Mitsubishi Electric PURY-P200 Service Handbook page 148

Checking code Meaning, detecting method
6831 MA 1. Communication between the
Communication MA remote controller and the
no reception indoor unit is not done
error properly.
2. No proper data has been
received for 3 minutes.
6834
MA 1. Communication between the
Communication MA remote controller and the
start bit error indoor unit is not done
properly.
2. No proper data has been
received for 2 minutes.
6832
MA
1. Communication between the
Communication
MA remote controller and the
synchroniza- indoor unit is not done
tion recovery properly.
error 2. When transmission is
impossible because the
emptiness of the transfer path
cannot be checked.
Indoor unit
Remote controller : 6 seconds
6833
MA 1. Communication between the
Communication MA remote controller and the
transmission indoor unit is not done
/reception
properly.
hardware error
2. When the transmitted data is
received at the same time and
compared, the different state
continues 30 times.
Factor
(1) The remote control line of
the MA remote controller or
the indoor unit has a poor
contact.
(2) All remote controllers are
slaves.
(3) The wiring specifications are
not observed.
1. Wire length
2. Wire thickness
3. Number of remote
controllers
4. Number of indoor units
(4) After the remote controller is
connected, disconnection of
the remote controller without
resetting the power.
(5) Noise enters the transfer
path of the remote controller.
(6) The transmission/reception
circuit of the remote
controller of the indoor unit is
poor.
(7) The transmission/reception
circuit of the remote
controller is defective.
(1) The remote control line of
the MA remote controller or
the indoor unit is in poor
contact.
(2) It is set on two or more main
remote controllers.
(3) The indoor unit address is
set twice.
: 3 minutes (4) Noise enters the remote
controller line.
(5) The wiring specifications are
not observed.
1. Wire length
2. Wire thickness
3. Number of remote
controllers
4. Number of indoor units
(6) The transmission/reception
circuit of the remote
controller is defective.
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Checking method & Remedy
(1) Check the transmission lines
of the indoor unit and MA
remote controller for
disconnection and looseness.
(2) Check the power supply to
the main power and remote
controller lines.
(3) Check whether the tolerable
range of the MA remote
controller line is exceeded or
not.
(4) Check the main/slave setting
of the MA remote controller.
(5) Diagnose the remote
controller.
(Remote controller IM
description)
Result:
[OK]: No problem in the remote
controller
(wiring specifications
check)
[NO]: Replace the remote
controller
[6832, 6833, ERC]:
Noise is the cause.
< To (6) >
(6) Check the transmission
waveform and noise on the
transmission signal of MA
remote controller line.
(7) If no problem is present in
items.
1) to (6) above, replace the
indoor controller board or
MA remote controller.
The following states can be
checked from LED1 and
LED2 on the indoor
controller board.
• LED1 is lit at the same time.
The main power is
supplied to the indoor unit.
• LED2 alone is lit.
Power is supplied to the
MA remote controller line.