Error Code [6607] Error Source Address = Indoor Unit (Ic) - Mitsubishi Electric HP120TNU-A Service Handbook

[7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ]
7-8-10

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
Error display
ME remote controller (RC), MA remote controller (MA)
Types of refrigerant
systems
Single refrigerant system
Troubleshooting prob-
lems for indoor units (A)
(1) Troubleshooting problems for indoor units (A)
(1) Incidental cause
(2) When IC unit address is changed or modified during op-
eration.
(3) Faulty or disconnected IC transmission wiring
(4) Disconnected IC connector
(CN2M)
(5) Indoor unit controller failure
(6) ME remote controller failure
HWE18220_GB
Grouped operation of multi- Types of indoor units experiencing
ple refrigerant systems problems
Part of the indoor units
Troubleshooting problems Troubleshooting prob-
for indoor units (A) lems for indoor units (A)
&
Troubleshooting problems
for all units (A)
Cause
System controller (SC)
All indoor units (IC) in
(IC) are experiencing the same system are
problems. experiencing problems.
Troubleshooting prob-
lems for all units (B)
Check method and remedy
1) Turn off the outdoor/indoor units for 5 or more min-
utes, and turn them on again.
2) If the error is accidental, it will run normally. If not,
check the causes (2) - (6).
All indoor units (IC) are
experiencing problems.
Troubleshooting prob-
lems for indoor units (B)
&
Troubleshooting prob-
lems for all units (B)
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