What does the Viessmann 451 fault code mean?

Your boiler's controller has lost track of its scheduled heating and hot water timings, so it may not follow your programme correctly, though it is not a safety problem.

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 050 W B0ha B0ka 6194588 installation & service manual.

DIY fix possible

Check that the date, time and programme settings on the boiler's control panel are correct and reset any that look wrong.Switch off the boiler at its power supply (the fused spur or isolator switch) for about one minute, then switch it back on. Do not touch any gas components.Watch the boiler for 15 to 20 minutes to see whether heating and hot water work as expected and the code clears. If the code returns, contact a Gas Safe registered engineer.

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Related fault codes

452View →453View →

All 131 fault codes on the Vitodens 050-W B0HA-25

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

7 8 13 14 49 50 57 58 59 62 63 64 67 68 69 70 71 72 73 74 75 77 78 87 89 95 104 142 161 163 182 183 184 299 346 347 348 349 350 351 352 353 354 355 357 359 361 364 365 366 367 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 393 394 399 400 401 402 403 404 405 406 408 410 416 417 418 425 446 447 448 449 450 452 453 454 455 456 457 458 461 462 463 464 467 468 471 474 527 528 540 574 575 576 577 578 579 682 683 684 694 738 766 767 799 979 980 981 982 E10 E12

Your boiler's controller has lost track of its scheduled heating and hot water timings, so it may not follow your programme correctly, though it is not a safety problem.

What the manual says

DIY fix possible

Avoid the next call-out bill

Related fault codes

All 131 fault codes on the Vitodens 050-W B0HA-25

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