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Common Warmhaus Boiler Problems & Repair Advice

Rob Wells
By: Rob Wells
Updated: 9th December 2021

To help you get through any Warmhaus boiler problems, we've put together this guide. You'll even find that some common boiler issues don't even require a heating engineer. If after reading this you still have the tiniest bit of doubt get in touch with an engineer. Using Boiler Guide, you can get free boiler repair quotes from approved heating engineers in your area.

Common Warmhaus boiler problems

Low boiler pressure

Without constant pressure, your boiler won't be performing to its full potential. All boilers will gradually lose efficiency over time – the pressure gauge reads less than 1 bar – but if you find that your boiler pressure has suddenly dropped there could be a leak.

How to fix low boiler pressure

Increasing boiler pressure is something you can do yourself, follow the steps in our guide to What Causes Low Boiler Pressure? but if you spot a leak, turn the water supply off and contact a Gas Safe registered engineer right away.

High pressure

Boiler pressure normally sits somewhere between 1 and 2 bars on the pressure gauge, if it's above this then your boiler pressure is too high. This is most commonly caused when a boiler has recently been re-pressurised as the valve or filling loop may still be open.

Fix high boiler pressure

You might need to hire a Gas Safe registered engineer to ensure the valve is closed but it’s also possible to reduce the pressure by bleeding your radiators.

Without heating and hot water

The first thing to do in this case is check that there's not an issue with boiler pressure or your thermostat. If you can rule both of these out then there are several possible causes such as broken diaphragms and airlocks, failure of motorised valves, issues with the thermostat or low water levels.

Strange noises

If you're hearing unfamiliar banging or gurgling noises then one of the most common causes is a build-up of sludge, rust and other debris in the system. These noises will often resemble a kettle boiling as the hot water is trapped by the blockage, boils and then steams, and is suitable known as kettling as a result.

How to fix strange noises

To clear the sludge, rust and various other bits of debris that might have built-up in your heating system, you’ll need to hire a Gas Safe registered engineer to perform a powerflush. A powerflush will clear any debris, allowing the water to circulate as normal again.

To prevent this from happening again in the future, your heating engineer might recommend installing a magnetic filter which will attract all the rust before it has chance to build-up.

Radiators not heating up

Finding that your radiator is hot towards the bottom and cold at the top, there could be too much air in the system.

How to fix radiators that aren’t heating up

You should start by bleeding your radiators but if this doesn't work, or you don't feel confident doing that, then contact an engineer.

Need a boiler repair?



Which Warmhaus boiler problems need an engineer?

We've put together the list below to help you find potential causes of some of the more common boiler problems.

Problem Possible cause Do you need an engineer?
No heating or hot water Possibly caused by several things such as broken diaphragms and airlocks, failure of motorised valves, issues with the thermostat or low water levels Yes
Dripping and leaking Most likely to be a broken internal component but it will depend where the water is leaking from Yes
Banging, whistling or gurgling noises Air in the system could be causing this, otherwise it could be that the water pressure is too low Yes
Pilot light goes out The thermocouple could be broken which is in turn stopping the gas supply Yes
Losing pressure Could be a water leak in the system, the pressure relief valve needs replacing or due to recently bleeding radiators If there’s a leak
Frozen condensate pipe You should see this displayed on your boiler as an error code or warning notification Yes
Thermostat issues Your thermostat could be turned off or isn't set to the correct settings (time etc.) Consider replacing
Kettling Limescale or sludge building up on the heat exchanger Yes
Radiators not getting hot Sludge or air building up in the system or an unequal distribution of heat Your radiators will need to be bled which doesn't require an engineer but if you don't feel like carrying out the task yourself
Boiler keeps switching itself off Could be low water pressure, a problem with the thermostat or a lack of water flow due to a closed valve, air or the pump not circulating the water in the system properly Yes

Warmhaus boiler warranty

All of the Combi boilers that Warmhaus have available come with a 2 year warranty. We've put together a complete guide to Warmhaus warranties so that you know exactly what to expect. One thing you’ll need to do to keep the warranty valid is arrange an annual Warmhaus boiler service throughout the duration of the warranty period. This will also help your boiler to last longer and run to its most efficient, keeping your energy bills as low as possible.

Boiler insurance and ongoing cover

When a boiler warranty comes to an end you might want to think about boiler insurance. If you take a look at boiler insurance, make a note of the ones offering annual services and safety inspections. Boiler insurance can be taken out with your energy supplier but there's no obligation to do so.

Is it time to replace your Warmhaus boiler?

If your Warmhaus boiler has been in your home for some years then it could be worth considering a new one as you could be making savings of up to £300* a year in a detached home. Take a look at the table below to see how much you could be saving depending on your current boiler rating and property.

House Type G (less than 70%) F (70-74%) E (74-78%) D (78-82%)
Semi-detached £195 £140 £125 £110
Detached £300 £210 £165 £135
Detached bungalow £155 £110 £100 £90
Mid-terrace £170 £120 £105 £95
Mid-floor flat £80 £55 £50 £45

How to find the best installer to replace your Warmhaus boiler

Coming to the decision that you'd like to replace your boiler means finding someone to replace your old one.

The simple part is knowing that the engineer carrying out the work must be Gas Safe registered. Ultimately though, the replacement will be carried out by a national company or a local engineer, which one is right for you?

In a lot of cases, local engineers offer extremely competitive rates for personal service where you'll be able to talk with the same person throughout.

National companies however, might tempt you as they can offer additional services such as ongoing boiler cover and you'll have big brand protection.

When deciding who to carry out the replacement, we don't recommend that you go with the first engineer you come across. It's worth getting up to 3 quotes from different engineers to find the best deal for you and your home.

Send us an enquiry today to receive free quotes for a new boiler and find trusted engineers near you with our free service.

*According to the latest figures from the Energy Saving Trust

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Rob Wells

About the author

Rob Wells

Rob is another of our resident home heating experts. He manages our external partnerships, making sure you get the most up to date information.

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