Mitsubishi Electric Mr. SLIM SEZ Series Technical & Service Manual page 42

[ VII TROUBLESHOOTING ]
Abnormal point and detection method
Error Code
Indoor/outdoor unit communication
error (Signal receiving error)
Abnormal if indoor controller board
cannot receive any signal normally for
six minutes after turning the power on.
Abnormal if indoor controller board
cannot receive any signal normally for
three minutes.
E6
Consider the unit as abnormal under the
following condition: When two or more
indoor units are connected to an
outdoor unit, indoor controller board
cannot receive a signal for three minutes
from outdoor controller circuit board, a
signal which allows outdoor controller
circuit board to transmit signals.
Indoor/outdoor unit communication
error (Transmitting error)
Abnormal if "1" receiving is detected 30
E7
times continuously though indoor controller
board has transmitted "0".
Indoor controller board
Abnormal if data cannot be read normally
FB(Fb)
from the nonvolatile memory of the indoor
controller board.
Remote controller control board
Abnormal if data cannot be read normal-
E1
ly from the nonvolatile memory of the
or
remote controller control board.
(Error code: E1)
E2
(6201
Abnormal if the clock function of remote
or
controller cannot be operated normally.
6202)
(Error code: E2)
Water leakage
This detection is performed during the
operation (stop, heating, fan, or error stop
mode etc.) other than cooling and dry.
When a) and b) are found, water leakage
occurs.
a) Pipe <liquid> temperature - inlet tem-
perature < -10˚C for 30 minutes
b) When drain float switch is detected to
be soaked in the water for 15 minutes
or more.
* When drain float switch is detected to
PA
be NOT soaked in the water, each
(2502)
counting of a) and b) is cleared.
(2500)
*When this error is detected, the error
will not be reset until the main power is
reset.
Fan motor trouble
PB(Pb)
HWE2101A
Cause
Contact failure, short circuit or,
mis-wiring (converse wiring) of
indoor/outdoor unit connecting
wire
Defective transmitting receiving
circuit of indoor controller board
Defective transmitting receiving
circuit of indoor controller board
Noise has entered into indoor/
outdoor unit connecting wire.
Defective transmitting receiving
circuit of indoor controller board
Noise has entered into power
supply.
Noise has entered into outdoor
control wire.
Defective indoor controller
board
Defective remote controller
Mis-piping of extension pipes
(When connected with multiple
units)
Mis-wiring of indoor/outdoor
unit connecting wire (When
connected with multiple units)
Detection failure of the indoor
unit inlet/ pipe <liquid> ther-
mistor
Drain pump failure
Drainage failure
· Clogged drain pump
· Clogged drain pipe
Drain float switch failure
· Drain float switch is detected
to be soaked in the water (ON
status) due to the operation
failure of the moving parts.
· Contact failure of drain float
switch connector
(Loose connector)
Defective fan motor
Defective indoor controller
board
- 39 - 39
Countermeasure
Check LED display on the outdoor control cir-
cuit board. (Connect A-control service tool,
PAC-SK52ST.)
Refer to Outdoor manual.
Check disconnection or looseness of indoor/
outdoor unit connecting wire of indoor unit or
outdoor unit.
Check all the units in case of twin triple
indoor unit system.
- Turn the power off, and on again to check.
If abnormality generates again, replace
indoor controller board or outdoor
controller circuit board.
Other indoor controller board may have
defect in case of twin triple indoor unit
system.
- Turn the power off, and on again to check.
If abnormality generates again, replace
indoor controller board.
Replace indoor controller board.
Replace remote controller.
Check the extension pipes for mis-piping.
Check the Indoor/outdoor unit connecting
wire for mis-wiring.
Check room temperature display on remote
controller and indoor pipe <liquid> tempera-
ture. (Refer to the countermeasure on P2.)
Check if drain-up machine works.
Check drain function.
Check drain float switch. (Refer to the coun-
termeasure on P4 and P5.)
Rifer to "VII [1] 8. DC FAN MOTOR (FAN
MOTOR/INDOOR CONTROLLER
BOARD)".
GB