Mitsubishi Electric PUHZ-ZRP35VKA Service Manual page 50

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
Address duplicate 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.
Hard ware error of transmission
processor
Transmission processor intended
to transmit "0", but "1" appeared on
transmission wire.
A2
Note) The address and attribute display
(6602)
at remote controller indicate the
controller that detected abnormality.
BUS BUSY
1. Overtime error by 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
A3
at remote controller indicate the
(6603)
controller that detected abnormality.
Communication error with
communication processor
Defective communication between unit
A6
processor and transmission processor
(6606)
Note) The address and attribute display
at remote controller indicate the
controller that detected abnormality.
OCH527B
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 waveform 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 signal 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 are 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.
1 Data of transmission processor
or unit processor is not
transmitted normally because
of accidental trouble such as
noise or thunder surge.
2 Address forwarding from unit
processor is not transmitted
normally because of defective
transmission processor
hardware.
50
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, shut the power supply of outdoor
unit and 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 waveform or noise on
transmission wire.
1 If the works 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 waveform 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 waveform or noise on
transmission wire.
Turn off the power supply of outdoor unit,
indoor unit and FRESH MASTER or LOSSNAY
at the same time for 2 minutes or more, and
turn the power on again. System returns
normally if abnormality was accidental
malfunction. If the same abnormality generates
again, abnormality-generated controller may be
defective.