Problem

This fault could be caused by the air locks, pump or wiring and usually relates to an issue with installation. It could also be caused by a lack of water in the system or poor water circulation.

Solution

As this isn’t a boiler issue but an installation issue, repressuring the boiler can sometimes help. If not, it’s best to call a professional boiler installer to take a further look.

Problem

This fault occurs when there’s not enough water in the steam and the pressure becomes low.

Solution

This issue is usually solved by topping up the water pressure using the filling loop.

Problem

This usually means the flame has gone out during operation which could be caused by incorrect gas pressure, a flue issue, a gas valve fault, a fan fault or an incorrect adjustment of a valve.

Solution

This is a fault most commonly found with older boilers and systems that are not efficient. You can try resetting the boiler and checking other gas appliances. You may need to invest in a new boiler.

Problem

This is caused by a loose or damaged fan, which may be related to a more complex issue. There may be damaged connections, damage from a boiler leak, air pressure faults or a printer circuit board issue.

Solution

A qualified engineer will be needed to solve this problem, as there are a wide range of causes and solutions.

Problem

This shows a problem with the flow thermistor or its operation, and it can lead to issues with circulation.

Solution

A Gas Safe registered engineer will be needed to solve this problem.

Problem

This signifies a fault with the return thermistor or its operation. It usually relates to a faulty NTC return thermistor, a damaged connection, a differential temperature that’s too high or a faulty printed circuit board.

Solution

A Gas Safe registered engineer will be needed to solve this problem.

Problem

This shows the outside sensor on the system is broken or faulty and it may relate to the printed circuit board.

Solution

This can be related to a fault with the weather compensator installation, so it’s worth checking. If you don’t have a weather compensator, an engineer will be able to diagnose the problem.

Problem

This could mean an issue with the mains electricity source, if it’s dropped below 190vac, and the boiler will stop working until the fault is resolved.

Solution

This is not a boiler fault, but a boiler installer may be able to help.

Problem

This usually relates to an unconfigured printed circuit board.

Solution

Solving this issue can be costly and often a brand new boiler is a better option.

Problem

If the resistant reading temperature is reading too low or too high, the boiler will stop working to ensure safety.

Solution

Resetting the boiler can help, but if not you should contact a qualified engineer. It’s usually older and less efficient boilers than have problems with overheating.

Problem

This means the boiler has locked itself as a matter of safety, which can be caused by a variety of things.

Solution

Resetting the boiler may solve the fault. If there’s a rumbling noise coming from the system, the condensate pipe is blocked. There could also be an issue with the flue, both of which require a qualified engineer to fix.

Problem

This means that the printed circuit board has been changed and the wrong boiler chip card has been used.

Solution

A qualified engineer is needed to fix this problem.

Problem

This could mean that the temperature on the resistance reading is too high.

Solution

Check the pressure reading on the system and bleed the radiators. If this does not work, contact a Gas Safe engineer as overheating is often a sign of a more complex problem.

Problem

This means the boiler has locked itself as a matter of safety, which can be caused by a variety of things.

Solution

Check to see if other gas appliances in the property are still working, if they are then reset the boiler. If there’s a rumbling noise coming from the boiler, the condensate pipe could be blocked.

Problem

This could be due to someone resetting the boiler five times within a 15 minute period.

Solution

Turn off power to the boiler at the fuse spur, then turn it back on again. Contact a Gas Safe engineer if the problem continues.

Problem

This happens when the flame appears before the gas comes on.

Solution

Reset the boiler. If the problem persists and the system is covered by a warranty, contact the manufacturer.

Problem

The boiler chip card has an internal error.

Solution

Reset the boiler. If this does not solve the problem, contact an engineer.

Problem

If the hot water is still working, the boiler could be experiencing a pump overrun due to poor heating circulation.

Solution

Contact a qualified engineer, the thermostat and the radiators will need to be checked.

Problem

There is an issue with the printed circuit board.

Solution

Turn the power off by the fuse spur and turn it back on again. If the problem continues, contact an engineer.

Problem

Kettling is a common issue and a humming/rattling noise could include a number of problems, such as loose components or high pressure.

Solution

Check the central heating system for loose components and try repressurising the boiler. If the problem continues, contact an engineer.

Problem

This could indicate a problem with the condensate pipe, gas or flue.

Solution

Contact a Gas Safe registered engineer.

Problem

If the heating is working but there’s no hot water, or a lack of hot water, it’s not usually a fault with the boiler.

Solution

Contact a Gas Safe registered engineer.

Problem

If the hot water is working but there’s no heating, or poor healing, it’s usually an issue with the radiators.

Solution

Contact a Gas Safe registered engineer.

Problem

This could be due to an inefficient boiler or using the heating incorrectly.

Solution

Check the boiler’s efficiency rating. It may be worthwhile to invest in a new boiler.

Problem

This usually means water is escaping somewhere in the system or it could be due to the expansion valve failing.

Solution

Try to repressurise the boiler, but if not contact a Gas Safe registered engineer.