Troubleshooting Procedure; Troubleshooting At The Indoor Unit - Mitsubishi Electric FDF71VNXVD Technical Manual

■ Error log and reset
Error indicator
Remote controller display
Red LED on indoor control PCB
Red LED on outdoor control PCB
■ Resetting the error log
• Resetting the memorized error log in the remote controller
Holding down "CHECK" button, press "TIMER" button to reset the error log memorized in the remote controller.
• Resetting the memorized error log
The remote controller transmits error log erase command to the indoor unit when "VENTI" button is pressed while
holding down "CHECK" button.
Receiving the command, the indoor unit erase the log and answer the status of no error.
(2) Troubleshooting procedure
When any trouble has occurred, inspect as follows. Details of respective inspection method will be described on later pages.
Confirmation
of power
Trouble supply
(Indoor/
outdoor unit)
(3) Troubleshooting at the indoor unit
With the troubleshooting, find out any defective part by checking the voltage (AC, DC), resistance, etc. at respective connectors
at around the indoor PCB, according to the inspection display or operation status of unit (the compressor does not run, fan does
not run, the 4-way valve does not switch, etc.), and replace or repair in the unit of following part.
(a) Replacement part related to indoor PCB's
Control PCB, power supply PCB, temperature thermistor (return air, indoor heat exchanger), remote controller switch,
limit switch, transformer and fuse
Note (1) With regard to parts of high voltage circuits and refrigeration cycle, judge it according to ordinary inspection methods.
Memorized error log
• Higher priority error is memorized.
• Not memorized.
• Memorizes a mode of higher priority.
Confirmation of
remote controller and
LEDs on the PCB Check of the anomalous
of indoor unit and
outdoor unit (Indoor/
outdoor unit, remote
controller)
123
-
• Stop the unit by pressing the ON/OFF
switch of remote controller.
• If the unit has recovered from anomaly, it
can be operated.
operation data on the
remote controller
-
'11 • PAC-T-160
Reset
Replacement/
Inspection repair of
of the unit/ faulty part,
controller test run,
adjustment