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Commissioning, inspection, maintenance
Checking the static pressure and supply pressure
Supply pressure (flow pressure)
For natural gas
< 20 mbar (2.0 kPa)
20 - 25 mbar (2.0 -
2.5 kPa)
> 25 mbar (2.5 kPa)
Function sequence and possible faults
Control unit issues a heat
demand
Yes
Fan starts
Yes
Ignition
Yes
Gas train opens
Yes
Ionisation current builds
Yes
Burner in operation
40
For LPG
< 50 mbar (5.0 kPa)
50 - 57.5 mbar (5.0 -
5.75 kPa)
> 57.5 mbar (5.75 kPa)
Display
No
No
Fault F.59, F.457
No
Fault F.359
No
Fault F.357
No
Fault F.369, F.380
No
Shuts down below the set
boiler water temperature and
restarts immediately.
(cont.)
Measures
Do not start the boiler. Notify the gas supply utility or
LPG supplier.
Start the boiler.
Install a separate gas pressure governor upstream of
the system. Set the pre-charge pressure to 20 mbar
(2.0 kPa) for natural gas and 50 mbar (5.0 kPa) for
LPG. Notify the gas supply utility or LPG supplier.
Measure
Increase set value. Ensure
heat transfer.
Check connection cables on
fan. Check power supply on
fan.
Check ignition module (con-
trol voltage 230 V across
plugs "X18.1" and "X18.3" on
the burner control units).
Check the gas supply.
Check the gas supply pres-
sure.
Check distance of ionisation
electrode on burner gauze
assembly.
Purge the gas line.
Check the flue system for
tightness (flue gas recircula-
tion). Check gas flow pres-
sure.
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