HVACopediaViessmann · Boiler
F.357 Insufficient gas supply
What the control is telling you
Burner in a fault state.
Applies to: Vitodens 200-W B2HE 85, 120, 150, 199
Likely causes
- Closed gas valve
- Dirty inlet screen
- Undersized gas line
- Leaking house regulator
- Damaged ignition electrode insulation
Test and repair steps
- Check the gas shut-off valve is open.
- Inspect the gas valve inlet screen.
- Test static and flow pressure; verify gas line size.
- If static pressure keeps rising at idle, suspect the building regulator; check cable to fan unit.
- Check fuel valve coil resistance about 4 kOhm (plug 35, contacts 2 and 4).
- Check ignition electrode insulation.
- Reset the appliance.
Models that show this code
4 models in Vitodens 200-W B2HE
Other codes on the same units
- F.352 CO limit inside appliance exceeded
- F.353 Insufficient gas supply, output reduced
- F.354 Gas modulation valve tolerance outside range
- F.355 Analogue signal reference check: flame signal at start
- F.359 No ignition spark
- F.361 No or weak flame signal at burner start
- F.366 Gas valve supply does not switch off
- F.367 Gas valve supply does not switch off
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Source: Viessmann Vitodens 200-W B2HE 85/120/150/199 Service Instructions 6167 813-24 (09/2026), Fault messages, p.62-73. Summarized in our own words; check the original manual for your model.
Homeowner looking at this code? See what it means for you and when to call a technician.
For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.