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IV - OPERATING FAULTS
1 - OPERATING FAULTS LIST
Display A0 Description Solution
Outside sensor fault Check that the sensor is correctly fitted and
connected
Boiler sensor 1 fault Check that the sensor is correctly fitted and
connected
Flue gas detector fault Check that the sensor is correctly fitted and
connected
Flow sensor 2 fault Check that the sensor is correctly fitted and
connected
Return sensor 1 fault Check that the sensor is correctly fitted and
connected
Domestic hot water sensor 1 fault Check that the sensor is correctly fitted and
connected
Room device 1 faulty Check the boiler connections
Room device 1 error or radio clock error Check compatibility of the room device or
clock
Water pressure sensor fault Check the connections of the pressure
sensor
Short-circuit on LPB or no voltage Check the wiring
Two identical addresses on the LPB Check the addressing
Loss of data in the EEPROM Change the LMU
Component fault in the LMU Change the LMU
Two master clocks (only one normally),
programming problem
Check parameter 96 of the QAA73 (only one
device can have the message “QAA73”)
Maintenance alarm Check the maintenance code value, QAA 73
setting 726 (section 2 -page 19 - chapter IV -
OPERATING FAULTS - SERVICING
MANUAL)
STB (boiler overheating safety) activated Check that shunt X3-01 is present and
whether the installation water flow is sufficient
(circulating pump, isolation valve, etc.)
Response of the safety thermostat Check whether the installation water flow is
sufficient (circulating pump, isolation valve,
etc.)
Flue gas alarm displayed (problem of the
flue gas temperature being too high)
Check whether the boiler is not on thermal
overload or that the exchanger is not clogged
Water pressure too high Check and adjust the pressure level if
necessary with P < 4 bar
Water pressure too low Check and adjust the pressure level if
necessary with P > 0.4 bar
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