Daikin 3MKS50DVM, Service Manual

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Si12-619A Troubleshooting
Service Diagnosis 233
5.17 Discharge Pipe Temperature Control
Remote
Controller
Display
F3
Outdoor Unit LED
Display A 5 1 4 2 1 3 4 4 1
Method of
Malfunction
Detection The discharge pipe temperature control (stop, frequency drooping, etc.) is checked with the
temperature being detected by the discharge pipe thermistor.
Malfunction
Decision
Conditions 2YC45, 2YC63
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.)
2YC36
If the temperature being detected by the discharge pipe thermistor rises above 110°C, the
compressor will stop. (The error is cleared when the temperature has dropped below 95°C.)
2YC32
The temperature at which the compressor halts varies according to the frequency.
(1) 110°C when the frequency is above 45 Hz on ascending or above 40 Hz on descending.
(2) 102°C when the frequency is between 30 Hz and 45 Hz on ascending or between 40Hz and
25Hz on descending.
(3) 98°C when the frequency is below 30 Hz on ascending or below 25 Hz on descending.
„
If the compressor stops 6 times straight due to abnormal discharge pipe temperature, the
system will be shut down.
„
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).
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.261
Check No.06
Refer to P.263
Check No.11
Refer to P.266
Replace a defective
thermistor.
Replace the valve itself or
the coil.
Refer to the refrigerant line
check procedure.
Replace the outdoor unit
PCB.
(R4700)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Check No. 06
Check the thermistors.
Malfunctioning
z
Discharge pipe thermistor
z
Outdoor unit heat exchanger thermistor
z
Outdoor temperature thermistor
z
Refrigerant shortage
z
Four way valve malfunctioning
z
Water mixed
z
Stop valve defective
Malfunctioning
Functioning
Functioning
Functioning
C heck No. 11
Check the refrigerant line.
Malfunctioning
C heck No. 04
Check the electronic expansion
valve.