Mitsubishi Electric PUHZ-P200YHA Service Manual page 32

Abnormal point and detection method
Error Code
Compressor overcurrent interruption
Abnormal if overcurrent DC bus or com-
pressor is detected after compressor starts
operating for 30 seconds.
UP
(4210)
Remote controller transmission error
(E0)/signal receiving error (E4)
1 Abnormal if main or sub remote con-
troller cannot receive any transmission
normally from indoor unit of refrigerant
address "0" for 3 minutes.
(Error code : E0)
2 Abnormal if sub-remote controller could
not receive any signal for 2 minutes.
(Error code: E0)
1 Abnormal if indoor controller board can
E0
not receive any data normally from
or
remote controller board or from other
E4
indoor controller board for 3 minutes.
(Error code: E4)
2 Indoor controller board cannot receive
any signal from remote controller for 2
minutes. (Error code: E4)
Remote controller control board
1 Abnormal if data cannot be read nor-
mally from the nonvolatile memory of the
remote controller control board.
(Error code: E1)
2 Abnormal if the clock function of remote
controller cannot be operated normally.
(Error code: E2)
E1
or
E2
OCH424E
Case
1 Stop valve of outdoor unit is
closed.
2 Decrease of power supply volt-
age
3 Looseness, disconnection or
converse of compressor wiring
connection
4 Defective fan of indoor/outdoor
units
5 Short cycle of indoor/outdoor
units
6 Defective input circuit of out-
door controller board
7 Defective compressor
8 Defective outdoor power circuit
board
9 Dip switch setting difference of
outdoor controller circuit board
1 Contact failure at transmission
wire of remote controller
2 All remote controllers are set
as "sub" remote controller. In
this case, E0 is displayed on
remote controller, and E4 is
displayed at LED (LED1, LED2)
on the outdoor controller circuit
board.
3 Miswiring of remote controller
4 Defective transmitting receiving
circuit of remote controller
5 Defective transmitting receiving
circuit of indoor controller board
of refrigerant address "0"
6 Noise has entered into the
transmission wire of remote
controller.
1 Defective remote controller
32
Judgment and action
1 Open stop valve.
2 Check facility of power supply.
3 Correct the wiring (U·V·W phase) to
compressor. Refer to 11-9 (Outdoor power
circuit board).
4 Check indoor/outdoor fan.
5 Solve short cycle.
6 Replace outdoor controller circuit board.
W Before the replacement of the outdoor control-
ler circuit board, disconnect the wiring to com-
pressor from the outdoor power circuit board
and check the output voltage among phases,
U, V, W, during test run. No defect on board
if voltage among phases (U-V, V-W and W-U)
is same. Make sure to perform the voltage
check with same performing frequency.
7 Check compressor. Refer to 11-6.
8 Replace outdoor power circuit board.
9 Check the dip switch setting of outdoor con-
troller circuit board.
1 Check disconnection or looseness of indoor
unit or transmission wire of remote controller.
2 Set one of the remote controllers "main", If
there is no problem with the action above.
3 Check wiring of remote controller.
• Total wiring length: max. 500m
(Do not use cable × 3 or more.)
• The number of connecting indoor units:
max. 16 units
• The number of connecting remote control-
ler: max. 2 units
When the above-mentioned problem of 1~3
are not applied
4 Diagnose remote controllers.
a) When "RC OK" is displayed, remote con-
trollers have no problem.
Turn the power off, and on again to check.
If abnormality generates again, replace
indoor controller board.
b) When "RC NG" is displayed, replace
remote controller.
c) When "RC E3" or "ERC 00-66" is dis-
played, noise may be causing abnormality.
* If the unit is not normal after replacing
indoor controller board in group control,
indoor controller board of address "0"
may be abnormal.
1 Replace remote controller.