Abnormality Of Indoor Controller Board; Abnormality Of Remote Controller Control Board; Forced Compressor Stop - Mitsubishi PLH-3AAK Technical & Service Manual

Error Code Meaning of error code and detection method

Abnormality of indoor controller board

Abnormal if data cannot be normally read
Fb
from the nonvolatile memory of the indoor
controller board.
Abnormality of remote controller con-
trol board
1 Abnormal if data cannot be normally
read from the nonvolatile memory of the
E1
remote controller control board.
or
(Error code: E1)
E2
2 Abnormal if the clock function of remote
controller cannot be normally operated.
(Error code: E2)

Forced compressor stop

(due to water leakage abnormality)
1 When the intake temperature subtracted
with liquid pipe temperature is less than
-10:, drain sensor is detected whether
it is soaked in the water or not at the interval
of 90 seconds. (Drain pump will start operating
when the drain sensor is detected to be
soaked in the water.)
2 The unit has a water leakage abnormality
when the following conditions, a and b, are
satisfied while the above-mentioned detection
is performed.
a) The drain sensor is detected to be
soaked in the water 10 times in a row.
PA
b) The intake temperature subtracted with
(2502)
liquid pipe temperature is detected to be
(2500)
less than -10: for a total of 30 minutes.
(When the drain sensor is detected to
be NOT soaked in the water, the detection
record of a and b will be cleared.)
3 The drain sensor detection is performed
in operations other than cooling. (When
the unit stops operating, during heating
or fan operation, when the unit stops
because of some abnormality)
*Once the water leakage abnormality is
detected, abnormality state will not be
released until the main power is reset.
Cause
1 Defective indoor controller
board.
1 Defective remote controller.
1) Drain pump trouble
2) Drain defective
· Drain pump clogging
· Drain pipe clogging
3) Open circuit of drain sensor
side heater
4) Contact failure of drain sensor
connector
5) Dew condensation on drain
sensor
· Drain water descends along
lead wire.
· Drain water waving due to filter
clogging.
6) Extension piping connection
difference at twin, triple,
quadruple system.
7) Mis-wiring of indoor/ outdoor
connecting at twin, triple,
quadruple system.
8) Room temperature thermistor /
liquid pipe temperature thermis-
tor detection is defective.
40
Countermeasure
1 Replace indoor controller board.
1 Replace remote controller.
Check the drain pump.
Performance
Please confirm whether water can be drained.
Confirm the resistance of the drain sensor side
heater.
Check the connector contact failure.
1 Check the drain sensor leadwire mounted.
2 Check the filter clogging
Check the piping connection.
Check the indoor/ outdoor connecting wires.
Check the room temperature display of remote
controller.
Check the indoor liquid pipe temperature dis-
play of outdoor controller board.