Mitsubishi Electric PQHY-P72TYHMU-A Service Handbook page 282

[ 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
Heat ME remote
source controller (RC)
unit System control-
(OC) ler (SC)
MA remote
controller (MA)
BC con- ME remote
troller controller (RC)
(BC) system control-
ler (SC)
MA remote
controller (MA)
HWE09080
Detection
method
No acknowl- Same cause as that for system with one
edgement heat source unit
(ACK) at IC
transmis-
sion to OC
No acknowl- Same cause as that for system with one
edgement heat source unit
(ACK) at IC
transmis-
sion to BC
- 273 -
Cause Check method and remedy
Same remedy as that for
system with one heat
source unit
Same remedy as that for
system with one heat
source unit
GB