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Common Johnson & Starley Boiler Problems & Repair Advice

Rob Wells
By: Rob Wells
Updated: 27th March 2024

This handy guide to some of the common Johnson & Starley boiler problems and repair advice will help you to get your boiler back up and running again in no time. If you need the expertise of a Gas Safe registered engineer, and if in doubt always get in touch with one, you can get free boiler repair quotes using Boiler Guide.

Common Johnson and Starley boiler problems

Johnson & Starley boiler problems Error code
No heating or hot water 1, 34, E01
Leaking or dripping F37
Radiators not heating up E01
Low boiler pressure F37
Boiler turning off 1, E01, E05, E34

No heating or hot water

If your home is without heating and hot water, this is likely to be caused by broken diaphragms or airlocks, failure of motorised valves, issues with the thermostat or low water levels. Check that there isn't an issue with the boiler pressure or your thermostat and if there's nothing wrong, get in touch with a Gas Safe registered engineer.

Leaking or dripping

We'll start off by saying that you should never try to repair a leak yourself, always contact an engineer. The cause will depend on where this leak is coming from but the most common causes are a broken internal component, such as a pump seal or pressure valve.

Radiators not heating up

There can be a number of reasons why your radiators aren't getting hot or that only the bottom section is heating up. The two most common causes are sludge or air in the system and unequal distribution of heat. When just the bottom of your radiator is getting hot, you may need to bleed it. Follow our guide to bleeding radiators for a walk through of the process.

Low boiler pressure

It's important to check your boiler for low pressure as it can lead to your central heating system not functioning properly. It's easy to do by simply taking a look at the pressure gauge, if it's below 1 you may have an issue. Find out more with our guide to low boiler pressure.

Boiler keeps turning off

Possible causes are 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. If you can't identify the cause, call out a Gas Safe registered engineer to take a look at your boiler.

Which Johnson and Starley boiler issues need an engineer?

While boilers are mostly quiet and reliable, they can encounter some common problems that can be identified and repaired yourself in some case. Take a look at the table to know when you should be contacting an engineer, and if in doubt always contact one.

Need a boiler repair?



Problem Possible cause Do you need an engineer?
No heat or hot water Broken diaphragms and airlocks, failure of motorised valves, issues with the thermostat or low water levels Yes
Leaking and dripping Most common cause is a broken internal component but it will depend where the water is leaking from Yes
Banging, whistling or gurgling noises A common cause is air in the system, alternatively it could be that the water pressure is too low or it's kettling Yes
Pilot light goes out Could be a broken thermocouple which is 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 No, unless there’s a leak
Frozen condensate pipe Your boiler will often display a fault code or warning notification Yes
Thermostat issues Thermostat may be turned off or not set to the correct settings (time etc.) Consider replacing
Kettling Limescale or sludge building up on your boiler's heat exchanger Yes
Radiators not getting hot Sludge or air build up in the system or an unequal distribution of heat You will need to bleed the radiators which doesn't require an engineer unless 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

Johnson and Starley boiler warranty

Depending on which model you decide to go for, the standard warranty will vary from 1-5 years. Take a look through our guide to Johnson & Starley warranties for more information.

Ensure the safe and efficient running of your new boiler, as well as keeping the warranty valid by arranging an annual Johnson & Starley boiler service.

Boiler insurance and ongoing cover

Once your warranty has expired, you might want to consider taking out boiler insurance. This can be taken out with your energy supplier but there's no obligation to do so. When comparing insurance, keep an eye out for the ones offering an annual service and safety inspection.

Is it time to replace your Johnson and Starley boiler?

If you've had your Johnson & Starley boiler for quite a while, then it's worth considering a new one as you could be saving 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

Finding a heating engineer to replace a Johnson and Starley boiler

If you like the sound of a new boiler, then the next big decision is choosing who to replace your current one. The easy part is knowing that no matter who you get to replace a boiler they must be Gas Safe registered but your choice ultimately comes down to a local engineer or a national company.

Local engineers often have very competitive rates and are often just one man and his van so you'll get a very personal service throughout your communications. We recommend getting a quote from more than 1 engineer to make sure you're getting the best deal, we suggest up to 3.

National companies might be slightly more on the expensive side but you'll have big brand protection, which is a great bonus and they can provide extra service such as ongoing boiler cover.

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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