Boiler Care Guide & Support
Having Problems with your Boiler? We’re here to Support you.
If you are experiencing problems with your boiler, read our boiler care tips below which will help you to solve a variety of common issues and error codes. Alternatively, speak to us on our live chat on the website or contact us at your convenience for any boiler troubleshooting advice and solutions.
Emergency Contact Numbers
If you smell gas or suspect you have a gas leak, please contact National Grid on
0800 001 999
Do you have low pressure or a low pressure error code showing up on your boiler?
- Establish which type of filling loop you have – is it built into the boiler or external from the boiler?
- Operate the filling loop by opening the valve(s) slightly, allowing the water to flow into the system. Increase the pressure to 1.5 then shut off the valve(s).
- Depending on your boiler, the following video from Vaillant may be helpful.
(Advice for error codes Vaillant F22, Ideal F1 and Worcester A1)
Do you have a problem with frozen condensate? Follow tips and the steps below:
- Use hot, not boiling water, and pour this onto the condensate pipe.
- Repeat until the blockage has been cleared.
- Reset your boiler.
(Advice for the following boiler error codes: Vaillant F77, Ideal L2 and Worcester EA)
How to bleed your radiator
Is your radiator cold on the top? This requires bleeding – follow the steps below.
- Use a bleed key and open up the bleed vent on the radiator slightly (not fully).
- Air will rush out.
- Keep the vent slightly open until water runs out (use some tissue or an old rag to catch the water). Don’t open the vent fully.
- If you have a pressurised system, you will need to top up the pressure to 1.5 bar. Follow the steps under ‘Low Pressure’ above.
If your radiators are still not working, call us on 0333 009 0090 and we will send an engineer to look at this.
(Advice for error codes Vaillant F22, Ideal F1 or Worcester A1)
Other Radiator Issues
Radiator not working? Follow the steps below to see if you can fix it yourself!
- Check radiator valves are open.
- Thermostatic radiator valves have numbers on them – make sure the number is higher than 1, and keep turning this up until you are happy with the temperature.
- Lock shield valves must be turned left to open them. If they will not turn, they are fully open.
- Check the radiator has been bled using the steps under ‘How to Bleed Your Radiator’ above.
Still having heating problems? It could be an airlock:
- Make sure the valves are open on the boiler
- Make sure you have tried to bleed it
- Turn off all other radiators in the system
- You may hear a gurgling sound