Sinclair SCV-EB Series Service Manual page 56

5.12 H0 Troubleshooting
5.12.1 Digital display output
5.12.2 Description
 Communication malfunction between main control board and hydraulic module board
 Heat pump stops running.
 Error code is displayed on the refrigerant system PCB digital tube and user interface.
5.12.3 Procedure
PQE plug on the PCB is loose
The connection between refrigerant
system PCB and PQE of hydro system PCB
The connection between refrigerant
system PCB and PQE of hydro system PCB
There is a source of strong
electromagnetic radiation near the unit,
such as high-frequency transmitter or
other high strength radiation device
Replace refrigerant system PCB and hydro
system PCB in turn
54
H0
No
is loose
No
is broken
No
No
Yes
Put the plug in tightly
Ensure the connection is well or change
Yes
the connection wire
Yes
Change the connection wiring
Yes
Remove the source of interference