Daikin AT12BV1LS Pocket Manual page 76

Si10-417
5.2.25 High Pressure Control in Cooling
Remote
Controller
Display
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
Service Diagnosis
F6
High-pressure control (stop, frequency drop, etc.) is
activated in the cooling mode if the temperature being
sensed by the heat exchanger thermistor exceeds the
limit.
Activated when the temperature being sensed by the
heat exchanger thermistor rises above 54°C.
(Deactivated when the said temperature drops below
52°C.)
The installation space is not large enough.
Faulty outdoor unit fan
Faulty electronic expansion valve
Faulty outdoor unit heat exchanger thermistor
Faulty outdoor unit PCB
Faulty stop valve
Dirty heat exchanger
Troubleshooting
75