Sinclair SCV-750EB Service Manual page 104

5.14 dF Troubleshooting
Digital display output
Description
Normal defrost logic, resume after defrost, not fault.
5.15 P7 Troubleshooting
Digital display output
Description
For SCV-750EB and SCV-1400EB
High temperature protection of air side heat exchanger tube temperature sensor "T3a / T3b" in cooling mode. When the

tube temperature of air side heat exchanger is higher than 62°C, the system displays P7 protection and all units stop
running. When the tube temperature of air side heat exchanger returns drops below 55°C, P7 is removed and normal
operation resumes.
All units stop running.

Error code is displayed on main PCB and user interface.

For SCV-900EB and SCV-1800EB
High temperature protection of air side heat exchanger refrigerant outlet temperature sensor or air side heat exchanger

refrigerant total outlet temperature sensor in cooling mode. When the air side heat exchanger refrigerant outlet
temperature is higher than 62°C, the system displays P7 protection and all units stop running. When the air side heat
exchanger refrigerant outlet temperature returns drops below 55°C, P7 is removed and normal operation resumes.
 All units stop running.
Error code is displayed on main PCB and user interface.

Possible causes
For SCV-750EB and SCV-1400EB
Air side heat exchanger tube temperature sensor "T3a / T3b" not connected properly or has malfunctioned.

Fan motor wiring connection is wrong.

Poor condenser heat exchange.

Fan motor damaged.

Main PCB damaged.

For SCV-900EB and SCV-1800EB
Air side heat exchanger refrigerant outlet temperature sensor or air side heat exchanger refrigerant total outlet

temperature sensor not connected properly or has malfunctioned.
Fan motor wiring connection is wrong.

Poor condenser heat exchange.

Fan motor damaged.

 Main PCB damaged.
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