32
In case of a lockout, a warning triangle (
E
) and a flashing error code appears on the display. The cause of a fault should first
be determined and eliminated before the boiler is being reset. In case the lockout appears more than twice within 6 minutes or
maintains for longer than 6 minutes, the error code is added with a “
3
”. The table below shows all possible lockouts and an
indication of possible cause.
No. Error type
Explanation
Possible solution
1
Lockout
Water flow temperature has exceeded the high
limit temperature setting (100ºC).
Check if boiler is in automatic mode (K), Check if water
flow through the boiler is sufficient, check if (P11+P12)
< High limit setting (V9).
2
Interlock
Gas pressure has dropped below minimum value
of minimum gas pressure switch or additional
safety device connected to the interlock input has
been interrupted (during startup).
Check gas supply pressure / check function of additio-
nal safety device on interlock input.
3
Interlock
Gas pressure has dropped below minimum value
of minimum gas pressure switch or additional
safety device connected to the interlock input has
been interrupted (during operation).
Check gas supply pressure / check function of additio-
nal safety device on interlock input.
4
Lockout
No flame ionisation signal detected during burner
start.
Check phase/neutral of power supply (phase sensitivi-
ty!), check gas supply, check ignition spark, increase
gas valve setting min. load (alan key screw).
5
Lockout
Flame ionisation signal lost during operation.
Check gas supply pressure during operation, check
gas valve setting via combustion analysis.
6
Interlock
Water flow temperature has exceeded the tem-
perature limiter setting (97ºC).
Check if boiler is in automatic mode (
F
), check if water
flow through the boiler is sufficient, check if (P11+P12)
< Temp. limiter setting (V10).
7
Lockout
External safety device connected to the lockout
input has been interrupted.
Check the external safety devices (water pressure
switches, safety thermostat, etc.)
11
Lockout
Flame ionisation signal detected before burner
start.
Check ionisation electrode, measure ionisation current
when boiler is off, check wiring between ionisation
electrode and boiler controller.
12
Interlock
Water flow temperature sensor is defective.
Check resistance of sensor (see chapter “sensor
values”), check wiring between water flow temperature
sensor and boiler controller.
14
Interlock
DHW temperature sensor (optional) is defective. Check resistance of sensor (see chapter “sensor
values”), check wiring between DHW temperature
sensor and boiler controller.
15
Interlock
Outside temperature sensor (optional) is defecti-
ve.
Check resistance of sensor (see chapter “sensor
values”), check wiring between outside temperature
sensor and boiler controller.
18
Interlock
Header temperature sensor (optional) is defecti-
ve.
Check resistance of sensor (see chapter “sensor
values”), check wiring between header temperature
sensor and boiler controller.
Lockouts
