20
Display
Error type
Description
Case #
L-20
Flame error
Flame detected after
closing the gas valve
15
L-21
Flame error
Flame detected after
closing the gas valve
16
L-22
Flame error
Flame failure during
burning
5
L-25
Sensor error
Heat exchange sensor
failure
4
L-26
Sensor error
Flue sensor failure
4
L-27 to 31 Internal error
Internal error
13
L-32
Sensor error
Heat exchange sensor
failure
4
L-33 to 38 Internal error
Internal error
13
L-42
Flue temperature
error
Too many flue temperature
errors
3
L-43
Overheating
Heat exchange sensor is
overheated too often
3
9.2 Temporary errors
The table below describes the temporary errors that can
occur. These will disappear automatically after the cause
has been resolved.
Display
Error type
Description
Case #
E-00 to 04
Internal error
Internal error
13
E-05
Overheating
Heat exchange sensor is
overheated
3
E-06 to 13
Internal error
Internal error
Flame detected when there
shouldn’t be one
13
E-14
Flame error
16
E-15 to 20
Internal error
Internal error
13
E-21 and 22
Heat exchanger
sensor error
Heat exchanger sensor not
detected
4
E-23 and 24
Flue sensor error Flue sensor not detected
4
E-27 and 28
Heat exchanger
sensor error
Heat exchanger sensor
short-circuit
4
E-30 and 31
Flue sensor error Flue sensor short-circuit
4
E-34
Reset button
error
Too many reset actions in a
short timespan
9
E-36
Overheating
Heat exchange sensor is
overheated
3
E-38 and 39
Heat exchanger
sensor error
Heat exchanger sensor not
detected
4
E-47 and 48
Heat exchanger
sensor error
Heat exchange sensor
short-circuit
4
E-49 to 64
Internal error
Internal error
13
E-65
Voltage too low
Supply voltage is too low
for over 1 minute
E-66
Voltage too high Supply voltage is too high
for over 1 minute
E-67
Pressure switch
error
Too many pressure switch
errors
11
E-68
Flue temperature
error
Flue sensor is overheated
3
E-69
Configuration
error
Heater configuration error 19
9.3 Warnings
The table below describes the temporary warnings that
can occur. The heater may still be working, or stops until
the cause has been resolved.
Display
Error type
Description
Case #
A-02
Configuration
error
Heater configuration error
19
A-07
Overheating
Heat exchange sensor is
almost overheated
3
A-08
Overheating
Flue sensor is almost
overheated
3
9.4 Instructions
After identifying the problem, use the Case number to find
the possible cause in this paragraph.
Case 1:
Flame lasts only 5 seconds after ignition.
• The flame is not detected:
–
Check the ignition/ionisation cable and the
electrode. The cable should have a resistance
of 1 kΩ.
• The air heater is not earthed properly.
• The circuit board is defective.
Case 2:
No flame after ignition.
• There is not enough gas pressure.
• The gas mixture is too poor:
–
Adjust the gas valve (see §8.1).
• The gas valve does not open:
–
During ignition, check for a 230 V voltage on
the valve.
• Check if the ignition electrode sparks. If not:
–
Check the cable and electrode and replace
them when damaged.
–
Check the burner control unit and replace it
when it does not give a spark output.
Case 3:
Heat exchange sensor or flue sensor is overheated.
• Check if the connectors J12 and J6 are plugged in
correctly and if the connection J12[1-4] (optional
overheating protection) is closed.
• Check if the system fan supplies enough air.
• Check the settings of the gas valve. The heater may
be overfired. If so:
–
Adjust the burner pressure.
Case 4:
Heat exchange sensor or flue sensor not detected,
or short circuit.
NOTICE
L-25 refers to the heat exchange sensor. L-26
refers to the flue sensor, if applicable.
