Mitsubishi Electric PUHZ-ZRP35VKA2 Service Manual page 42

From the previous page.
Check Code Abnormal points and detection method
5. If displayed address or attribute is
FRESH MASTER, indoor unit detects
abnormality when indoor unit transmits
signal to FRESH MASTER and there
was no reply (ACK).
6. If displayed address or attribute is
LOSSNAY, indoor unit detects abnormal-
ity when indoor unit transmits signal to
LOSSNAY and there was no reply (ACK).
A7
(6607)
7. If displayed address or attribute is non-
existent.
M-NET NO RESPONSE
Abnormal if a message was transmitted and
there are reply (ACK) that message was
received, but response command does not
return. Transmitting side detects abnormal-
ity every 30 seconds, 6 times continuously.
Note: The address and attribute displayed
at remote controller indicate the con-
troller that did not reply (ACK).
A8
(6608)
OCH635A
Cause
1 During sequential operation of indoor
unit and FRESH MASTER of other
refrigerant system, if indoor unit
transmits signal to FRESH MASTER
while outdoor unit power supply of
same refrigerant system with FRESH
MASTER is turned off or within 2 min-
utes of restart, abnormality is detect-
ed.
2 Contact failure of transmission wire of
indoor unit or FRESH MASTER
3 Disconnection of transmission connec-
tor (CN2M) of indoor unit or FRESH
MASTER
4 Defective transmitting receiving circuit
of indoor unit or FRESH MASTER
1 If the power supply of LOSSNAY is off,
indoor unit detects abnormality when it
transmits signal to LOSSNAY.
2 During sequential operation of indoor
unit and LOSSNAY of other refrigerant
system, if indoor unit transmits signal
to LOSSNAY while outdoor unit power
supply of same refrigerant system
with LOSSNAY is turned off or within
2 minutes of restart, abnormality is
detected.
3 Contact failure of transmission wire of
indoor unit of LOSSNAY
4 Disconnection of transmission connec-
tor (CN2M) of indoor unit
5 Defective transmitting receiving 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 transmits signal because the
address of FRESH MASTER and
LOSSNAY are changed after sequen-
tial operation of FRESH MASTER and
LOSSNAY by remote controller.
1 Transmitting condition is repeated fault
because of noise and the like.
2 Extinction of transmission wire voltage
and signal is caused by over-range
transmission wire.
• Maximum distance ..... 200 m
• Remote controller line (12 m)
3 Extinction of transmission wire volt-
age and signal is caused by type-
unmatched transmission wire.
Type. ........
With shield wire-
CVVS, CPEVS
With normal wire (no shield)-
VCTF, VCTFK, CVV
CVS, VVR, VVF, VCT
Diameter ..... 1.25mm
2
or more
4 Accidental malfunction of abnormality-
generated controller
42
Judgment and action
Same as mentioned in "A7" of the pre-
vious page.
1 Check transmission waveform or noise
on transmission wire.
2 Turn 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. If malfunction was
accidental, the unit returns to normal. If
the same abnormality generates again,
controller of displayed address and
attribute may be defective.