Mitsubishi Electric PQHY-P72ZLMU-A Service Handbook page 287

[ 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
(1) System with one heat source unit
Error
Error dis-
source
play
address
Heat ME re-
source mote con-
unit (OC) troller
(RC)
MA re-
mote con-
troller
(MA)
BC con- ME re-
troller mote con-
(BC) troller
(RC)
MA re-
mote con-
troller
(MA)
Indoor ME re-
unit (IC) mote con-
troller
(RC)
MA re-
mote con-
troller
(MA)
LOSS- ME re-
NAY mote con-
(LC) troller
(RC)
MA re-
mote con-
troller
(MA)
ME re- ME re-
mote mote con-
control- troller
ler (RC) (RC)
MA re-
mote con-
troller
(MA)
HWE15150
Detection
method
No ac- (1) Contact failure of transmission line of OC or IC
knowl-
(2) Decrease of transmission line voltage/signal by ex-
edgement
ceeding acceptable range of transmission wiring.
(ACK) at
Farthest:200 m [656ft] or less
IC trans-
Remote controller wiring:
mission to
10m [32ft] or less
OC
(3) Erroneous sizing of transmission line (Not within the
range below). Wire diameter:
2
1.25mm [AWG16] or more
(4) Heat source unit control board failure
No ac- (1) When BC controller address is changed or modified
knowl- during operation.
edgement
(2) Faulty or disconnected transmission wiring of BC
(ACK) at
controller
IC trans-
mission to
(3) Disconnected connector of BC controller (CN02)
BC
(4) Faulty control board of BC controller
No ac- (1) When IC unit address is changed or modified during
knowl- operation.
edgement
(2) Faulty or disconnected IC transmission wiring
(ACK) at
RC trans-
(3) Disconnected IC connector
mission to
(CN2M)
IC
(4) Indoor unit controller failure
(5) ME remote controller failure
No ac- (1) The power source of LOSSNAY has been shut off.
knowl-
(2) When the address of LOSSNAY is changed in the
edgement
middle of the operation
(ACK) at
IC trans-
(3) Faulty or disconnected transmission wiring of
mission to
LOSSNAY
LC
(4) Disconnected connector (CN1) on LOSSNAY
(5) Controller failure of LOSSNAY
No ac- (1) Faulty transmission wiring at IC unit side.
knowl-
(2) Faulty wiring of the transmission line for ME remote
edgement
controller
(ACK) at
IC trans-
(3) When the address of ME remote controller is
mission to
changed in the middle of the operation
RC
(4) ME remote controller failure
Cause
- 278 -
Check method and remedy
Turn off the power
source of the heat
source unit, and turn it
on again.
If the error is accidental,
it will run normally. If not,
check the causes (1) -
(4).
Turn off the heat source-
indoor units for 5 or
more minutes, and turn
them on again.
If the error is accidental,
they will run normally. If
not, check the causes
(1) - (4).
Turn off the heat source-
indoor units for 5 or
more minutes, and turn
them on again.
If the error is accidental,
they will run normally.
If not, check the causes
(1) - (5).
Turn off the power
source of LOSSNAY
and turn it on again.
If the error is accidental,
it will run normally.
If not, check the causes
(1) - (5).
Turn off the power
source of the heat
source unit for 5 minutes
or more, and turn it on
again.
If the error is accidental,
it will run normally.
If not, check the causes
(1) - (4).
GB