Sinclair SDV 6 Service Manual page 74

8.1.12 b12, b14 - Error in 1# electronic expansion valve body, error in 2# electronic expansion valve body
Error display
Error impact
Error trigger
Error recovery
Possible cause
Troubleshooting
Digital display
The faulty IDU and other IDUs of the same system: operate normally.
ODU of the same system: operate normally.
 Return air temperature(T1) - Heat exchanger liquid pipe temperature (T2A) > Set value
 IDU EEV=0, ODU running in cooling mode and compressor speed ≠0
Automatic recovery
 The electronic expansion valve needle is stuck or clogged.
The electronic expansion valve coil is damaged and unable to drive the valve body.

 The IDU main control board is damaged.
b12/b14 (1)
the coil and fix it to the valve
body again. Is the fault
the coil and
re-energize. Is the error
the main control board
Is the fault
Replace the electronic
expansion valve body (the
interior of the body is
clogged or the valve needle
Note:
1. The error code corresponds to the following two situations:
1) If there is only one electronic expansion valve port on the main control board of the IDU, when
an internal leakage error occurs in the electronic expansion valve body connected to the EEV port,
the error code is b12.
2) If there are two electronic expansion valve ports on the main control board of the IDU named
EEV1 and EEV2, when there is a leak inside the electronic expansion valve body connected to
port EEV1, the error code is b12; when there is a leak inside the electronic expansion valve body
connected to port EEV2, the error code is b14.
Spot check interface query
Remove
Yes
cleared?
No
Replace
Yes
cleared?
No
Replace
Yes
cleared?
No
is stuck)
Display position
Panel or display box
Operate normally (loose coil)
Operate normally (the coil
cannot drive the valve body)
Operate normally (the IDU
main control board is
damaged and the electronic
expansion valve body
cannot be driven)
Wired controller
Error code is not
displayed
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