No hot water? Loss of water pressure could be to blame. Luckily, low pressure on your boiler is fairly easy to diagnose and in some cases can be a DIY job.
Here is our handy guide and fixes to the most common boiler pressure issues that you could be facing.
1. What is boiler water pressure?
Your water needs to be stable, as your boiler heats the cold water that flows around the circuit of pipes and radiators throughout your home. In most modern combi boilers, pressure is maintained by a ‘filling loop’.
2. Why has the pressure on my boiler dropped?
There are many reasons that could cause a drop in pressure in your boiler, but the two most common reasons are leaks and bleeding radiators.
A. Leaks in the boiler system
There could be a leak in your boiler system. It could be a small leak that has gone unnoticed but had lead to a gradual drop in the water pressure.
Have a look around your boiler, pipes and radiators for signs of damp patches. Never open up your boiler to look inside, only a fully registered Gas Safe engineer should do this. If you find a leak or seem to need to have to top up the water pressure regularly then give us a call on 01424 200 005.
b. Bleeding Radiators
Have you bled your radiators recently? This may have caused a loss of pressure. When you bleed a radiator, you release air which lowers the pressure in your boiler system. Learn how to bleed your radiators.
3. How do I check my boiler pressure?
On the front of your boiler, you will usually find a water pressure gauge. If you have a hydraulic pressure gauge you will see low and high pressure indicated by red sections on the dial. The position set when the boiler was installed is sometimes shown by a red indicator needle.
On most digital gauges you will see a flashing pressure reading if there’s a low or high boiler pressure warning.
If your boiler pressure bar reads less than 1 bar, it’s possible you might have lost water from the system that needs to be replaced.
If your boiler pressure gauge is above 2.75 (high pressure), you may need to bleed a radiator to bring the level down to around 1.5. High water temperatures can make bleeding your radiators to release pressure quite tricky and sometimes dangerous, so if you aren’t sure – call Southern Energy Solutions and we will get an engineer to do this for you.
4. Can I fix low boiler pressure myself?
Before you do anything, check your boiler manual to see if you can re-pressurise it yourself. Your boiler may also have instructions on the rear of the control panel – if you need any tools to remove this, don’t touch it, make sure you get in touch and we will send a Gas Safe engineer to do this for you.
Look for helpful tutorials or videos about topping up pressure on the boiler brand’s website.
The basic boiler re-pressurising process goes like this:
- Switch off your boiler and allow it to cool
- Double check both ends of the filling loop are securely attached
- Open both of the valves to allow cold mains water into the system
- Wait for the gauge to read 1.5
- Close both valves, one after the other
- Undo both ends of the filling loop and remove, be careful to catch and water spillage and keep the filling loop in a safe place – just in case you need it again!
5. Do I need a Gas Safe engineer?
If you are in ANY doubt, or you have done so according to the manual but are still experiencing pressure problems, we recommend that our expert heating engineers should come out to diagnose and fix the problem.
Fill in the contact form below or phone 01424 200005 to book an appointment with us.