8. TROUBLESHOOTING
8-1. Summary of Troubleshooting
<Wired remote controller type>
1. Before troubleshooting
1) Required tools/instruments
• ⊕ and ⊖ screwdrivers, spanners, radio cutting pliers, nippers, push pins for reset switch
• Tester, thermometer, pressure gauge, etc.
2) Confirmation the following points before check
a) The following operations are normal.
1. Compressor does not operate.
• When 3-minutes delay (3 minutes after compressor OFF)
• When the outdoor unit is in standby mode due to the room temperature reached the setup
temperature
• When the timer is operating
• When indoor fan only operation mode
• When an overflow error is detected in the indoor unit
• When outside high-temperature operation controlled is in heating operation
• When Thermo-OFF setting by Application Control Kit (TCB-PCOS1E2)
2. Indoor fan does not rotate.
• When cool air discharge prevention control is working in heating operation
3. Outdoor fan does not rotate or air volume changes.
• When high-temperature release operation control is working in heating operation
• When outside low-temperature operation control is working in cooling operation
• When defrost operation is being performed
4. ON/OFF operation cannot be performed from remote controller.
• When the control operation is being performed from outside/remote side
• When automatic address is being set up
(When the power is turned on at the first time or when indoor unit address setting is changed, the
operation will be performed after power-ON in 5 minutes or before.)
• When the test run is being performed by operation of the outdoor controller
b) Did you return the cabling to the initial positions?
c) Are indoor unit and remote controller connected correctly?
2. Troubleshooting procedure
When a trouble occurred, check the parts along with the following procedure.
Trouble Confirmation of check code display Check defective position and parts.
→ →
NOTE
Microcomputer misdiagnosis may also be caused by power condition problem and outer noise other than the
checked items. If there is any noise source, change the cables of the remote controller to shield cables.
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