Hitachi UTOPIA RAS-4HVRP2E - Page 306

10 Troubleshooting
Troubleshooting in check mode
SMGB0136 rev.0 - 07/2021
304
P18
Inverter voltage anomaly retry
InsufcientvoltageintheInvertercircuit
When activating three times in thirty
minutes, alarm code "06" is indicated.
Excessive voltage in the Inverter circuit
When activating three times in thirty
minutes, alarm code "06" is indicated.
Inverter failure retry
The actual Inverter frequency is 0 Hz more than 3
seconds after the Inverter frequency is outputted
When activating three times in thirty
minutes, alarm code "55" is indicated.
P26 High pressure decrease retry
Pd < Ta / 130 + 0.1 MPa more than 4 minutes, or
Pd < 1.0 MPa more than 60 minutes
Ta: Ambient temperature
No alarm.
Ps: Compressor suction pressure; Pd: compressor discharge pressure.

Check method by checking mode
Operating conditions and each part of a system can be checked using the 7-segment display on the PCB1 in the outdoor
unit.
RAS-(4-6)HV(R/N)(C/P)2E (PCB2) RAS-(4-6)H(R/N)(C/P)2E (PCB1)
SEG1
DSW4
DSW2
DSW5
DSW7
DSW3
DSW6
DSW1
RSW1
PSW1 PSW2 PSW3
SEG1
DSW4
DSW2
DSW7
DSW3
RSW1
PSW1 PSW2 PSW3
DSW6
DSW1
7-segment
Display
7-segment
Display
Start setting Exit setting
Press PSW1 for 3 seconds
Press PSW1 for 3 seconds
? NOTE
Ensure the check mode is cancelled after the checks have been carried out.