My boiler isn't working
We're proud to distribute gas to your home or business, but unfortunately there can sometimes be problems.
We are here to help if there is a gas emergency, such as a gas leak or you suspect carbon monoxide (CO)* is being released. We are also here to help if there is a loss of gas pressure from our network.In the event of a gas emergency, we act promptly to make sure the supply to your property or business is made safe and secure again.
There are other experts (gas safe engineers), who can help if your problem is not a gas emergency, such as a boiler fault, low system pressure or a frozen condensate pipe. This is often apparent by a “Fault code” being displayed or pressure needle indicating near to 0.
If your gas appliance (boiler, cooker or other appliance) is not working as it should, there could be a number of different reasons why. Between August 2017 and August 2018, less than 10% of calls from customers reporting that they had “no gas” related to a gas emergency or an issue with Cadent’s network that we needed to fix. The most common cause of the “no gas” calls were broken or faulty appliances, which, unfortunately, we are not able to fix. This flow chart can help you diagnose why your gas appliance is not working as it should so that you know the best person to contact so there is no unnecessary delay in fixing the problem.
Frozen condensate pipe?
During the winter, many people experience problems with their boiler due to frozen condensate pipes. If you have followed the flowchart and the guidance below and believe you have a frozen condensate, you can check if it is blocked or frozen and try to de-frost it or call a gas safe engineer to help you.
When gas is burned in a boiler, it produces Carbon Dioxide and water vapour. The water vapour exits the boiler via the flue – it's the plume you see from it on a cold day.
The moisture in the flue gas forms water droplets on the inside of the flue – this liquid is known as “condensate”. Modern “condensing” boilers are designed to collect this water and discharge it via a condensate pipe.
To check if your boiler has a condensate pipe, look underneath the boiler at the pipes connected to it. If one of these pipes is plastic (usually white and around 20mm wide) and the rest are metal then it's almost certainly a condensate pipe.
Track the route of the pipe and if it runs through the wall to an outside drain, the water in this pipe may freeze which can cause the boiler to operate strangely or sometimes not at all.
Symptoms of a frozen or blocked condensate pipe
Long periods of sub-zero external temperatures can mean that a frozen condensate is more likely. A blocked or frozen pipe may cause;
- a “gurgle / bubbling” noise from within boiler/flue when trying to light
- a Fault Code to be displayed on the boiler (varies with manufacturer – see table below)
- ice visible from condensate pipe outside
- water dripping from plastic condensate pipe at connection to boiler.
There's lots of advice available on what to do with a frozen condensate - pouring warm water on the external pipe, or wrapping a warm, wet towel on it are two common methods used for thawing.
If you are not comfortable trying these methods, then contact a Gas Safe engineer to assist you.
If you are unsure of the cause of your gas appliance not working and think it may be a gas emergency, then call us on 0800 111 999 immediately.
Common boiler manufacturer fault codes
The following fault codes are provided by boiler manufacturers as possible codes that could display as a result of a frozen condensate pipe.
||Possible fault codes
||Link to information
||F2 or L2
||E133 and E28
||F28 or F29
||F1, F4, F28 or F29
||EE or F4
||92, 93, or 95
* The signs of a CO release and symptoms of CO poisoning are explained here