Viessmann VITOCROSSAL 300 User Manual (English)

Other manuals for Viessmann VITOCROSSAL 300

Operating Instructions44 pages

Service Manual108 pages

Installation Instructions56 pages

Technical Data Manual32 pages

Service Instructions For Contractors148 pages

Quick Start Guide4 pages

Service Instructions164 pages

Questions and Answers:

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Thomas WatsonAug 23, 2025
How to fix a Viessmann VITOCROSSAL 300 Boiler when the burner doesn't start?
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  Joseph TaylorAug 23, 2025
  If the burner on your Viessmann Boiler doesn't start, it could be due to several reasons. First, the gas supply pressure might be too low, causing the gas pressure switch to turn off; in this case, you should check the gas flow pressure and the gas pressure switch. Another potential cause is a lack of gas; if this is the case, notify your gas supply utility. Also, the parameter memory stick might not be correctly plugged in or could be faulty; check the parameter memory stick or replace it. Finally, the connected display might be invalid; try using a current display.
M
Melissa MccormickSep 2, 2025
Why is my Viessmann Boiler showing fault code 38?
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  Dana RamirezSep 2, 2025
  If your Viessmann Boiler displays fault code 38, it indicates a lead break in the boiler water temperature sensor. You should check the boiler water temperature sensor.
R
Robert DorseySep 1, 2025
What does fault code 30 mean on a Viessmann VITOCROSSAL 300 and how to fix it?
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  newmanemilySep 1, 2025
  If your Viessmann Boiler displays fault code 30, it indicates a short circuit in the boiler water temperature sensor. You should check the boiler water temperature sensor.
A
Ashley WilsonAug 31, 2025
What does fault code 18 mean on my Viessmann Boiler?
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  Rebekah LiuAug 31, 2025
  If your Viessmann Boiler displays fault code 18, it means there's a lead break in the outside temperature sensor. You should check the outside temperature sensor.
K
Kayla HillAug 30, 2025
How to troubleshoot fault code 10 on a Viessmann Boiler?
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  Ronald LopezAug 30, 2025
  If your Viessmann Boiler displays fault code 10, this indicates a short circuit in the outside temperature sensor. You should check the outside temperature sensor.
J
Jaclyn MoralesAug 29, 2025
What to do if my Viessmann VITOCROSSAL 300 Boiler displays fault code 9E?
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  Shane Bautista DDSAug 29, 2025
  If your Viessmann Boiler displays fault code 9E, it indicates there's no flow rate, the flow rate is too low in the collector circuit, or the temperature limiter has responded. To resolve this, check the solar circuit and solar circuit pump. Then, acknowledge the fault message.
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ann83Aug 27, 2025
Viessmann VITOCROSSAL 300 fan not running: what could be the cause?
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  jennifer89Aug 27, 2025
  If the fan in your Viessmann Boiler is not running, it could be that the fan is faulty, or the cables are faulty or broken. Check the cables and replace the fan if required.
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Mrs. Mariah Wilson MDAug 27, 2025
How to reset the on hold program on a Viessmann Boiler?
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  Michael MorganAug 27, 2025
  If your Viessmann Boiler is in the on hold program, it could be due to a lack of gas at the VPS gas pressure switch or because the safety chain is not closed. Reset it by holding down the reset button until '9' flashes.
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Teresa RomeroAug 25, 2025
Why does the air pressure switch switch off during operation in my Viessmann Boiler?
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  mwheelerAug 26, 2025
  If the air pressure switch switches off during operation in your Viessmann Boiler, it might be due to flue gas back pressure or backed-up condensate. Remove the flue gas back pressure, check for backed-up condensate, and reset the burner control unit.
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Lori LawsonAug 25, 2025
What to do if the gas pressure switch reports no gas pressure in my Viessmann VITOCROSSAL 300 Boiler?
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  lisa59Aug 25, 2025
  If the gas pressure switch in your Viessmann Boiler reports no gas pressure, the gas shut-off valve may be closed or the gas pressure switch may be faulty. Open the gas shut-off valve and check the gas flow pressure. If necessary, clean the gas filter.

Viessmann VITOCROSSAL 300 Specifications

General

Model	VITOCROSSAL 300
Category	Boiler
Boiler type	Condensing Boiler
Heat Exchanger Material	Stainless Steel
Warranty	2 years
Efficiency	Up to 98%
Control	Vitotronic control system
Fuel Type	Natural Gas
Standard efficiency	98%