What does the Viessmann bC fault code mean?

The boiler has lost contact with its room thermostat or heating controller for the main heating zone, so it may not be following your temperature settings properly, though it can often still run.

How much does it cost to fix Viessmann error code bC?

Typical repair cost for the Viessmann bC fault is £120-250 including labour.

Viessmann bC Fault Code: What It Means & How to Fix It

What the manual says

Manufacturer manual

Communication error, remote control Vitotrol heating circuit 1 (without mixer)

From this model's manual

Verified against the Viessmann/Viessmann Vitodens 200 W B2ha B2ka 5772909 installation & service manual.

DIY fix possible

Check that the room controller (Vitotrol) display is switched on and, if it is battery-powered, replace the batteries.Make sure the controller's cable or wireless connection is secure, then switch the boiler off at its isolator or fused spur for 30 seconds and back on.Wait about 10 minutes, then check whether the code has cleared. If it returns, call a Gas Safe registered engineer and do not open the boiler casing yourself.

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Boiler cover options

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Related fault codes

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All 83 fault codes on the Vitodens 200-W B2HA-35

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

4C 9A 9b 9C 9E 9F 10 18 19 20 28 30 38 40 44 48 50 51 58 59 90 91 92 93 94 98 99 A3 A7 b0 b1 b5 b7 b8 bA bb bd bE bF C1 C2 C3 C4 C5 C6 C7 C8 Cd CF d6 d7 d8 dA db dC dd dE dF E0 E1 E3 E4 E5 E7 E8 EA Eb EC Ed EE EF F0 F1 F2 F3 F8 F9 FA FC Fd FE FF

The boiler has lost contact with its room thermostat or heating controller for the main heating zone, so it may not be following your temperature settings properly, though it can often still run.

What the manual says

DIY fix possible

Avoid the next call-out bill

Related fault codes

All 83 fault codes on the Vitodens 200-W B2HA-35

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