Is it normal for boiler pressure to drop when off?

When your boiler is switched off, the pressure gauge should read around 1 Bar – in the green zone on the gauge. When it is in operation (demanding heat/hot water), it’s pressure will increase slightly, then it should drop back down.

Does cold weather cause low boiler pressure?

As winter approaches, the pressure on the boiler is just going to increase. Running your system at very high temperatures during the winter months can also put a lot of pressure on the boiler’s parts.

When does the pressure drop on a combi boiler?

I pressurize it to 1.5 bar by means off the filling loop My combi boiler pressure drops to zero when my boiler is off. Hello I have no water at all coming out my hot taps, the pressure dropped and now nothing. I have a combi boiler, the heating is working fine and the … read more Vocational, Technical or Tra…

When does boiler lose pressure when heating is off?

I have a Baxi Duo-tec 40 Combination Boiler installed in June 16. It loses pressure every night. We top up the pressure to 1.5 bar in the morning and the heating runs fine without a loss of pressure until the heating goes off late in the evening. 1 hour later the pressure has dropped below 1 bar and in 2 hours it is 0 bar.

When did my Baxi 105he combi boiler lose pressure?

Discussion in ‘ Plumbers’ Talk ‘ started by Rebel49, Oct 13, 2014 . I’m at my wits end with my 7-year-old Baxi 105HE combi. It’s losing pressure quite rapidly, i.e. from 1 bar to nearly zero overnight.

When do you know if your boiler needs to be replaced?

On most digital gauges, you’ll see a flashing pressure reading, if there’s a low (or high) pressure warning. If your boiler pressure reads less than 1 bar, it’s possible that you might have lost water from the system, which needs to be replaced. This is where that filling loop (or filling link) comes in again!

What does it mean when boiler pressure drops to zero?

Many thanks. Blimey, a mystery indeed . If it’s dropping from 1bar to zero virtually overnight, that indicates a sizeable leak – which should in theory be noticeable. Unless it’s under the floor. Are these the same symptoms you had 6 months ago when the expansion vessel was replaced?

Where does the water come from in a combi boiler?

Should the pressure get too high – 3 bar is usually the limit – the water will be discharged out of the system via the pressure release valve (PRV). In a household with a combi boiler, there is no feed and expansion tank in the loft. Instead, the water inside the radiators is supplied directly from the mains.