Viessmann Boiler Problems & How To Fix

Sometimes dealing with Viessmann boiler problems can be a real brain drain, however, this article will go over the most typical issues and how to fix them.

Boilers made by Viessmann are renowned for their high-performance and dependable central heating systems.

This is not to say that your heating system won’t experience a typical issue such as an odd noise, or an error code.

This guide is intended to help you be ready in case any common faults occur that you might be able to fix yourself instead of waiting for a boiler repair technician. Heating systems work long and hard for a very long time.

Always make sure to contact a Gas Safe engineer as soon as possible if any problems do arise with your heating or hot water and you do not feel comfortable having a look yourself.

“Remember your annual service and adhere to the Viessmann warranty requirements within 30 days of installation to maintain the validity of your warranty.” As a result, who knows when you might need it?

Book a boiler service >

List of the most common Viessmann Boiler Problems and how to repair them:

While the majority of Viessmann boiler problems are widespread across all boilers, there are various indicators for each type. The Viessmann Vitodens 100-w and the Viessmann Vitodens 050-w combi are two of the most well-liked boilers in the UK.

If you have an old Viessmann boiler, the smarter investment would be to purchase the Viessmann Vitodens 100-w or the Viessmann Vitodens 050-w combi. This is because they are a best-seller, multi-award winning, affordable piece of boiler beauty.

Here are some of the most typical fixes for fault and error codes, which can quickly point you in the direction of a problem.

Viessmann boiler not producing hot water:

Is your heating working with no problems but you have no hot water?

If the answer is yes, there may be several causes.

Leaks, problems with the water or power supply, low pressure, and broken diverter valves are all potential causes of the issue.

• Firstly: turn on the lights and check the power supply. Check your gas and water supplies if the power source is working. Is the boiler’s temperature currently at the appropriate level? If not, check it again. Also, is the hot water switch on the control panel turned on?
• Despite this, a Gas Safe registered boiler engineer should be contacted if the problem does not solve after the above steps

 

Viessmann Boiler Problems with ignition

Does your boiler not turn on?

If the answer is yes, there may be a few faults to be found as to why this is occurring.

• There might be accumulation in the system. The burner may be blocked by dirt.
• A boiler malfunction could be brought on by the air pressure sensor.

• Firstly: if buildup in the system is preventing the burner from firing, Viessmann boilers will display the fault code “F5”. Call a Gas Safe engineer as soon as you can if this is the problem. The system will be flushed by them until it is clear.
• If the boiler engineer determines that the problem is not with the burner, they will examine the system to determine the source of the issue.

 

Viessmann Boiler Problems with leaking water:

Is water leaking from your Viessmann boiler?

If the answer is Yes, contact a Gas Safe engineer as soon as possible.

A leak is dangerous and can be expensive to solve if the issue is there for an extended period.

• Firstly: turn the boiler off.
• Contact the Gas Safe registered engineer.
• Boiler leaking water is often an internal issue, high water pressure, boiler casing could be cracked, or joints could be loose.

 

Viessmann Boiler Pressure is Low:

Is your Viessmann boiler showing pressure is low (below 1 bar)?

If the answer is yes, this could be caused by a couple of reasons. Radiators need bleeding or a water leak.

• Firstly: If you find a leak in the pipework, radiators or boiler contact a Gas Safe registered engineer as soon as possible.
• Firstly bleed your radiators – this can cause the pressure to lower.
• Secondly, if you feel confident enough to do so, you can re-pressurise your boiler by following a step-by-step guide.

Furthermore, if the above steps do not solve the low-pressure problem, contact a Gas Safe registered engineer who will check what the issue is, solve the problem, and ensure the boiler is safe for you.

Viessmann Frozen Condensate Pipes:

Is your Viessmann gas boiler not working when the weather goes cold?

Is there no heating, hot water and a Gurgling noise?

If the answer is yes, this could be a simple issue for your to solve.

• UPCOMING STEP: The condensate pipe may freeze as a result of the bitterly cold winter months. The display may show the error code “F4” depending on the type of boiler you have.
• It is easy to locate the condensate pipe because it is the only plastic pipe connected to the boiler.
• Over the frozen pipe segment, apply TEPID water. Start at the top of the pipe because it is completely frozen, this will allow any water that has been clogged elsewhere in the pipe to eventually escape. Pour hot water on any areas that are flat or have elbows after this (don’t use boiling water), as these are known to freeze more quickly.
• You could try using a heat source if this does not melt the ice inside.
• Use a hot water bottle or hot towel instead if this does not melt the ice inside. This will give the frozen area continuous heat for a longer period of time.
• Hopefully, water will now start to leak from the pipe or you will hear a new sound called “trickling.”
• Resetting the boiler is the next step; if you are successful, the error code will vanish.
• By recycling the gas and converting it to heat, the condensing pipe prevents waste gas from leaving the boiler.
• Finally, if all else fails contact a Gas Safe registered engineer.

 

If you would like a boiler quote or any information click here