What does the Viessmann 451 fault code mean?

The boiler's control panel has lost track of its heating schedule, so it may not switch on and off at the times you have set, though it can often keep running as normal.

How much does it cost to fix Viessmann error code 451?

Typical repair cost for the Viessmann 451 fault is £80-180 including labour.

Viessmann 451 Fault Code: What It Means & How to Fix It

What the manual says

Manufacturer manual

Error in scheduled program run monitoring

From this model's manual

Verified against the Viessmann/Viessmann Vitodens 100 W B1hf B1kf 6167586 installation & service manual.

DIY fix possible

Check the date and time shown on the boiler's control panel and correct them if they are wrong.Check that your heating and hot water timer settings are still in place, and set them again if needed.Switch the boiler off at its on/off switch, wait about 30 seconds, then switch it back on.If the code is still showing, press the reset button on the control panel as described in your user manual, then check whether the code returns after a few hours.

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Related fault codes

450View →452View →

All 151 fault codes on the Vitodens 100-W B1KF-30

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

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The boiler's control panel has lost track of its heating schedule, so it may not switch on and off at the times you have set, though it can often keep running as normal.

What the manual says

DIY fix possible

Avoid the next call-out bill

Related fault codes

All 151 fault codes on the Vitodens 100-W B1KF-30

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