Daikin AT12BV1LS Pocket Manual page 71

Troubleshooting
5.2.22 Discharge Pipe Temperature Control
Remote
Controller
Display
Outdoor
Unit LED
Display
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
70
F3
A 1 2
5 4
The discharge pipe temperature control (stop, frequency
drooping, etc.) is checked with the temperature being
detected by the discharge pipe thermistor.
If a stop takes place 6 times straight due to abnormal
discharge pipe temperature, the system will be shut
down.
If the temperature being detected by the discharge
pipe thermistor rises above 120°C, the compressor
will stop. (The error is cleared when the temperature
has dropped below 107°C.)
Stop temperatures (in the case of 3MXS52BVMB)
(1) 110°C when the frequency rises above 45 Hz or
drops below 40 Hz.
(2) 102°C when the frequency rises from 30 Hz to 45 Hz
or drops from 40 Hz to 25 Hz.
(3) 98°C when the frequency rises just up to 30 Hz or
drops below 25 Hz.
The error counter will reset itself if this or any other
error does not occur during the following 60-minute
compressor running time (total time).
Refrigerant shortage
Four way valve malfunctioning
Discharge pipe thermistor defective
(heat exchanger or outdoor temperature thermistor
defective)
Outdoor unit PCB defective
Water mixed in the local piping
Electronic expansion valve defective
Stop valve defective
3 4
1 4 1
Si10-417
Service Diagnosis