Daikin FTKS20D3VMW, Service Manual, Page: 266 / 355

SiENBE12-713 Troubleshooting
Service Diagnosis 255
5.16 Discharge Pipe Temperature Control
Remote Control
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
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.)
"
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.277
Check No.06
Refer to P.279
Check No.11
Refer to P.282
Repl a ce a defective
thermi s tor.
Repl a ce the v a lve it s elf or
the coil.
Refer to the refriger a nt line
check proced u re.
Repl a ce the o u tdoor u nit
PCB.
(R4700)
Caution
Be su re to t u rn off power s witch b efore connect or di s connect connector,
or p a rt s d a m a ge m a y b e occ u rred.
Check No. 06
Check the thermi s tor s .
M a lf u nctioning
Di s ch a rge pipe thermi s tor
O u tdoor u nit he a t exch a nger thermi s tor
O u tdoor temper a t u re thermi s tor
Refriger a nt s hort a ge
Fo u r w a y v a lve m a lf u nctioning
W a ter mixed
S top v a lve defective
M a lf u nctioning
F u nctioning
F u nctioning
F u nctioning
Check No. 11
Check the refriger a nt line.
M a lf u nctioning
Check No. 04
Check the electronic exp a n s ion
v a lve.