M-Net Communication Error - Mitsubishi Electric PUHZ-P100VHA2 Service Manual

Error Code Abnormal points and detection method
Abnormal refrigerant circuit
During Cooling, Dry, or Auto Cooling
operation, when the following are
regarded as failures when detected for
one second.
a) The compressor continues to run for 30
or more seconds.
PL
b) The liquid pipe temperature or the
condense/evaporator temperature is
75°C or more.
* These detected errors will not be
cancelled until the power source is
reset.
<M-NET communication error>
Error Code Abnormal points and detection method
Duplicate address definition
This error is displayed when transmission
from the units of same address is detected.
A0
Note) The address and attribute displayed
(6600)
at remote controller indicate the
controller that detected abnormality.
Hardware error of transmission
processor
Transmission processor intended
to transmit "0", but "1" appeared on
transmission wire.
Note) The address and attribute display
A2 at remote controller indicate the
(6602)
controller that detected abnormality.
BUS BUSY
1. Overtime error by signal collision
damage
Abnormal if transmitting is not possible
for 8-10 minutes continuously because
of collision of transmission.
2. Data could not reach transmission wire
for 8-10 minutes continuously because
of noise or etc.
Note) The address and attribute displayed
at remote controller indicate the
A3
controller that detected abnormality.
(6603)
OCH415G
Case
1 Abnormal operation of 4-way
valve
2 Disconnection of or leakage in
refrigerant pipes
3 Air into refrigerant piping
4 Abnormal operation (no rotation)
of indoor fan
· Defective fan motor.
· Defective indoor control
board.
5 Defective refrigerant circuit
(clogging)
(Note) "Indoor unit" in the text indicates M-NET board in outdoor unit.
Case
1 There are 2 or more same
address of controller of outdoor
unit, indoor unit, FRESH
MASTER, or LOSSNAY.
2 Noise has entered into
transmission signal and signal
was transformed.
1 Error is detected if wave
form is transformed when
wiring works of transmission
wire of outdoor unit, indoor
unit, FRESH MASTER or
LOSSNAY are done, or polarity
is changed with the power on
and transmission data collide
each other.
2 Defective transmitting receiving
circuit of transmission
processor
3 Transmission data is changed
by the noise on transmission.
1 Transmission processor could
not transmit because short
cycle voltage of noise and
the like have entered into
transmission wire continuously.
2 Transmission quantity has
increased and transmission
is not possible because there
was wiring mistake of terminal
block for transmission wire
(TB3) and terminal block for
central control (TB7) in outdoor
unit.
3 Transmission is mixed with
others and occupation rate
on transmission wire rose
because of defective repeater
(a function to connector or
disconnect transmission of
control and central control
system) of outdoor unit, then
abnormality is detected.
58
Judgment and action
1 When this error occurs, be sure to
replace the 4-way valve.
2 Check refrigerant pipes for disconnection or
leakage.
3 After the recovery of refrigerant, vacuum
dry the whole refrigerant circuit.
4 Refer to section 11-6.
5 Check refrigerant circuit for operation.
* To avoid entry of moisture or air into
refrigerant circuit which could cause
abnormal high pressure, purge air in
refrigerant circuit or replace refrigerant.
Judgment and action
Search the unit with same address as
abnormality occurred. If the same address is
found, turn off the power supply of outdoor unit,
indoor unit and FRESH MASTER or LOSSNAY
at the same time for 2 minutes or more after
the address is corrected, and turn the power on
again.
Check transmission wave form or noise on
transmission wire.
1 If the work of transmission wire is done with
the power on, shut off the power supply of
outdoor unit and indoor unit and FRESH
MASTER or LOSSNAY at the same time for
2 minutes or more, and turn the power on
again.
2 Check transmission wave form or noise on
transmission wire.
1 Check if transmission wire of indoor unit,
FRESH MASTER, LOSSNAY, or remote
controller is not connected to terminal block
for central control (TB7) of outdoor unit.
2 Check if transmission wire of indoor unit,
FRESH MASTER or LOSSNAY is not
connected to terminal block for transmission
wire of outdoor unit.
3 Check if terminal block for transmission wire
(TB3) and terminal block for central control
(TB7) is not connected.
4 Check transmission wave form or noise on
transmission wire.