Mitsubishi Electric CITY MULTI PQRY-P200YMF-B Service Handbook page 129

Checking
code
6607 No ACK error
(continued)
System
Generating Display of
compo-
unit address trouble
sition
1 Heat
Remote
source control-
unit (OC) ler (RC)
2 BC Remote
controller control-
(BC) ler (RC)
3 Indoor Remote
unit (IC) control-
ler (RC)
4 Remote Remote
controller control-
(RC) ler (RC)
Meaning, detecting method
When no ACK signal is detected in 6 continuous times with 30 second
interval by transmission side controller, the transmission side detects error.
Note: The address/attribute shown on remote controller indicates the
controller not providing the answer (ACK).
Detecting
method
No reply As same that for single refrigerant system.
(ACK) at
BC
transmis-
sion to OC
No replay As same that for single refrigerant system.
(ACK) at IC
transmis-
sion to BC
No reply 1) Cause of 1) ~ 5) of "Cause for single refriger-
(ACK) at ant system".
RC 2) Slipping off or short circuit of transmission line
transmis- of OC terminal block for centralized control
sion to IC (TB7).
3) Shut down of OC unit power source of one
re-frigerant system.
4) Neglecting insertion of OC unit power supply
connector (CN40).
5) Inserting more than 2 sets of power supply
connector (CN40) for centralized control use.
For generation after normal operation conduct-
ed once, the following causes can be consider-
ed.
• Total capacity error
• Capacity code setting error
• Connecting set number error
• Address setting error
No reply 1) Cause of 1) ~ 3) of "Cause for single refri-
(ACK) at IC gerant system".
transmis- 2) Slipping off or short circuit of transmission line
sion to RC of OC terminal block for centralized con-trol
(TB7).
3) Shut down of OC unit power source of one
refrigerant system.
4) Neglecting insertion of OC unit power supply
connector (CN40).
5) Inserting more than 2 sets of power supply
connector (CN40) for centralized control use.
At generation after normal operation conducted
once, the following causes can be considered.
• Total capacity error
• Capacity code setting error
• Connecting set number error
• Address setting error
Cause
(7100)
(7101)
(7102)
(7105)
(7100)
(7101)
(7102)
(7105)
–126–
Checking method & countermeasure
Same as measure for single refrigerant
system.
Same as measure for single refrigerant
system.
a) Shut down the power source of both
IC and OC for over 5 minutes simul-
taneously, and make them again.
Normal state will be returned incase
of accidental trouble.
b) Check for 1) ~ 5) of causes. If cause
is found, remedy it.
c) Check other remote controller or OC
unit LED for troubleshooting for
trouble.
→ Modify the trouble ac-
Trouble
cording to the content
of check code.
No trouble → Faulty indoor con-
troller
a) Shut down the power source of OC
for over 5 minute, and make it again.
Normal state will be returned in case
of accidental trouble.
b) Check for 1) ~ 5) of causes. If cause
is found, remedy it.
When normal state can not be ob-
tained, check 1) ~ 5) of causes.