Mitsubishi Electric PQHY-P200YLM-A Service Handbook page 321

[ 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
ME re- ME remote
mote con- controller (RC)
troller System con-
(RC) troller (SC)
MA remote
controller (MA)
System con-
troller
(SC)
HWE15060
Detection
method
No acknowl- Same as grouping of units in a sys-
edgement tem with multiple heat source units
(ACK) at IC
transmission to
RC
No acknowl- 1. Error occurrence on some IC
edgement
(1) Same cause as that for system
(ACK) at
with one heat source unit
MELANS
transmission to
2. Error occurrence on all IC in the
RC
system with one heat source unit
(1) An error is found by the heat
source unit.
Total capacity error (7100)
Capacity code error (7101)
Error in the number of connected
units (7102)
Address setting error (7105)
(2) Disconnection or short circuit of the
transmission line for the heat
source unit on the terminal block
for centralized control line connec-
tion (TB7)
(3) Turn off the power source of the
heat source unit
(4) Malfunction of electrical system for
the heat source unit
3. Error occurrence on all IC
(1) Same causes as (1) - (4) described
in 2.
(2) When the power supply unit for
transmission lines is used and the
male power supply connector is
connected to the female power
supply switch connector (CN40) for
the transmission line for central-
ized control
(3) Disconnection or shutdown of the
power source of the power supply
unit for transmission line
(4) System controller (MELANS) mal-
function
- 312 -
Cause
1)
2)
Check method and remedy
Same remedy as that for
grouping of units in a system
with multiple heat source
units
Same remedy as that for
system with one heat source
unit
Check the LED display for
troubleshooting on the heat
source unit.
 If an error is found, check
the check code definition,
and correct the error.
If no error is found, check
the cause 2).
Check (2) - (4) on the left.
Check (1) - (4) on the left.
GB