Viessmann · Boiler

F.430 Gateway communication error

Low severity Vitodens 200-W B2HE

What the control is telling you

Normal operation per boiler target values.

Applies to: Vitodens 200-W B2HE 85, 120, 150, 199

Likely causes

Gateway cable/power

Test and repair steps

Check the gateway module connecting cable and power supply.

Models that show this code

4 models in Vitodens 200-W B2HE

B2HE-120B2HE-150B2HE-199B2HE-85

Other codes on the same units

F.416 Flue gas temperature sensor mispositioned
F.417 BCU faulty
F.418 BCU faulty
F.425 Time synchronization failed
F.446 Supply sensor / high limit deviation
F.447 Ionization current signal deviation
F.448 Ionization current signal deviation
F.449 Program run monitoring error

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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.