Mitsubishi Electric Mr.SERVICE PUHZ-HRP71VHA Service Manual page 44

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 abnormal-
ity when indoor unit transmits signal to
LOSSNAY and there was no reply (ACK).
7. If displayed address or attribute is non-
existent.
Case
1 During group operation with
indoor unit of multi-refrigerant
system, if indoor unit transmit
signal to remote controller
while outdoor unit power sup-
ply of one refrigerant system
is turned off or within 2 min-
utes 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 sup-
ply of same refrigerant sys-
tem 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 refrig-
erant system with LOSSNAY
is turned off or within 2 min-
utes of restart, abnormality is
detected.
3 Contact failure of transmis-
sion wire of indoor unit of
LOSSNAY
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 transmits
signal because the address
of FRESH MASTER and
LOSSNAY are changed after
sequential operation of FRESH
MASTER and LOSSNAY by
remote controller.
44
Judgment and action
Same as mentioned in "A7" of the previous
page.