Daikin R407C PLUS - Outdoor Unit: Malfunction of Discharge Pipe Thermistor (R3 T)

Troubleshooting Si33-105
176 Troubleshooting R407C PLUS Series Heat Recovery System
3.20 Outdoor Unit: Malfunction of Discharge Pipe Thermistor
(R3T)
Remote
Controller
Display
J3
Supposed
Causes
!
Defect of thermistor (R31T, R32T or R33T) for outdoor unit discharge pipe
!
Defect of outdoor unit PC board (A1P)
Troubleshooting
The alarm indicator is displayed when the fan is being used also.
Note: 16~20 HP class ··· R31T, R32T (A1P)
24~30 HP class ··· R31T, R32T (A1P), R33T (A3P)
(VF046)
Resistance
is normal when
measured after
disconnecting the thermistor
from the outdoor
unit PC board.
(3.5kΩ~400kΩ)
Replace outdoor unit PC board
A1P or A3P.
Connect the thermistor and turn
on again.
NO
NO
Replace the thermistor (R31T,
R32T or R33T)
YES
YES
Connector
is connected to X16A,
X17A or X21Aof outdoor unit
PC board
(A1P or A3P).
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.