Outdoor Unit: Abnormal Discharge Pipe Temperature - Daikin R407C PLUS Service Manual

Troubleshooting
3.18 Outdoor Unit:
F3
Remote
Controller
Display
!
Supposed
!
Causes
!
!
!
Troubleshooting
174
Abnormal Discharge Pipe Temperature
Abnormal discharge pipe temperature
Defect of discharge pipe thermistor (R31T, R32T or R33T)
Defect of outdoor unit PC board
Discharge pipe thermistor wrong connection
Liquid injection solenoid valve wrong connection
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Discharge pipe
temperature is 135˚C
or higher.
NO
discharge pipe thermistor?
a wrong connection of the
injection solenoid valves Y3S,
Are the
characteristics
of the discharge pipe
thermistor normal?
(R31T, R32T or
R33T) (For the
characteristics
table.)
YES
YES
Is there
a wrong
connection of the
R31T (inverter side) to
YES
X16A, R32T (standard
side) to X17A and R33T
(standard side) to
X21A for 24~30
class.
NO
Is there
YES
Y6S and Y7S?
NO
NO
Troubleshooting R407C PLUS Series Heat Recovery System
Connect correctly and turn on again.
Out of gas, compression defect, etc.
Defect of the refrigerant system.
Replace the discharge pipe thermistor.
Replace outdoor unit PC board A1P.
(or A3P for 24~30 class)
Si33-105
(VF044)