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1 - OPERATING FAULTS LIST
Display A0
Outside sensor fault
Boiler sensor 1 fault
Flue gas detector fault
Flow sensor 2 fault
Return sensor 1 fault
Domestic hot water sensor 1 fault
Room device 1 faulty
Room device 1 error or radio clock error
Water pressure sensor fault
Short-circuit on LPB or no voltage
Two identical addresses on the LPB
Loss of data in the EEPROM
Component fault in the LMU
Two master clocks (only one normally),
programming problem
Maintenance alarm
STB (boiler overheating safety) activated
Response of the safety thermostat
Flue gas alarm displayed (problem of the
flue gas temperature being too high)
Water pressure too high
Water pressure too low
III - OPERATING FAULTS
Description
- 11 -
Solution
Check that the sensor is correctly fitted and
connected
Check that the sensor is correctly fitted and
connected
Check that the sensor is correctly fitted and
connected
Check that the sensor is correctly fitted and
connected
Check that the sensor is correctly fitted and
connected
Check that the sensor is correctly fitted and
connected
Check the boiler connections
Check compatibility of the room device or
clock
Check the connections of the pressure
sensor
Check the wiring
Check the addressing
Change the LMU
Change the LMU
Check parameter 96 of the QAA73 (only one
device can have the message "QAA73")
Check the maintenance code value, QAA 73
setting 726 (section 2 -page 13 - chapter III -
OPERATING FAULTS - SERVICING)
Check that shunt X3-01 is present and
whether the installation water flow is sufficient
(circulating pump, isolation valve, etc.)
Check whether the installation water flow is
sufficient (circulating pump, isolation valve,
etc.)
Check whether the boiler is not on thermal
overload or that the exchanger is not clogged
Check and adjust the pressure level if
necessary with P < 4 bar
Check and adjust the pressure level if
necessary with P > 0.4 bar
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