Hitachi mini-HNRQ1 Series Service Manual page 103

TROUBLESHOOTING
Alarm
45
Code
● The alarm code is flashed on the 7-segment display of the outdoor unit.
● The alarm code is displayed on the wired controller of the indoor unit.
★
If the high pressure (Pd) of the compressor is more than 3.8 MPa for a minute, the compressor stops.
The operation automatically restarts after three minutes. If this occurs again twice in the next 30 minutes,
this alarm code is displayed.
Activation of High Pressure Increase Protection
96