Discharge Pipe Temperature Control - Daikin Super Multi NX C-Series Service Manual

Troubleshooting

5.16 Discharge Pipe Temperature Control

F3
Remote
Controller
Display
Outdoor Unit LED
A
Display
Method of The discharge pipe temperature control (stop, frequency drooping, etc.) is checked with the
Malfunction temperature being detected by the discharge pipe thermistor.
Detection
" If a stop takes place 6 times straight due to abnormal discharge pipe temperature, the
Malfunction
Decision
" If the temperature being detected by the discharge pipe thermistor rises above 120°C, the
Conditions
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
" Refrigerant shortage
Supposed
" Four way valve malfunctioning
Causes
" Discharge pipe thermistor defective
" Outdoor unit PCB defective
" Water mixed in the local piping
" Electronic expansion valve defective
" Stop valve defective
Troubleshooting
Check No.4
Refer to P.205
Check No.6
Refer to P.207
Check No.11
Refer to P.210
188
5 1 4 2 1 3 4 4
system will be shut down.
compressor will stop. (The error is cleared when the temperature has dropped below
107°C.)
60-minute compressor running time (total time).
(heat exchanger or outdoor temperature thermistor defective)
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Check No. 6
Check the thermistors.
Functioning
Check No. 4
Check the electronic expansion
valve.
Functioning
Check No. 11
Check the refrigerant line.
Functioning
1
Malfunctioning
Discharge pipe thermistor
Outdoor unit heat exchanger thermistor
Outdoor temperature thermistor
Malfunctioning
Malfunctioning
Refrigerant shortage
Four way valve malfunctioning
Water mixed
Stop valve defective
SiE12-411
Replace a defective
thermistor.
Replace the valve itself or
the coil.
Refer to the refrigerant line
check procedure.
Replace the outdoor unit
PCB.
(R2846)
Service Diagnosis