Viessmann VITODENS 100-W Installation And Service Instructions Manual page 53

Fault messages
(cont.)
Displayed fault System characteristics
code
353 Shutdown with restart if de-
mand exists
354 Burner in a fault state
355 Burner in a fault state
357 Burner in a fault state
359 Burner in a fault state
Cause
Insufficient gas supply,
burner output reduced
Gas modulation valve tol-
erance outside permissi-
ble range
Analogue signal reference
check: Flame signal is al-
ready present at burner
start.
Insufficient gas supply
No ignition spark
Troubleshooting
Measures
Check the gas supply.
Visually check the inlet strainer in
the gas solenoid valve for dirt.
Reset the appliance.
Replace gas fan unit.
Replace the HBMU heat manage-
ment unit. See chapter "Replacing
the HBMU heat management unit".
Check that the main gas valve
■
and the gas shut-off valve are
open.
Test static gas pressure and gas
■
flow pressure.
Check that on-site gas line and
■
gas flow switch are correctly
sized.
Note
If the building pressure regulator
has a leak, you may notice rising
pressure when the burner is idle.
When the system is restarted,
the gas flow switch may trip.
If the static pressure doesn't
■
drop, check cable to the fan unit.
Check that the coil resistance at
the fuel valve is approx. 4 k
(plug 35).
Check the ignition electrode for
■
damaged insulation.
Reset the appliance.
Check whether the ignition elec-
■
trode insulation is damaged.
Check for a voltage of 230 V∼ at
■
the ignition module during the ig-
nition phase. If not, replace the
HBMU heat management unit.
If 230 V~ is present at the igni-
■
tion module but there is still a
fault, replace the ignition module.
Check connection cables and
■
leads from ignition module and
ignition electrode.
Reset the appliance.
Ω
53