Mitsubishi Electric PUHY-P200 Service Handbook page 118

Checking
code
6607 No ACK abnormality
(continued)
System
Generating
Display of
com- unit
trouble
position address
4. System Remote
controller controller
(SC) (RC)
Meaning, detecting method
When no ACK signal is detected in 6 continuous times with 30 seconds
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
Cause
method
No reply Trouble of partial remote
(ACK) at controller:
transmission (1) Faulty wiring of RC
of IC to SC transmission line.
(2) Disconnection or poor
contact of RC transmission
connector.
(3) Faulty RC.
Trouble of all IC in one
refrigerant system.
(1) Error detected by OC unit.
Total capacity error (7100)
Capacity code setting error
(7101)
Connecting number error
(7102)
Address setting error (7105)
(2) Disconnection or short circuit
of transmission line of OC
unit terminal block for central
control (TB7).
(3) Power source shut down of
OC unit.
(4) Trouble of OC unit electrical
system.
Trouble of all RC:
(1) As same that for single
refrigerant system.
(2) When using the power
supply unit for transmission
line, the power supply
connector (CN40) is inserted
into the transmission line for
centralized control.
(3) Disconnection or power
shutdown of power supply
unit for transmission line.
(4) Faulty MELANS.
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Cause checking method &
Countermeasure
Check the causes of (1) ~ (3) left.
Confirm OC trouble diagnosis LED.
→ At trouble generation, check for the
content according to check code.
Check the content of (2) ~ (4) shown
left.
Check the causes (1) ~ (4) left.