Daikin RTSQ20PY1 Service Manual page 286

Troubleshooting by Indication on the Remote Controller
Troubleshooting
*1. List of Inverter PCBs
275
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Turn OFF the power supply
once, and then check the
compressor lead wires.
Do the lead wires have any
disconnection, broken wire,
short circuit, or ground
fault?
NO
Turn ON the power supply
again.
Does the power
supply normally come
back ON?
NO
While in monitor mode,
check the unit concerned.
CHECK 4 *
Check if the
power transistor is
normal.
YES
CHECK 4 *
Check if the
power transistor of
the fan driver is
normal.
YES
* CHECK 4 : Referring to the information on P.341.
Model
Compressor inverter PCB
RTSQ 8, 10, 12P
Fan inverter PCB
Compressor inverter PCB
RTSQ 14, 16P
Fan inverter PCB
BTSQ20P Compressor inverter PCB
YES
YES
NO
Check if insulation
resistance of the
compressor is 100kΩ
and above.
YES
NO
Name Electric symbol
SiBE31-801_C
Replace the lead wires.
It is supposed that the malfunction
results from external causes other
than failures (e.g. exogenous
noises or thunder).
NO
Replace the compressor and
compressor inverter PCB (A4P) at
the same time.
Replace the inverter PCB (A4P).
Replace the compressor inverter
PCB (A4P) and fan inverter PCB
(A5P).
Replace the inverter PCB (A4P).
A4P
A5P
A4P
A5P, A8P
A3P
Troubleshooting