Mitsubishi Electric Mr.Slim PUHZ-SHW80VHA Service Manual page 35

From the previous page.
Error Code Abnormal point and detection method
4. If displayed address or attribute is
remote controller, indoor unit detects
abnormality when indoor unit transmits
signal to remote controller and there
was no reply (ACK).
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).
A7
(6607)
6. If displayed address or attribute
is LOSSNAY, indoor unit detects
abnormality when indoor unit transmits
signal to LOSSNAY and there was no
reply (ACK).
7. If displayed address or attribute is
nonexistent.
OCH526
Case
1 During group operation with
indoor unit of multi-refrigerant
system, if indoor unit transmit
signal to remote controller
while outdoor unit power
supply of one refrigerant
system is turned off or within 2
minutes of restart, abnormality
is detected.
2 Contact failure of transmission
wire of remote controller or
indoor unit
3 Disconnection of transmission
connector (CN2M) of indoor
unit
4 Defective transmitting receiving
circuit of indoor unit or remote
controller
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
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
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
connector (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
sequential operation of FRESH
MASTER and LOSSNAY by
remote controller.
35
Judgment and action
Same as mentioned in "A7" of the previous
page.