Code
Cause of
the fault
Description
Checking / solution
E
:
16
SU
Detection of a parasite flame
Ionization current present even though there is no flame
Ignition transformer defective
4
Check the ionization/ignition electrode
Gas valve defect
4
Check the gas valve and replace if necessary
The burner remains very hot: O
2
too low
4
Set the O
2
E
:
17
SU
Problem on the gas valve
Bad connection
4
Check that the SU PCB is correctly in place
SU PCB faulty
4
Inspect the SU PCB and replace it if need be
E
:
34
PCU
The fan is not running at the
right speed
Bad connection
4
Check the wiring between the PCU PCB and the fan
Fan defective
4
Check for adequate draw on the chimney connection
4
Replace the fan if need be
4
Check the state of cleanliness of the exchangers
4
Check the connection direction of the flow and return pipes to the
DHW tank (if present)
E
:
35
SU/PCU
Flow and return reversed
Bad connection
4
Check that the sensor has been correctly fitted
Sensor fault
4
Check the Ohmic value of the sensors
4
Replace the sensor if necessary
Water circulation direction reversed
4
Check the circulation (direction, pump, valves)
E
:
36
SU/PCU
The flame went out more than
5 times in 24 hours while the
burner was operating
No ionization current
4
Purge the gas supply to remove air
4
Check that the gas valve is fully opened
4
Checking the gas supply pressure
4
Check the operation and setting of the gas valve unit
4
Check that the air inlet and flue gas discharge flues are not blocked
4
Check that there is no recirculation of flue gases
4
Check the state of cleanliness of the exchangers
4
Check the connection direction of the flow and return pipes to the
DHW tank (if present)
E
:
37
SU/PCU
Communication failure with the
SU PCB
Bad connection
4
Check whether the SU PCB has been correctly fitted into the
connector on the PCU PCB
4
Change the SU PCB
E
:
38
PCU
Communication failure between
the PCU and SCU PCBs
Bad connection
4
Check the wiring between the PCU and SCU PCBs
4
Perform the automatic detection function
¼
see chapter
"Carrying out an auto-detect", page 75
SCU PCB not connected or faulty
4
Replace the SCU PCB
9. Troubleshooting
CALORA TOWER GAS 15S EX CALORA TOWER GAS 25S EX
CALORA TOWER GAS 35S EX
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