Hitachi UTOPIA RAS-4HVRP2E - Checking by 7-Segment Display

10 Troubleshooting
Initial troubleshooting
SMGB0136 rev.0 - 07/2021
218
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).
PSW3
PSW3
PSW3
PSW3
PSW3
PSW3
PSW3
PSW2
PSW2
PSW2
PSW2
PSW2
PSW2
PSW2
Normal Mode Checking Mode
PSW2 for 3sec.
PSW2 for 3sec.
Index of
Check Item No. 1
Index of
Check Item No. 2
Index of
Last Check Item
Information
of Check Item No. 1
Information
of Check Item No. 2
Information
of Last Check Item
(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