Mitsubishi Heavy Industries FDT90VNPWVH Service Manual page 50

(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)
control
Red LED on indoor unit
• 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 control
communication circuit error
Communication error during
operation
Indoor
Excessive number of
connected indoor units by
controlling with one remote
control
Return air temperature sensor
anomaly
Indoor heat exchanger
temperature sensor anomaly
Outdoor air temperature
sensor anomaly
Outdoor
Outdoor heat exchanger
temperature sensor anomaly
Discharge pipe temperature
sensor anomaly
Category of display
Error code
Whenever float switch is activated after 30 seconds had past
since power ON.
" No communication between indoor and outdoor units is
"
WAIT
established at initial operation.
Communication between indoor unit and remote control
is interrupted for more than 2 minutes continuously after
initial communication was established.
Communication between indoor and outdoor units is
interrupted for more than 2 minutes continuously after
initial communication was established.
Whenever excessively connected indoor units is detected
after power ON.
-50°C or lower is detected for 5 seconds continuously
within 60 minutes after initial detection of this anomalous
temperature.
-50°C or lower is detected for 5 seconds continuously
within 60 minutes after initial detection of this anomalous
temperature.
Or 70°C or higher is detected for 5 seconds continuously.
-55°C or lower is detected for 5 seconds continuously
3 times within 40 minutes after initial detection of this
anomalous sensor.
Or -55°C or higher is detected for 5 seconds continuously
within 20 seconds after power ON.
-55°C or lower is detected for 5 seconds continuously
3 times within 40 minutes after initial detection of this
anomalous sensor.
Or -55°C or lower is detected for 5 seconds continuously
within 20 seconds after power ON.
-25°C or lower is detected for 5 seconds continuously
3 times within 40 minutes after initial detection of this
anomalous sensor.
49
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'19 • PAC-SM-334
Error detecting timing