Hitachi UTOPIA RAS-4HVRP2E - Page 232

10 Troubleshooting
Initial troubleshooting
SMGB0136 rev.0 - 07/2021
230
Phenomenon
Cause
Check Item
Action (Turn OFF
Main Switch)
Check indoor unit indicating
alarm code “03” on wired
controller
Repair it according to
“ Service Manual” of
connected outdoor unit
Replace indoor unit PCB
Check that indoor unit
capacity is 0 in check mode
of outdoor unit PCB1
Repair it according to alarm
code “03”
Insufcient
Heating
Operation
Transmission
failure
Transmission
failure between
indoor unit and
outdoor unit
Insufcient
power supply to
indoor unit
Failure of indoor
unit PCB
Check wired controller LCD
or “RUN” indicator is turned
OFF