Baxi LUNA DUO-TEC 1.70 User Manual page 13

E14 5 burner start-up failures
E16 False flame signal
E17
Problem on the SU PCB
E34 Fan fault
E35 Supply and return reversed
Flame loss
E36
Communication error with the
E37
SU PCB
Communication error with the
E38
SCU PCB
Shutdown input in locked-out
E39
mode
No water temperature change
E41
during the deaeration/air purge
Low water cutoff disconnected
E42
or water pressure too low
No water temperature change
during boiler operation (burner
E43
on)
Difference between supply/
E44
return temperature too high
No ignition
Presence of spark but no flame
formation
Presence of the flame but insufficient
ionization (<3 μA)
Ionization current present when there
should not be a flame
Ignition transformer defective
Gas valve defective
The burner remains very hot: CO
Bad connection
Defective SU PCB
Bad connection
Fan defective
Bad connection
Sensor fault
Sensor not/poorly connected
Water circulation direction reversed
No ionization current
Bad connection
Bad connection
Defective SCU PCB
Bad connection
External problem
Parameter incorrectly set
Bad connection
Supply/Return sensor damaged
No water circulation
Bad connection
Water pressure low
Bad connection
Supply/Return sensor damaged
No water circulation
Bad connection
Supply/Return sensor damaged
No water circulation
13
Check spark generator wiring
Check the ionization/ignition electrode
Check the condition of the burner
Check the grounding
Defective control SU PCB
Purge the gas supply to remove air
Check that the gas valve is fully opened
Check the gas supply pressure
Check the operation and setting of the gas valve
Check that the air inlet and exhaust flue are not
blocked
Check the wiring on the gas valve
Defective control SU PCB
Check that the gas valve is fully opened
Check the supply pressure
Check the ionization/ignition electrode
Check the grounding
Check the wiring on the ionization/ignition electrode
Check the ionization/ignition electrode Check
the gas valve and replace if necessary
Recalibrate the CO2
too high
2
Check the wiring
Inspect the SU PCB and replace it if need be
Check the wiring
Replace the fan if need be
Check for adequate draw on the flue connection
Replace the sensor if necessary
Check for water circulation (direction, pump, valves)
Check that the sensors are operating correctly
Check that the sensors have been correctly fitted
Purge the gas supply to remove air
Check that the gas valve is fully opened
Check the supply pressure
Check the operation and setting of the gas valve
Check that the air inlet and exhaust flue are not
blocked
Check that there is no recirculation of flue gases
Check whether the SU PCB has been correctly fitted in
the connector on PCU PCB
Check the wiring
Replace SCU PCB
Check the wiring
Find external problem
Check the parameters
Check the sensor connection
Replace the sensor
Check the pump connection
Check the wiring
Refill the system
Check for leak
Check the sensor connection
Replace the sensor
Check the pump connection
Check the sensor connection
Replace the sensor
Check the pump connection
7703476.01 (1-03/18)