Medium
bE on Viessmann Vitodens 200-W B2KA-30

The boiler has lost its connection to the thermostat that controls one of your heating zones, so that zone may not be heating to the temperature you set, while the rest of your heating and hot water should keep working.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

What the manual says

Manufacturer manual

Communication error, remote control Vitotrol heating circuit 3 circuit (with mixer)

From this model's manual
Verified against the Viessmann/Viessmann Vitodens 200 W B2ha B2ka 5772909 installation & service manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

DIY fix possible

Check the batteries in the wireless room thermostat (Vitotrol) and replace them if they are low.Make sure the thermostat is within range of the boiler and that nothing large or metal is blocking the signal.Switch the boiler off at its on/off switch, wait 2 minutes, switch it back on, and see whether the code clears.If the code returns, or the thermostat is wired rather than wireless, book a Gas Safe registered engineer rather than opening the boiler or disturbing the wiring.

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Related fault codes

All 83 fault codes on the Vitodens 200-W B2KA-30

Seeing a different code? Every code this model can display, in one place.

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