Hydro Box
30
5 Common Malfunction and Troubleshooting
5.1 Error Code of Hydro Box
Error code
Content
Error code
Content
L4
Power supply overcurrent protection
JC
Water flow switch protection
L5
Freeze prevention protection
dd
Malfunction of solar power
temperature sensor
LJ
Function DIP switch setting error
dH
PCB board of wired controller is
abnormal
L8
Insufficient power supply
dF
Malfunction of upper water
temperature sensor inside the
water tank
LL
Water flow switch error
dJ
Malfunction of
return water
temperature sensor
LE
EC DC pump rotation speed error
dP
Malfunction of hydro box water inlet
pipe temperature sensor
LF
Shunt valve setting error
dU
Malfunction of hydro box water
outlet pipe temperature sensor
d2
Water tank lower water temperature
sensor error
dC
Setting of capacity DIP switch is
abnormal
Note:
When the outdoor unit is incurred to fault, the wired controller of hydro box will not display the
fault. When hydro box is incurred to fault, the wired controller of multi-split indoor unit will not
display the fault. When the outdoor unit is incurred to fault, you may run the hot water generation
temporally (Ensure that the hot water generation is started when there is water inside the water
tank).
5.2 Troubleshooting
Malfunction phenomenon
Possible causes
Solution
No effluent water
The water is stopped or the water
pressure is too low
Check
The water pipe is blocked
The valve of water inlet pipe is
not open
The outlet is cold water, or
the water is not hot
enough
The water temperature setting is
too low
Reset
The wired controller is failed
Contact with the local maintenance center
The heating time is too short
Continue to heat
The outlet water volume
changes
The tap water pressure is
unstable
Check
Freeze prevention
protection
Risk of freezing, as the water
temperature is too low
Maintain the energized or heating state for 30
minutes or longer to eliminate the freezing
After a period of
operation, the wired
controller reports error dU
1. There is air in the circulating
water channel. It is not
completely drained.
2. The water outlet temperature
sensor falls off.
1. Filling Water for exhausting Air of the
circulating water channel again
2. Check whether the temperature sensor on the
outlet water pipe of the hydro box falls off. If yes,
insert the temperature sensor back into the
temperature sensor casing of the outlet water
pipe.
