Mitsubishi Electric QAHV Série Manuel D'installation & D'instructions page 66

Error
code *1
(PCB *2 Error type
RC
M-NET)
Remote Address overlap
6830
controller
error (incl.
Non-consecutive address, system error
7109 remote
controller
wiring Remote controller signal reception error 1 Remote controller cable is not
fault)
6831
Remote controller signal transmission
6832
error
Remote controller over current
6833
Remote controller signal reception error 2 Communication error due to external
6834
Multiple Incompatible combination of units
7130
system
error
No.-of-connected-unit setting is incorrect. No.-of-connected-unit setting is
7102
Analog input error
4126
(Control board (MAIN) CN421)
1
( )
Communication error between the main and sub units
6500
Communication error between the MAIN and SUB
circuits
Transmission line power supply PCB fault
6600
Communication error between the main and sub units
6602
(Simple multiple unit control mode)
6603
6606
6607
6608
Water flow adjusting value limit switch error
5701
Secondary side hot water temperature reduction error Insufficient pump capacity
2518
Secondary side heat exchanger error
2616
(Deterioration of heat exchanger)
1
( )
Secondary side heat exchanger error
2616
(Heat exchanger selection error)
2
( )
*1: The codes in the parentheses in the "Error code" column indicate error detail codes.
*2: If an error occurs, error codes shown above will appear in the 4-digit digital display on the PCB.
*3: Definition of symbols in the "Error reset" column.
: Errors that can be reset regardless of the switch settings
: Errors that can be reset if the remote reset setting on the unit is set to "Enable" (factory setting)
Errors that cannot be reset if the remote reset setting on the unit is set to "Disable"
: Errors that cannot be reset
: Errors that will be automatically cancelled once its cause is removed
*4: Power failure will be detected as an error only when the "Automatic recovery after power failure" setting on the unit is set to "Disable."
(The default setting for the "Automatic recovery after power failure" setting is "Enable.")
*5: Depending on the system configuration, if communication error lasts for 10 minutes or longer, units will make an abnormal stop.
This error can be reset by turning off and then back on the unit's power.
*6: This error code will appear when multiple errors occur that are reset in different ways and when one or more of these errors have not been reset. This error can be
reset by turning off and then back on the unit's power.
*7: Before resetting this error, remove its causes. Resuming operation without removing the causes of heat exchanger freeze up will cause heat exchanger damage.
Cause
(Installation/Setting error)
There are two or more of the same
address.
Address setting error
(Non-consecutive address)
connected.
Broken wiring
Communication error due to external
noise interference
Remote controller cable is short
noise interference
Different types of units are connected to
the same system.
incorrect (Main unit).
Analog input type fault
Set Item code 1075
Communication error due to external
noise interference
*7
Outdoor air temperature is below
operating range lower limit
Heat exchanger deteriorated
Initial heat exchanger selection error
GB-66
Cause
(Parts problems)
• Broken remote controller wiring
• Main control board communication circuit
fault
• Main control board communication circuit
fault
• Main control board communication circuit
fault
• Broken or Open 4-20mA signal output
device wiring (CN421)
• Broken wiring to the transmission power
supply circuit board (between the main
and sub units)
• Transmission power supply PCB
communication circuit fault
Water flow rate control valve fault
Power board fault
Secondary side pump fault
Secondary side heat exchanger
deteriorated
Flow sensor fault
Error reset *3
Unit
side Remote
(PCB)
Operation
SWS1
SW