Hitachi RWM-(H)FSN3E, Руководство по обслуживанию

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12 Troubleshooting
SMGB0070 rev. 1 - 08/2011
388
Alarm code
70
Hydraulic alarm
• The alarm code is displayed on the LCD User interface.
• The alarm code is displayed on the seven segments of the indoor unit PCB.
• This alarm code is displayed when there is a flow or pressure failure (water flow too low) (water pressure to low).
No
Check fuse EF4
Check for correct wiring
Yes
Yes
Is water pump
1 running?
Faulty water pump1
Are the all water circuit
valves completely open?
Restart operation
Voltage in
water pump1?
No
No
Open it
Are the water
filters clean?
No
Clean it
Check the manometer to
make sure there is sufficient
water pressure
Yes
< 1 bar
Charge water
Check to make sure there is
sufficient water flow
> 1.5 bar
P70 protection
• See Unit installation chapter
• See Water pump configuration chapter
• Make sure there is no air in the system
• Check to make sure the expansion vessel is not broken
No P70 protection
Check continuity in water
flow switch
(when water pump is ON)
No
Faulty water flow switch
(Replace it)
Check continuity in water
pressure switch (when water
pump is ON)
Yes
No
Faulty water pressure switch
(Replace it)
Faulty PCB1 (Check PCB)
Contact your local leader.
Yes
Yes
Alarm control procedure:
- Perform retry operation for 6 minutes the first time (Seven-segment shows P70) and keep Outdoor and Indoor Unit
running (except Electrical Heater). After 6 minutes have passed (P70), Switch Stop status OFF for Outdoor and
Indoor Units