Mitsubishi Electric PUHY-P200 Service Handbook page 250

[ IX Troubleshooting ]
1. Error Code
6607
No ACK error
2. Error definition and error detection method
The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans-
mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.)
The address/attribute appeared on the display on the remote controller indicates the controller which did not provide
the response (ACK).
3. System configuration
(3) System connected to the system controllers (MELANS)
Error
source Error display
address
Out- ME remote
door controller (RC)
unit System control-
(OC) ler (SC)
MA remote
controller (MA)
Indoor ME remote
unit controller (RC)
(IC) MA remote
controller (MA)
System control-
ler (SC)
HWE10040
Detection
method
No acknowl- Same cause as that for system with one
edgement outdoor unit
(ACK) at IC
transmis-
sion to OC
No acknowl- Same as grouping of units in a system
edgement with multiple outdoor units
(ACK) at RC
transmis-
sion to IC
No acknowl- 1. Error occurrence on some IC
edgement
(1) Same cause as that for system with one
(ACK) at SC
outdoor unit
transmis-
sion to IC
2. Error occurrence on all IC in the system
with one outdoor unit
(1) Total capacity error (7100)
(2) Capacity code error (7101)
(3) Error in the number of connected units
(7102)
(4) Address setting error (7105)
(5) Disconnection or short circuit of the trans-
mission line for the outdoor unit on the ter-
minal block for centralized control line
connection (TB7)
(6) Turn off the power source of the outdoor
unit
(7) Malfunction of electrical system for the
outdoor unit
3. Error occurrence on all IC
(1) Same causes as (1) - (7) described in 2.
(2) The male power supply connectors on 2
or more outdoor units are connected to
the female power supply switch connector
(CN40) for the transmission line for cen-
tralized control.
(3) Disconnection or shutdown of the power
source of the power supply unit for trans-
mission line
(4) System controller (MELANS) malfunction
Cause
- 241 -
Check method and remedy
Same remedy as that for
system with one outdoor
unit
Same remedy as that for
grouping of units in a sys-
tem with multiple outdoor
units
Same remedy as that for
system with one outdoor
unit
1) Check the LED display
for troubleshooting on the
outdoor unit.
If an error is found,
check the check code
definition, and correct
the error.
If no error is found,
check 2).
2) Check (5) - (7) on the left.
Check voltage of the
transmission line for cen-
tralized control.
20V or more: Check (1)
and (2) on the left.
Less than 20V: Check
(3) on the left.
GB