22 English
10. TEST OPERATION
Make sure the service covers are closed on the indoor and outdoor units.
Refer to the installation manual of the outdoor unit.
• The operation lamp of the remote controller will flash when an malfunction occurs. Check the malfunction
code on the liquid crystal display to identify the point of trouble. An explanation of malfunction codes and
the corresponding trouble is provided in the installation manual of the outdoor unit or the service manual.
If any of the items in Table 4 are displayed, there may be a problem with the wiring or power, so check the
wiring again.
Table 4
• In order to protect the indoor unit, instruct the customer not to operate the air conditioner until the interior
work is completed if the interior work has not been finished at the end of the test run.
(If the air conditioner is operated, substances discharged from the paint, adhesive, etc. can contaminate the
indoor unit, and they may cause splashing or leakage of water.)
• After the test run is finished, check the items listed in “b. Items to be checked at time of delivery”.
Remote controller display Content
“ ” is lit up
• There is a short circuit at the FORCED OFF terminals (T1, T2).
“U4” is lit up
“UH” is lit up
• The power on the outdoor unit is off.
• The outdoor unit has not been wired for power supply.
• Incorrect wiring for the transmission wiring and/or FORCED
OFF wiring.
• The branch wiring is cut.
No display
• The power on the indoor unit is off.
• The indoor unit has not been wired for power supply.
• Incorrect wiring for the remote controller wiring, the
transmission wiring, and/or the FORCED OFF wiring.
• The remote controller wiring is cut.
4PEN494115-1A.book Page 22 Tuesday, October 3, 2017 10:51 AM
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