Specifications

56
➂
Trouble shooting
Problem Check point Corrective measure
Remove the connector from the controller board and connect diagnostic
LEDs.
Pulse signal will be sent out for 10 seconds as soon as the main switch is
turn on. If there is LED with lights on or lights off, it means the operation
circuit is abnormal.
Motor will idle and make ticking noise when motor is operated while the linear
expansion valve is locked.
This ticking sound is the sign of the abnormality.
Measure the resistance between the each coil (red-white, red-orange,
brown-yellow, brown-blue) using a tester. It is normal if the resistance
is in the range of 150'±10%.

1 Check improperly connected connector terminals and the wire colors.
2 Remove the connector on the controller board side and check electrical
conductance
Operation circuit
failure of the micro
processor.
Exchange the linear
expansion valve.
Exchange the indoor
controller board at drive
circuit failure.
Exchange the linear
expansion vale.
Disconnect the connector
at the controller board,
then check the continuity.
Wrong connection of
the connector or
contact failure.
Short or breakage of
the motor coil of the
linear expansion valve.
Linear expansion
valve mechanism is
locked.
6
5
4
3
2
1
1k" LED
OCT03-E-2.qxp 04.3.26 1:48 PM Page 56