start the checking mode: Press PSWD2 for 3 seconds.
(B) To move the checking item forward: Press PSW2
(C) To move the checking item backward: Press PSW3
(D) To cancel the checking mode: Press PSW2 for 3 econds
218 SMGB0136 rev.0 - 07/2021
Normal Mode
PSW2 for 3sec.
PSW2 for 3sec.
PSW2
PSW2
PSW2
PSW2
PSW2
Checking Mode
PSW3
Check Item No. 1
PSW3
of Check Item No. 1
PSW3
Check Item No. 2
PSW3
of Check Item No. 2
PSW3
PSW2
PSW3
Last Check Item
PSW2
PSW3
of Last Check Item
Index of
Information
Index of
Information
Index of
Information