Service manual

SiUS28-902_a Troubleshooting by Indication on the Remote Controller
Troubleshooting 110
Troubleshooting
(Orange) 1
Measuring points
1 - 6
2 - 6
3 - 6
4 - 6
(Red) 2
(Yellow) 3
(Black) 4
5
(Gray) 6
*Make measurement of resistance between the connector pins, and then make sure the resistance falls in
the range of 40 to 50
kΩ.
YES
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector, or parts could be damaged.
Return to normal?
Turn power supply off, and
turn power supply on again.
Electronic
expansion valve is
connected to X21A and
X22A of outdoor unit
P. C . B .
(A1P).
Normal
when coil
check (*1) of the moving
part of the electronic
expansion valve is
checked.
The connecting
cable is short-circuited or
disconnected.
Replace the connecting cable.
Replace the outdoor unit P.C.B.
(A1P).
NO
NO
NO
NO
Replace the moving part of the
electronic expansion valve.
External factor other than
malfunction (for example, noise
etc.).
After connecting, turn the power
off and then back on again.
YES
YES
YES