Five Most Common Vaillant Boiler Problems and Repairs

By Myles Robinson

Posted on 23rd June 2020

Updated on 26th May 2021

Five Most Common Vaillant Boiler Problems and Repairs

We all do our boiler research before purchasing the correct central heating system for our home so that we won’t tell you all about Valliant. Five Most Common Vaillant Boiler Problems and Repairs Compare Boiler Quotes

Yes, Vaillant is well known for reliability, but the same with everything problems can occur.

The guide below has the five most common problems and how to deal with them.

The Boiler Keeps Turning Off:

Boiler keeps turning off, and you don’t know why?

This could be due to a lack of water flow power, low water pressure, or a problem with the thermostat. Five Most Common Vaillant Boiler Problems and Repairs Compare Boiler Quotes

NEXT STEP: Firstly, Read the Vaillant boiler manual to see what the pressure should be and what your boiler is showing.
Secondly, check the thermostat is working; if it isn’t working, contact, a Gas Safe registered engineer.
Thirdly, try bleeding your radiators to see if the air which is trapped is causing the problem.
If non of the above don’t seem to be an issue or you are not confident enough to check yourself, always call a Gas Safe registered engineer as soon as possible.

Bleed Your Radiators:

Is the top part of your radiator cool to touch?

Is the bottom of the radiator warm like how you would expect it all to feel? Five Most Common Vaillant Boiler Problems and Repairs Compare Boiler Quotes

The cold part means there is air trapped inside the radiator, which has risen to the top of the radiator, stopping the hot water from reaching the top.

Follow the step by step guide on how to bleed a radiator. If this does not fix the problem, contact a Gas Safe registered engineer.

Ensure the central heating is turned on.
Check all the radiators around the home to see if they feel the same.
Turn the central heating off
Have a drink while you wait for the radiators to cool down fully.
Have your tools to hand.
Find the valve which you need to bleed.
Slowly loosen the screw, which you need to bleed.
Wait for the sound of hissing to entirely go away.
Slowly start to tighten the valve and clean up the water drips.
Turn the central heating back on.

Water Pressure is Low than it should be:

Vaillant’s problem, which happens the most is Low Pressure.

This is a problem you can mend by yourself unless the water is also leaking. If there is a leak contact, a Gas Safe registered engineer as soon as possible. Five Most Common Vaillant Boiler Problems and Repairs Compare Boiler Quotes

Vaillant will show the code F22 on the display if this is the issue.

NEXT STEP: Firstly, check if the leak is from the boiler or the radiators.
Secondly, no leak means you can follow the manual to re-pressurise your heating system. Make sure you turn the heating off beforehand and let it cool.
If the above does not solve the problem, contact the heating engineer.

Frozen Condensate Pipe:

Wondering why your heating and hot water is not working now the cold months have appeared? Is there a strange gurgling noise?

This means you have a Frozen condensate pipe that you can fix yourself. Five Most Common Vaillant Boiler Problems and Repairs Compare Boiler Quotes

NEXTSTEP: Firstly, use some Tepid water (not boiled) then find the pipe, once you have found the pipe pour the water on the frozen section. Once the ice has thawed, go and restart your boiler.
If the above does not solve the problem, contact the Gas Safe heating engineer.

Boiler Will Not Ignite:

If the fault code F28 shows on the display or your boiler will not fire up, the condensate pipe could be frozen, or there could be an issue with the ignition lead. Another reason could be the gas supply, test the other gas appliances in your home. Five Most Common Vaillant Boiler Problems and Repairs Compare Boiler Quotes

NEXTSTEP: Check other gas appliances. No gas, call the gas supplier.
Check the condensate pipe, if frozen do the above steps.
If the pipe isn’t frozen and the gas supply is working, you need to contact your Gas Safe registered engineer as soon as possible.

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