Mitsubishi PUHY-EP250 - Error Code [6607] Error Source Address = Indoor Unit (IC)

[7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ]
- 185 -
HWE12050 GB
7 Troubleshooting Using Error Codes
7-8-9 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 indoor units (B)
Troubleshooting prob-
lems for indoor units (B)
& &
Troubleshooting problems
for all units (A)
Troubleshooting prob-
lems for all units (A)
Cause Check method and remedy
(1) Incidental cause 1) Turn off the outdoor/indoor units for 5 or more min-
utes, and turn them on again.
(2) When IC unit address is changed or modified during op-
eration.
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 connected to the
female power supply switch connector (CN40) for the
transmission line for centralized control
Check voltage of the transmission line for central-
ized control.
20 V or more: Check (1) on the left.
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