Troubleshooting by Indication on the Remote Controller
161
∗
1: For thermistor/sensor characteristics, refer to P.369.
∗
2: The quality of the power transistor diode module can
be assessed by means of measurement of
resistance between terminals (Refer to P.354).
YES
Are
characteristics
of the thermistor on
the heat exchanger gas
side and the low
pressure sensor
normal?
(
∗
1)
NO
Replace the
thermistor/sensor
if any of its
characteristics
are abnormal.
Disconnect the
connection between the
compressor and the
inverter and turn ON the
power transistor check
mode setting using
“Setting Mode 2” on the
outside unit PCB.
Measure the output
voltage of the
inverter.
(
∗
2)
Note: Take
measurements
while frequency is
stable.
The
output
voltage
among three
phases is within ±5V
for TL power supply
and ±10V for Y1,
YL power
supply.
A
YES
NO
Replace the
inverter PCB.
Replace the
outside unit main
PCB.