Section 9 - Fault Finding
99
Installation and Maintenance
FAULT FINDING
9.1.12 Outdoor Unit, Return Thermistor (Tw_In)
9.1.13 No connection Outdoor PCB to Indoor PCB (H0)
Is the three-way wiring assembly from the Outdoor PCB
correctly connected to the Indoor Control Box?
Refer to Figure 41 on page 39.
Is the three-way wiring assembly from the Indoor
Control Box correctly connected to the Indoor PCB(as
shown in Figure 41)?
T1 connects to T1 X/HA connects to X/HA
T2 connects to T2 X/HB connects to X/HB
Replace the Indoor PCB. If the fault does not change,
then replace the Outdoor PCB.
Make sure that the three-way wiring
assembly from the Outdoor PCB is
correctly connected to the Indoor Control
Box.
Make sure that the three-way wiring
assembly from the Indoor Control Box is
correctly connected to the Indoor PCB.
Diagnose and repair all connections. Make
T1 connects to T1
T2 connects to T2
X/HA connects to X/HA
X/HB connects to X/HB
YES
YES
YES
NO
NO
NO
Is the Outdoor Unit, Return Thermistor
correctly connected to the Outdoor PCB?
Refer to Figure 67 on page 116.
Disconnect the Outdoor Unit Return Thermistor and
Replace the Outdoor PCB.
Make sure that the wiring assembly from
the Outdoor Unit Return Thermistor is
correctly connected to the Outdoor PCB.
Replace the Return Thermistor.
NO
NO
YES
YES
Figure 65. Indoor PCB (Section view)
3-Way Cable from Indoor Control Box
Note: 2-Way, 3-Way or 5-Way acceptable.
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