Daikin FTXS09HVJU, Service Manual, Page: 131 / 274

SiUS04-904 Troubleshooting
120 Service Diagnosis
4.12.2 15/18/24 Class
Remote
Controller
Display
F3
Method of
Malfunction
Detection
The discharge pipe temperature control (stop, frequency dropping, etc.) is checked with the
temperature being detected by the discharge pipe thermistor.
Malfunction
Decision
Conditions

If a stop takes place 6 times successively due to abnormal discharge pipe temperature, the
system is shut down.

If the temperature being detected by the discharge pipe thermistor rises above 248°F (120°C),
the compressor stops. (The error is cleared when the temperature has dropped below
225°F(107°C).
Stop temperatures (variable by models)
(1) 230°F (110°C): above 45Hz (rising), above 40Hz (dropping)
(2) 216°F (102°C): 30~45Hz (rising), 25~40Hz (dropping)
(3) 208°F (97.8°C) : below 30Hz (rising), below 25Hz (dropping)

The error counter is reset if this or any other error does not occur during the following 60-minute
compressor running time (total time).
Supposed
Causes

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
Troubleshooting
Check No.04
Refer to P.144
Check No.06
Refer to P.146
Check No.11
Refer to P.156
(R7141)
Caution
Be s u re to t u rn off the po w er s w itch b efore connecting or disconnecting
the connector, or parts damage may occ u r.
Malf u nctioning
Discharge pipe thermistor
O u tdoor u nit heat exchanger thermistor
O u tdoor temperat u re thermistor
Refrigerant shortage
Fo u r- w ay v al v e malf u nctioning
W ater mixed
Stop v al v e defecti v e
F u nctioning
F u nctioning
F u nctioning
Malf u nctioning
Malf u nctioning
Check No. 06
Check the thermistors.
Check No. 11
Check the refrigerant line.
Check No. 04
Check the electronic
expansion v al v e.
Replace the defecti v e
thermistor.
Replace the v al v e itself or
the coil.
Refer to the refrigerant line
check proced
u re.
Replace the o u tdoor u nit
PCB.