What pressure should a boiler expansion vessel be?

1 bar
Summary. Expansion vessels, also known as expansion tanks, keep the pressure in a combi boiler stable while water heats and cools. They are typically located inside the boiler casing. The typical pressure a boiler system should be set to is 1 bar.

How to pressurise a Worcester Bosch 28I expansion vessel?

Steps are: 1. Drain water from boiler / system (drain off point or radiator bleed valve or boiler drain point – NOT pressure relief valve. 2. Leave drain point open, pressurise expansion vessel with air to manufacturer’s specified pressure.

Where do you find the fault code on a Worcester Boiler?

When a problem occurs with your Worcester boiler, your control panel should display a fault code. In the case of Worcester boilers, their fault codes start with EA. The Worcester EA fault code will give an indication of the problem. You’ll be able to find the cause of the fault by referencing the fault code, in your owner’s manual.

How can I tell if my expansion vessel is faulty?

The Vessel needs to be checked with NO Water Pressure in the Boiler with a Foot Pump should read about 20 PSI on the Gauge. Get a Proper Heating Engineer, Someone that Knows what they are Doing.

What to do if your Worcester Boiler loses pressure?

When a Worcester boiler gets below a certain pressure, it will lockout. To fix this, you’ll need to re-pressurise it using the external filling loop. But, that’s only a temporary fix. To solve the problem with your Worcester, and clear any fault codes, the leak needs to be found and fixed. Check out our guide to boilers losing pressure here.

Why is my Worcester Bosch expansion vessel losing pressure?

If boiler pressure on gauge rises by more than about 0.5 bar when system is hot then its quite likely the expansion vessel is the problem. Presumably you’ve already checked that no water comes out of the Schrader valve on the expansion vessel. The water is leaking through the condensation pipe, a considerable amount, i think this is the problem.

Why does my Worcester Bosch Green Star 28I pressure drop?

Now pump up your vessel to 1 bar. Release the water side pressure again until it’s zero, and see if the air pressure has dropped. If so, bring it back up to 1 bar. Now you can top up the water side to 1 bar also. See where that gets you. I suspect it is your expansion vessel – most of the symptoms suggest this.

What should I do if my expansion vessel is losing pressure?

Re-pressurise boiler and system to manufacturer’s specified level – 1.2 bar is usually about right. 4. Run heating. If boiler pressure on gauge rises by more than about 0.5 bar when system is hot then its quite likely the expansion vessel is the problem.

What to do if there is no water in a Worcester Bosch Green Star?

If there is no water, then you need to recharge the vessel, but first you need to ensure the water side is at zero pressure. You do this by bleeding a rad (takes time) or opening a draincock if you have one. You stop when water is no longer being ejected under pressure. Now pump up your vessel to 1 bar.