Sinclair SCV-750EB Service Manual page 106

For SCV-900EB and SCV-1800EB
Air side heat exchanger refrigerant outlet
temperature sensor or air side heat
exchanger refrigerant total outlet
temperature sensor is loose
Fan motor wiring connection is wrong
Air side heat exchanger refrigerant outlet
temperature sensor or air side heat
exchanger refrigerant total outlet
temperature sensor has short-circuited or
The air side heat exchanger heat exchange
The fan or fan motor is blocked or damaged
Replace outdoor main PCB
Notes:
4. Air side heat exchanger refrigerant outlet temperature sensor and air side heat exchanger refrigerant total outlet temperature sensor connection port is
CN1 on the main PCB (labeled 29 in Part 4, 2.2.1 Main PCB component)
5. 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".
6. Check air side heat exchanger, fan(s) and air outlets for dirt/blockages.
104
P7
1
No
No
failed 2
No
is poor 3
No
No
Ensure the temperature sensor is
Yes
connected properly
Ensure fan motor wiring is connected
Yes
Yes
Replace the temperature sensor
Yes
Inspect the system and fix the error
Yes
Inspect the system and fix the error
properly