Mitsubishi Electric PUHZ-RP3VHA Technical & Service Manual page 36

Error Code Meaning of error code and detection method
5. If displayed address or attribute is
FRESH MASTER,
Indoor unit detects abnormality when
indoor unit transmitted to FRESH MAS-
TER and there was no reply (ACK).
6. If displayed address or attribute is
LOSSNAY,
Indoor unit detects abnormality when
indoor unit transmitted to LOSSNAY and
there was no reply (ACK).
A7
(6607)
7. If displayed address or attribute is
nonexistent,
M-NET•NO RESPONSE
Abnormal if a massage was transmitted
and there were reply (ACK) that massage
was received, but response command
does not return. Transmitting side detects
abnormality every 30 seconds, six times
continuously.
Note) The address and attribute displayed
at remote controller is indicate the
controller that did not reply (ACK).
A8
(6608)
Case
1 During sequential operation of
indoor unit and FRESH MAS-
TER of other refrigerant sys-
tem, if indoor unit transmits to
FRESH MASTER while out-
door unit power supply of
same refrigerant system with
FRESH MASTER is put off or
within two minutes of restart,
abnormality is detected.
2 Contact failure of transmission
wire of indoor unit or FRESH
MASTER
3 Disconnection of transmission
connector (CN2M) of indoor
unit or FRESH MASTER
4 Defective transmitting receiv-
ing circuit of indoor unit or
FRESH MASTER
1 If the power supply of LOSS-
NAY is off, indoor unit detects
abnormality when it transmits
to LOSSNAY.
2 During sequential operation of
indoor unit and LOSSNAY of
other refrigerant system, if
indoor unit transmits to LOSS-
NAY while outdoor unit power
supply of same refrigerant sys-
tem with LOSSNAY is put off
or within two minutes of
restart, abnormality is detect-
ed.
3 Contact failure of transmission
wire of indoor unit of LOSS-
NAY
4 Disconnection of transmission
connector (CN2M) of indoor
unit
5 Defective transmitting receiv-
ing circuit of indoor unit or
LOSSNAY
1 The unit of former address
does not exist as address
switch has changed while the
unit was energized.
2 Abnormality is detected when
indoor unit transmitted
because the address of
FRESH MASTER and LOSS-
NAY are changed after
sequential operation of
FRESH MASTER and LOSS-
NAY by remote controller.
1 Transmitting condition is
repeated fault because of
noise and the like.
2 Extension of transmission wire
voltage and signal is caused
by over-range transmission
wire.
• Maximum distance ······200m
• Remote controller line ··(12m)
3 Extension of transmission wire
voltage and signal is caused
by type-unmatched transmis-
sion wire.
Type ······
With shield wire-
CVVS, CPEVS
With normal wire (no shield)-
VCTF, VCTFK, CVV
CVS, VVR, VVF, VCT
Diameter····125mm 2 or more
4 Accidental malfunction of
abnormality-generated con-
troller
36
Judgment and action
1 Check transmission waveform or noise on
transmission wire.
2 Shut off the power supply of outdoor unit and
indoor unit and FRESH MASTER or LOSS-
NAY at the same time for two minutes or
more, and put the power on again. If mal-
function was accidental, the unit returns to
normal. If the same abnormality generates
again, controller of displayed address and
attribute may be defective.