All Heating One

Call us on:
0800 0314 395

Office 3, 21 Underwood Road
Paisley PA3 1TH


Because your boiler is the heart of your house, it’s critical that it runs well for as long as possible.

Is the sound of your combi boiler vibrating? Or are you dealing with a faulty boiler? All heating one is here to assist you to figure out what’s wrong with your boiler and get your central heating system back up and running as soon as possible.

We’ve included some of the most frequent boiler problems, along with their likely causes and solutions:

1. The pilot light continues to go out.

On your boiler, the pilot light is the little gas flame that is always lit.

What you can do to help

Make sure all your other gas appliances are functioning. Contact your gas supplier if they aren’t. If your gas supply is fine, try relighting the pilot light by following the instructions in your boiler’s owner’s manual. You can generally locate the instructions on the boiler manufacturer’s website if you’ve misplaced them. Because newer boilers do not have pilot lights and instead ignite electrically, this problem is more frequent with older boilers. If the problem with your pilot light persists, it may be time to consider replacing your boiler.

2. The boiler is producing strange noises (gurgling, whistling, or banging)

The most common reason for vibrating, pounding, gurgling, or whistling noises from your boiler is air in the system.

What you can do to help

If your boiler is buzzing or vibrating, examine the settings or the connections. The noise might be a sign of a more serious problem, so contact your supplier if you’re not sure.

If your pipes are gurgling, bleeding your radiators may assist. A frozen condensate pipe, on the other hand, can make a similar noise (see number nine below).

The expansion and contraction of your heating pipes might create knocking. This is common, but it’s worth double-checking that the pipes aren’t too securely fastened to the floors or joists.

3. There is no heat or hot water.

Your boiler is an important component of your house, and you should be able to rely on it to keep your home warm and deliver hot water. There are a variety of possible explanations for this problem, many of which will require the replacement of a component.

What you can do to help

Although there isn’t generally a single cause for your boiler’s failure to deliver heat or hot water, you should check to see if there are any problems with the boiler pressure or thermostat. Call a professional to repair your boiler 

4. The boiler has a leak.

Depending on where the leak or drip is originating from, the causes might vary. A faulty component, such as a seal or valve, might cause a leaky system. Corrosion might possibly be the cause.

What you can do to help

To get your boiler repaired, contact an engineer. Never attempt to repair a broken boiler on your own.

5. Inadequate boiler pressure

If the pressure gauge on your boiler readings is less than one, you may have a problem.

What you can do to help

Examine the system for any leaks. If you discover a leak, contact an engineer right once to get your boiler repaired.

If there are no leaks, you can try to re-pressurize the system by carefully following the instructions provided by the boiler manufacturer. If the problem persists, you should contact an engineer since it’s likely that a component in the system has failed.

6. Radiators are ice cold.

If your radiators are only partially heated or just some of them are operating, the most likely cause is air in the central heating system.

What you can do to help

Radiators must be bled. If the problem persists, the system may require flushing, which should be done by a skilled central heating specialist.

7. The water in the boiler is kettling.

A build-up of sludge or scaly material is likely impeding the water flow in your boiler, making it sound like a boiling kettle. This is a prevalent issue in locations with hard water.

What you can do to help

Get your system professionally cleansed by contacting a qualified professional engineer.

8. The boiler is not reacting to the thermostat.

A broken thermostat can occasionally cause issues in a system that is otherwise in good working order.

What you can do to help

Check the temperature on your thermostat. An unexpected knock can sometimes turn off or adjust the thermostat’s settings. If your thermostat settings appear to be OK but the temperature isn’t, it may be time to replace it.

9. Frozen condensate pipe 

When the condensate pipe in your boiler freezes, it should generate a fault code.

What you can do to help

There are internet instructions that explain to you how to safely defrost a condensate pipe. If you’re not sure you can handle it yourself, get your condensate pipe thawed by a qualified engineer.

10. The boiler keeps shutting off.

This can be caused by several factors, including a faulty thermostat, low water pressure, or a lack of flow.

What you can do to help

Check the pressure and thermostat. Call a licensed boiler professional to fix your boiler if resetting the thermostat, bleeding the radiators, and re-pressurizing the system fails.


The best way to deal with the problem is proactive when it comes to boiler issues. By safeguarding your heating system or boiler with our maintenance and repair plan, you can save money and save stress in the long term. One of these is a yearly service.

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