Mitsubishi Heavy Industries FDT71VNXVD Service Manual page 28

(iv) Display sequence of error codes or inspection indicator lamps
Occurrence of one kind of error
Displays are shown respectively according to errors.
Occurrence of plural kinds of error
Section
Error code on remote
• Displays the error of higher priority (When plural errors are persisting)
controller
Red LED on indoor
control PCB
Red LED on outdoor
• Displays the present errors. (When a new error has occurred after the former error was reset.)
control PCB
Error detecting timing
Section Error description
Drain trouble (Float switch
activated)
Communication error at
initial operation
Remote controller
communication circuit error
Communication error during
operation
Indoor
Excessive number of
connected indoor units by
controlling with one remote
controller
Return air temperature
thermistor anomaly
Indoor heat exchanger
temperature thermistor
anomaly
Outdoor air temperature
thermistor anomaly
Outdoor heat exchanger
temperature thermistor
anomaly
Discharge pipe temperature
Outdoor
thermistor anomaly
Suction pipe temperature
thermistor anomaly
Low pressure sensor anomaly
Underneath temperature
thermistor anomaly
N
Category of display
Error code
Whenever float switch is activated after 30 second had past since
power ON.
" No communication between indoor and outdoor units is
WAIT
"
established at initial operation.
Communication between indoor unit and remote controller is
interrupted for mote than 2 minutes continuously after initial
communication was established.
Communication between indoor and outdoor units is interrupted
for mote than 2 minutes continuously after initial communication
was established.
Whenever excessively connected indoor units is detected after
power ON.
-50 (-45)°C or lower is detected for 5 (15) seconds continuously
within 60 minutes after initial detection of this anomalous
temperature.
-50 (-28)°C or lower is detected for 5 (15) seconds continuously
within 60 minutes after initial detection of this anomalous
temperature.
Or 70°C or higher is detected for 5 seconds continuously.
-45°C or lower is detected for 5 seconds continuously 3 times
within 40 minutes after initial detection of this anomalous
temperature.
Or -45°C or higher is detected for 5 seconds continuously within
20 seconds after compressor ON.
-50°C or lower is detected for 5 seconds continuously 3 times
within 40 minutes after initial detection of this anomalous
temperature.
Or -50°C or lower is detected for 5 seconds continuously within
20 seconds after compressor ON.
-10°C or lower is detected for 5 seconds continuously 3 times
within 40 minutes after initial detection of this anomalous
temperature.
-50°C or lower is detected for 5 seconds continuously 3 times
within 40 minutes after initial detection of this anomalous
temperature.
0V or lower or 3.49V or higher is detected for 5 seconds
continuously 3 times within 40 minutes after initial detection of
this anomalous pressure.
-50°C or lower is detected for 5 seconds continuously 3 times
within 40 minutes after initial detection of this anomalous
temperature.
- -
28
'10 • PAC-SM-137A
Error detecting timing