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8. TROUBLESHOOTING
8-1. Summary of Troubleshooting
<Wired remote 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 an overflow trouble detected on the indoor unit?
• 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. Outdoor fan does not operate or fan speed changes.
• Does high-temperature release operation control work in heating operation?
• Does outside low-temperature operation control work in cooling operation?
• Is defrost operation performed?
4. ON/OFF operation cannot be performed from remote controller.
• Is it 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 being carried out a test run by operation of the outdoor unit?
5. LED for the indoor and outdoor communication does not flash.
∗
service switches (SW01 or SW02) on the outdoor unit allow
• Does standby power saving operation control work?
(LED does flash, when the inside and outside communication is being stopped during the standby
power saving control. Operating service switches (SW01 or SW02) on the outdoor unit allow to
restart the communication.)
b) Did you return the wiring to the initial positions?
c) Are connecting wiring 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
on wired remote controller
Check trouble po
s
ition and part
s
.
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