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10. TROUBLESHOOTING
10-1. Summary of Troubleshooting
10-1-1. Before troubleshooting
(1) Required tools/instruments
• e and d screwdrivers, spanners, radio
cutting pliers, nippers, etc.
• Tester, thermometer, pressure gauge, etc.
(2) Confirmation points before check
1 The following operations are normal.
a) Compressor does not operate.
• Is not 3-minutes delay (3 minutes after
compressor OFF)?
• Does not thermostat turn off?
• Does not timer operate during fan
operation?
• Is not outside high-temperature operation
controlled in heating operation?
b) Indoor fan does not rotate.
• Does not cool air discharge preventive
control work in heating operation?
c) Outdoor fan does not rotate or air volume
changes.
• Does not high-temperature release opera-
tion control work in heating operation?
• Does not outside low-temperature opera-
tion control work in cooling operation?
• Is not defrost operation performed?
d) ON/OFF operation cannot be performed from
remote control.
• Is not forced operation performed?
• Is not the control operation performed from
outside/remote side?
2 Did you return the cabling to the initial
positions?
3 Are connecting cables between indoor unit and
receiving unit correct?
Trouble → Confirmation of check code by service mode
→ Check defective position and parts.
10-1-2. Troubleshooting procedure
When a trouble occurred, check the parts along with
the following procedure.
NOTE :
For cause of a trouble, power conditions or malfunc-
tion/erroneous diagnosis of microcomputer due to
outer noise is considered except the items to be
checked. If there is any noise source, change the
cables of the signal line to shield cables.
10-1-3. Outline of Judgment
A primary judgment to detect cause of error exists on
the indoor unit or outdoor unit is performed in the
following procedure.
<Judgment by flashing display on the indoor
unit display part>
The indoor unit monitors operating status of the air
conditioner, and if a protective circuit works, contents
of the self-diagnosis are displayed with a block
restricted to the following cases on the indoor unit
display part (Sensor).
Remote
Block display Contents of self-diagnosis Check code
control code
–– Operation lamp display flashes. (1Hz) Power failure (In power ON) ––
00 Operation lamp display flashes. (5Hz) Indoor P.C. board 0b to 0F, 11, 12, b5, b6
01 Operation/timer lamp displays flash. (5Hz) Inter-unit cables/transmission system 04
02 Operation/defrost lamp displays flash. (5Hz) Outdoor P.C. board 14 to 19, 1A, 1C
03 Operation/timer/defrost lamp displays flash. (5Hz) Cycle system, etc. 1d, 1E, 1F, 21
–– –– –– 1b, 8b
Table 10-1-1