Sinclair SCV-1400EB, Service Manual

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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.