Heating Overload; Abnormal Temperature Detection; Drain Trouble - Mitsubishi Heavy Industries FDCA Series Technical Manual

Error display :
6
Indoor unit
Red LED 1 time flash
Green LED Keeps flashing
Is the air filter clogged?
NO
Are the connections to
the indoor heat exchanger thermistor
OK?
NO
Repair
● Abnormal Temperature Detection
Compressor stop
Compressor
operation
56
Indoor unit heat exchanger temp. (˚C)
Error display :
7
Indoor unit
Red LED 1 time flash
Green LED Keeps flashing
Abnormal data check
in remote controller
Is there any
overflow?
Drain motor ON from
remote controller.
DM
operation
Is drain
piping unclogged?
Is the slop OK?
(1)
DM
e8

[Heating overload]

Red LED
Green LED
YES
Clean it.
Are the characteristics of
YES
the indoor heat exchanger thermistor
OK?
NO
Defective indoor unit heat
exchanger thermistor
Replacement
● Display condition
An abnormal stop occurs if this state is detected 5 times within 60 minutes of the
63
first detection, and if a temperature of 63ºC or higher is detected in the indoor heat
exchanger continuously for 6 minutes.
e9

[Drain trouble]

Red LED
Green LED
NO DC 12 V
at both terminals
of CNI?
YES
Float switch check
(1)
NO
YES
NO
Correction
YES
check
Outdoor unit
Stays OFF
Keeps flashing
Notes (1) Check if the overload state exists or not using the following check points.
( (
Is there a short circuit?
Is the indoor heat exchanger dirty or clogged?
Is the outdoor unit's fan control normal?
Is the indoor or outdoor air temperature too high?
(2) See the figure page 138 for indoor heat exchanger thermistor characteristics.
YES
Check the remote controller for abnormal data.
overload state exist?
Check the cooling system.
Outdoor unit
Stays OFF
Keeps flashing
NO
Replacement indoor
unit PCB
YES
AC 220/240 V
at both terminals
of CNR?
(1)
DM check of
motor wiring
139
- -
( (
YES
Does the heating
NO
NO
Replacement indoor
unit control PCB
YES
Note (1) DM: Drain motor
Adjust