Sinclair SCV-750EB Service Manual page 80

Ed indicates discharge pipe temperature sensors Tp1 and Tp2A error at the same time

1EE indicates EVI plate heat exchanger refrigerant temperature sensor T6A error
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2EE indicates EVI plate heat exchanger refrigerant temperature sensor T6B error

EF indicates unit water return temperature sensor error

EP indicates discharge temperature sensor failure error

EU indicates air side heat exchanger refrigerant total outlet temperature sensor Tz error.

Fb indicates pressure sensor error.

Fd indicates suction temperature sensor Th error.

All stop running.

Error code is displayed on main PCB and user interface.
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Possible causes
 Sensor not connected properly or has malfunctioned.
Damaged main PCB.

Procedure
For SCV-750EB and SCV-1400EB
E3 / E4 / E5 / E6 /E7 / Eb / Ed /EE/ EF / EP
Sensor connection on main PCB or slave
Sensor has short-circuited or failed
If the fault is EP, it is also necessary to
confirm whether the exhaust sensor on
the top of the compressor has fallen
Replace main PCB or expansion PCB
Notes:
1. Most sensors are connected to ports CN4 (E4), CN37 (1E5), CN16 (2E5), CN30 (E7), CN45 (2Eb), CN4 and CN38 (Ed), CN8 (EE), CN4 (EF), CN4 and CN38 (EP),
CN4 (EU), CN41 (Fb), CN4 (Fd) on the main PCB (labeled 29, 22, 24, 23, 21, 25, 28, 19 in Part 4, 2.2.1 Main PCB component), A few sensors are connected to ports
CN101 (E3), CN103 (E6), CN105 (1Eb) on the slave PCB (labeled 14,15,13 in Part 4, 2.7 Slave PCB component).
2. Measure sensor resistance. If the resistance is too low, the sensor has short-circuited. If the resistance is not consistent with the sensor's resistance
characteristics table, the sensor has failed. Refer to Part 4, 6.1 "Temperature Sensor Resistance Characteristics".
78
/ EU / Fb / Fd
PCB is loose
No
2
No
No
Yes
Ensure the sensor is connected properly
Yes
Replace the sensor
Yes Confirm whether the exhaust sensor on
the top of the compressor has fallen