Display Sequence Of Error, Inspection Display Lamp - Mitsubishi Heavy Industries FDCA Series Technical Manual

(b) Display sequence of error, inspection display lamp
1) One kind error
Display corresponding to the error is shown.
2) More than one errors.
Section
Error code of remote controller
Inspection LED (red) of indoor unit PCB
Inspection LED (red) of outdoor unit PCB
3) Timing of error detection
● Indoor unit side.
Error detail
Drain error (float switch motion)
Wrong connection between the indoor and
outdoor units.
Transmission error of remote controller
indoor unit
Transmission error between indoor/outdoor
units
The number of connected indoor units
exceeds the connection limit (when
multiple units are control by a single remote
controller).
Broken wire of indoor unit return air
thermistor
Broken wire of heat exchanger thermistor
● Outdoor unit side.
Error detail
Broken wire of outdoor air temperature
thermistor
Broken wire of heat exchanger thermister
Broken wire of discharge pipe thermistor
Broken wire of under-doom
thermistor
Notes (1) Values in ( ) show for the FDCA801, 1001 models.
(2) The under-doom thermistor is used in the FDCA801, 1001 models only.
• Displays the error of higher priority (When plural errors are persisting)
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• Displays the present errors.
(When a new error has occurred after the former error was reset.)
Error code
Normally, 30 seconds after the power is turned ON.
No communications even once with the outdoor unit.
" Wait "
After 1 or more communications of the indoor unit with the remote controller
following power on, transmission errors cause an interruption for 2 minutes.
After communications with the outdoor unit 1 or more times, communications
are abnormal continuously for 2 minutes.
Normally after the power is turned ON (during communications).
When an input temperature of –50°C or lower is measured by the return air
thermistor is measured for 5 seconds or longer within 60 minutes after the
first detection.
When an input temperature of –50°C or lower is measured by the heat
exchanger thermistor is measured for 5 seconds or longer within 60 minutes
after the first detection.
Error code
When a thermistor input temperature of –30°C or lower is measured for 5
seconds or longer within 60 minutes (3 times within 60 minutes) after the 1st
detection between 2 minutes and 2 minutes 20 seconds after compressor
operation starts.
When a thermistor input temperature of –30°C or lower is measured for 5
seconds or longer within 60 minutes (3 times within 60 minutes) after the 1st
detection between 2 minutes and 2 minutes 20 seconds after compressor
operation starts.
When a thermistor input temperature of –10°C or lower is measured for 5
seconds or longer within 60 minutes (3 times within 60 minutes) after the 1st
detection between 10 minutes and 10 minutes 20 seconds (between 2 minutes
and 2 minutes 20 seconds) after compressor operation starts.
When the under-dome thermistor input temperature of –10°C is measured for
5 seconds or longer 3 times within 60 minutes after the 1st detection between
10 minutes and 10 minutes 20 seconds after compressor operation starts.
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Display section
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Timing of error detection
Timing of error detection