Sinclair SCV-EB Series Service Manual page 45

5.2 bA Troubleshooting
5.2.1 Digital display output
5.2.2 Description
 Outdoor temperature exceeds the operation temperature range
 Heat pump stops running.
 Error code is displayed on the refrigerant system PCB digital tube and user interface.
5.2.3 Procedure
The setting value of T4MAX or T4MIN is
out of operation range
The location of ambient temperature
sensor(T4) is near the place temperature
too low or too high.
Temperature drift of ambient
temperature sensor(T4) is too big
Replace hydro system PCB
Notes:
1. Ambient temperature sensor(T4) connection is port CN6 on the refrigerant system PCB
bA
No
No
No
Adjust the setting value according to the
Yes
operation range
Place the ambient temperature
sensor(T4) in the normal using
Yes
environment. Do not
radiation from a high-temperature/low-
temperature heat source.
Change the ambient temperature
Yes
sensor(T4)
exposed to direct
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