Well howdy, sounds like you got yourself an airlocking issue with your central heating pump. Let me give you some advice on whether you can fix it yourself or if it's time to call in the pros.
Based on what you've told me, it seems like you've done some good troubleshooting already. However, it's always good to make sure we have all the information we need to make the best decision.
Here are some steps you can take to further troubleshoot the issue:
- Check the pressure gauge on your boiler - make sure it's not too low, as low pressure can cause airlocks.
- Inspect the pipes leading to and from the pump - make sure there are no leaks or kinks that could be causing the airlock.
- Check the valves on your radiators - make sure they're open all the way, as partially closed valves can cause airlocks.
- Check the automatic air vent - if it's clogged, it could be causing the airlock. If none of these steps solve the problem, it might be time to call in a professional.
If you do decide to fix it yourself, here are the tools and materials you'll need:
- Central heating inhibitor A central heating inhibitor is a chemical additive that is added to a central heating system to prevent the build-up of sludge, scale and corrosion, which can cause blockages and damage to the system. It helps to maintain the efficiency of the system and prolong its lifespan. The inhibitor works by creating a protective layer on the inside of the pipes and radiators, which prevents the build-up of these harmful materials. It's a good idea to add an inhibitor to your central heating system when it is installed or serviced, and to top it up regularly to maintain its effectiveness.
So, that's pretty much it! Always remember to turn off your boiler before doing any work on your central heating system, and be sure to follow any safety instructions that come with your tools.