44
Error Code
Meaning of error code and detection method
Case
Judgment and action
A7
(6607)
A8
(6608)
5. If displayed address or attribute is
FRESH MASTER,
Indoor unit detects abnormality when
indoor unit transmitted to FRESH
MASTER and there was no reply (ACK).
1
During sequential operation
of indoor unit and FRESH
MASTER of other refrigerant
system, if indoor unit transmits
to FRESH MASTER while
outdoor unit power supply
of same refrigerant system
with FRESH MASTER is off
or within 2 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 receiving
circuit of indoor unit or FRESH
MASTER
6. If displayed address or attribute is
LOSSNAY,
Indoor unit detects abnormality when
indoor unit transmitted to LOSSNAY and
there was no reply (ACK).
1
If the power supply of
LOSSNAY 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
LOSSNAY while outdoor
unit power supply of same
refrigerant system with
LOSSNAY is 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
connector (CN2M) of indoor
unit
5
Defective transmitting
receiving circuit of indoor unit
or LOSSNAY
7. If displayed address or attribute is non-
existent
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 transmit-
ted because the address
of FRESH MASTER and
LOSSNAY are changed after
sequential operation of FRESH
MASTER and LOSSNAY by
remote controller.
M-NET• NO RESPONSE
Abnormal if a message was transmitted
and there were reply (ACK) that message
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).
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 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
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 mal-
function was accidental, the unit returns to
normal. If the same abnormality generates
again, controller of displayed address and
attribute may be defective.
From the previous page.
Same as mentioned in “A7” of the previous
page
OC379F
