Sanyo Big PACi 18 Series Technical Data & Service Manual page 229

(5) [Alarms "F04," "F06," "F07," "F08," "F12"]
Start of defect diagnosis
connectors of the sensor
020 (C2), 021 (C1), 022 (TS),
023 (TO) and 024 (TD) connected
correctly to the outdoor unit
control PCB ?
Yes
Are the characteristics
of resistance values of the
sensors C2, C1, TS, TO and TD
sensors normal? *
5
Yes
Check the outdoor unit control PCB.
Replace if PCB has failed.
Are the
No
No
* Refer to "5-5. Table of Thermistor Characteristics."
Sensor trouble
Correct the connections.
Replace the sensors C2, C1, TS, TO and TD.
5-12