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14. TROUBLESHOOTING <WALL TYPE>
14-1. 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 points before check
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 detected an overflow error?
• 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 speed changes.
• Does not high-temperature release operation control work in heating operation?
• Does not outside low-temperature operation control work in cooling operation?
• Is not defrost operation performed?
d) ON/OFF operation cannot be performed from remote controller.
• Is not during emergency operation?
• Is not the control operation performed from outside/remote side?
Did you return the cabling to the initial positions?
Are connecting cables of indoor unit and remote controller correct?
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 :
For cause of a trouble, power conditions or malfunction/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
remote controller and the signal line to shield cables.