Viessmann · Boiler

F.416 Flue gas temperature sensor mispositioned

High severity Vitodens 200-W B2HE

What the control is telling you

Burner locked out.

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

Likely causes

Sensor not seated correctly

Test and repair steps

Seat the flue gas temperature sensor correctly (see Repairs).
Perform a mains reset after the fix.

Models that show this code

4 models in Vitodens 200-W B2HE

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

Other codes on the same units

F.405 IO electrode ground fault
F.406 BCU faulty
F.408 BCU faulty
F.410 BCU faulty
F.417 BCU faulty
F.418 BCU faulty
F.425 Time synchronization failed
F.430 Gateway communication 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.