Mitsubishi Electric R410A, Service Handbook

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[7-7 Error Code Definitions and Solutions: Codes [6000 - 6999] ]
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7-7-9 Error Code [6607] Error Source Address = Indoor Unit (IC)
1. Error code definition
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. Cause, check method and remedy
(1) Troubleshooting problems for indoor units (A)
(2) Troubleshooting problems for indoor units (B)
Error display
ME remote controller (RC), MA remote controller (MA) System controller (SC)
Types of refrigerant
systems
Single refrigerant system
Grouped operation of multi-
ple refrigerant systems
Types of indoor units experiencing
problems
Part of the indoor units
(IC) are experiencing
problems.
All indoor units (IC) in
the same system are
experiencing problems.
All indoor units (IC) are
experiencing problems.
Troubleshooting prob-
lems for indoor units (A)
Troubleshooting problems
for indoor units (A)
Troubleshooting prob-
lems for indoor units (A)
Troubleshooting prob-
lems for all units (B)
Troubleshooting prob-
lems for indoor units (B)
& &
Troubleshooting problems
for all units (A)
Troubleshooting prob-
lems for all units (B)
Cause Check method and remedy
(1) Incidental cause 1) Turn off the outdoor/indoor units for 5 or more minutes,
and turn them on again.
(2) When IC unit address is changed or modified during
operation. 2) If the error is accidental, it will run normally. If not, check
the causes (2) - (6).
(3) Faulty or disconnected IC transmission wiring
(4) Disconnected IC connector (CN2M)
(5) Indoor unit controller failure
(6) ME remote controller failure
Cause Check method and remedy
(1) When the power supply unit for transmission lines is
used and the male power supply connector is con-
nected to the female power supply switch connector
(CN40) for the transmission line for centralized control 1) Check voltage of the transmission line for centralized con-
trol.
Œ
20 V or more: Check (1) on the left.
Œ
Less than 20 V: Check (2) on the left.
(2) Disconnection or shutdown of the power source of the
power supply unit for transmission line
(3) System controller (MELANS) malfunction 2) Check the causes of the error indicated by the error codes
listed in items (1) through (3) in the "Cause" column.
(4) The TLMU outdoor unit's central control connector
(CN40) is inserted. 3) When the male power supply connector is connected from TLMU
outdoor unit to CN40, the power supplied to TB7 side even when
the main power of the TLMU outdoor unit is switched off, and the
System controller may store an error in the error history and emit
an alarm signal.