Boiler overpressurised, Filler left open

dirkk · Wednesday at 9:19 PM

Evening all

Our boiler dial was showing over pressure (+3bar) and the PRV had obviously triggered multiple times, it looks like I didn't completely close the filler last time I topped up the boiler.

I immediately switch the heating etc. off and started the drain water from a radiator but have so far hsve removed a couple of ltrs and the dial hasn't moved yet, the boiler is still showing a temp of 59c and the pressure still sitting at 3bar.

The there anything more I can do to get the pressure down.

Thanks in advance.

terryplumb · Wednesday at 9:24 PM

Are you sure the filling loop is closed ,show us pictures of it.

dirkk · Wednesday at 9:32 PM

dirkk · Wednesday at 9:36 PM

The little white knod next to the larger key is screwed all the way to the right, if I unscrew it to the left I hear rushing water.

terryplumb · Wednesday at 9:47 PM

Continue draining water out of the system ,preferably from a drain cock.

terryplumb · Wednesday at 9:50 PM

Close your mains cold water stopcock as well.
Tell us the result

dirkk · Wednesday at 10:05 PM

Mains stop cock closed & drained, radiator bleed open for around 10mins, (cant find a drain cock) but no change in the dial, still showing just over 3 bar.

Drained out another couple of ltrs from the radiator.

Possibly a fault in the gauge, due to being overpressuriesed?

The PRV has not fired again as the area under it is dry.

I will perhaps needs to get a plumber in tomorrow.

terryplumb · Wednesday at 10:07 PM

Show us a picture of the pressure gauge / dial.

Mottie · Wednesday at 10:08 PM

Keep draining it till it stops then see what the gauge says.

dirkk · Wednesday at 10:11 PM

terryplumb said:
Show us a picture of the pressure gauge / dial.

dirkk · Wednesday at 10:12 PM

The condensation in the gauge is new, wasnt there last tu.e I was in about the boiler a few days ago

terryplumb · Wednesday at 10:13 PM

Tap on the dial with your finger nail several times ,see if the pointer moves.

dirkk · Wednesday at 10:15 PM

That did the trick, the dial was stuck, do you think the gauge will need replaced?

dirkk · Wednesday at 10:16 PM

FYI, it is now showing 0bar

terryplumb · Wednesday at 10:16 PM

Probably not ,see how it goes. What is the gauge / pressure reading now ? I suspect it may need topping up.

diynot

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local

Boiler overpressurised, Filler left open

Similar threads