Sinclair SF-250F3, Service Manual, Page: 40 / 44

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If the unit or its parts need(s) to be removed, make sure that:
Only a professional person can disassemble the unit.
The system with antifreeze must not be discarded; otherwise, it will cause pollution. It should be collected and
then be disposed off properly.
As a special waste, electronic components must be handled by professional persons together with polyurethane
foam, polyurethane and sound absorbing sponge.
12.6 Troubleshooting
The system maintenance must be carried out by qualified maintenance personnel.
Error Measures
If a safety device, such as a fuse, circuit breaker or a leakage
circuit breaker is triggered frequently or the ON/OFF switch is
not working properly.
Turn off the main power switch.
The operating switch is not functioning normally. Turn off the power supply.
If a centralized controller is used, the unit number is displayed
on the user interface, and the operating indicator is flickering,
and an error code is shown on the screen as well.
Notify the installation personnel and report the
error code.
Except as noted above, if the above faults are not typical and the unit still fails, follow the steps below:
Error Measures
If the system does not run at all.
Check whether there is a power failure. Wait for the power supply
to be restored. If a power failure occurs when the unit is still
running, the system will restart automatically once the power is
restored.
The system is running but there is
insufficient cooling or heating.
Check whether the air outlet is blocked by any obstacles.
Remove the obstacles.
Check whether the filter is blocked.
Check the temperature setting.
Check the fan speed settings on the user interface.
Check whether the doors and windows are open.
Close the doors and windows to shut out wind from the external
environment.
Check whether there are too many people in the room when the
cooling mode is in operation.
Check whether the heat source of the room is too high.
Check whether there is direct sunlight into the room. Use curtains
or blinds.
Check whether the angle of air flow is appropriate.