Sinclair SCV-EB Series Service Manual page 49

5.6 E2 Troubleshooting
5.6.1 Digital display output
5.6.2 Description
 Communication error between hydro system PCB and user interface.
 Heat pump stops running.
 Error code is displayed on the refrigerant system PCB digital tube and user interface.
5.6.3 Procedure
Communication wires HA HB have short
circuited, disconnected or are
Communication wires HA HB are not
connected in a daisy chain
Wires between hydro system PCB and
electric control box communication
terminals block are loose
Interference from high voltage (220V or
Communication wires are close to a
source of electromagnetic radiation such
as transformer or strong fluorescent lamp
Electric control box communication
terminals block damaged
Replace hydro system PCB
E2
misconnected
No
No
No
higher) wires
No
No
No
Yes
Reconnect the communication wires
Connect the communication wires in a
Yes
daisy chain
Yes
Ensure the wires are connected properly
Ensure the communication wires and
Yes
high voltage wires are separated
Remove the source of interference, or
Yes
add additional shielding to the
communication wires
Replacing electric control box
Yes
communication terminals block
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