Function Sequence And Possible Faults - Viessmann VITODENS 200-W Installation And Service Instructions For Contractors

Commissioning, inspection, maintenance
Checking the static pressure and supply pressure
Supply pressure (flow pressure)
For natural gas
H E, E+, M
Below 13 mbar Below
(1.3 kPa) 17 mbar
(1.7 kPa)
13 to 33 mbar 17 to 33 mbar
(1.3 to (1.7 to
3.3 kPa) 3.3 kPa)
Above 33 mbar Above
(3.3 kPa) 33 mbar
(3.3 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
48
L, LL, S, K Lw
Below Below
18 mbar 16 mbar
(1.8 kPa) (1.6 kPa)
18 to 33 mbar 16 to 33 mbar
(1.8 to (1.6 to
3.3 kPa) 3.3 kPa)
Above Above
33 mbar 33 mbar
(3.3 kPa) (3.3 kPa)
Display
No
No Fault F.59, F.457
No Fault F.359
No
Fault F.357
No Fault F.369, F.380
(cont.)
Measures
For LPG
Below Do not start the boiler. Notify
25 mbar your gas supply utility or LPG
(2.5 kPa) supplier.
25 to Start the boiler.
57.5 mbar
(2.5 to
5.75 kPa)
Above Install a separate gas pressure
57.5 mbar governor upstream of the sys-
(5.75 kPa) tem. Set the pre-charge pres-
sure to 20 mbar (2.0 kPa) for
natural gas and 50 mbar
(5.0 kPa) for LPG. Notify your
gas supply utility or LPG suppli-
er.
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.