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6. TROUBLESHOOTING
6-1. Summary of Troubleshooting
<Wired controller type>
1. Before troubleshooting
1) Required tools/instruments
• + and – screwdrivers, spanners, long-nose pliers, nippers, push pins for reset switch
• Tester, thermometer, pressure gauge, etc.
2) Confirmation points before check
a) The following operations are normal.
1. Compressor does not operate.
• Is the air conditioner being controlled by the 3-minute protective function?
• Is it in standby status though the room temperature has reached the setup temperature?
• Is it being operated in timer mode or fan mode?
• Is the remote controller set in “heating” under the high outside air temperature?
2. Indoor fan does not operate.
• Is the air conditioner being controlled by the cool air discharge preventive function in “heating”?
3. Indoor fan does not operate or fan speed changes.
• Is the air conditioner being controlled by high-temperature release function in “heating”?
• Is the remote controller set in “cooling” under the low outside air temperature?
• Is the air conditioner being operated in defrost operation?
4. ON/OFF operation cannot be performed from remote controller.
• Is the air conditioner being operated by the central control system?
• Is an automatic address being set up?
(When the power is turned on at the first time or when indoor unit address setting is changed, the
operation cannot be performed for maximum approx. 5 minutes after power-ON.)
• Is a test run of the air conditioner being carried out?
b) Did you return the cabling to the initial positions?
c) Are connecting wires of indoor unit and remote controller correct?
2. Troubleshooting procedure
When a trouble occurred, check the parts along with the following procedure.
NOTE :
For cause of a trouble except the items to be checked, miss diagnosis of microcomputer due to outer noise or
power conditions is considered. If there is any noise source, change the wires of the remote controller to shield
wires.
Trouble
Confirmation of check code di
s
play
Check trouble po
s
ition and part
s
.
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