The boiler seems to work fine i.e it heats up all the radiators and hot water on demand but the pressure release valve drips quite a lot when the heating is on and the pressure seems to build up to sometimes above 3.5 bar, which is a bit worrying. I bleed the radiators (with the boiler off and cold) which reduces the pressure to around 1.5bars but it just builds up again. any ideas on what's wrong and how to fix it?
2007-03-11 03:22:19 · 10 answers · asked by Anonymous in Home & Garden ➔ Maintenance & Repairs
Is your top up connected permanently this should nt be as valves can pass & cause pressure rise . Or heat exchanger through which your domestic hot water is supplied is feeding viva exchanger unit into your central heating system to mains pressure approx 3 or 4 bar usually (ring any bells) . If your top up is disconnected then must be exchanger unit (only other source of pressure possible , check expansion vessel working ok check air pressure. good luck hope this helps
2007-03-11 07:57:30 · answer #1 · answered by murray 2 · 0⤊ 0⤋
The pressure when cold should be 1.5bar. If its creeping up on its own it sounds as though the the filler valve is either passing or is open slightly. the pressure relief valve on a combi boiler is usually set to open at 3bar. You can release pressure by manually turning the red knob on the top of the pressure relief valve.
2007-03-11 03:33:30 · answer #2 · answered by derek 3 · 0⤊ 0⤋
Most likely the valve on the filling loop......... if its one of those screwdriver slot type its so easy to leave it slightly on. I would get a new filling loop with a valve that has a lever handle on & you will be able to know better that its switched off, I had the same problem. Its also so easy to fit..... about 5 - 10 minute job.Just switch off at mains & (make sure boiler is not about to fire up) then just disconnect old filling loop , new one on fill up again to right pressure ........jobs a good' un
2007-03-11 04:43:27 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Sounds like a fault with your pressure relief valve. this allows excess pressure to be relieved from the system and should be on the inlet side of the boiler, at least it is on mine, when you refill see at what pressure it lifts. If this is normal it may be the valve seat or the rubber. If not then you have a leak somewhere.
2016-03-29 00:02:32 · answer #4 · answered by Anonymous · 0⤊ 0⤋
disconnect fill loop (water bylaw uk). unlikley to be anything else. NEVER use red pressure relief valve to remove pressure it is a saftey device ,( and it gets grit inside and causes it to fail) use a drain off point and hose. turn off the boiler and get a plumber to fix the the problem asap because its dangerous to run at high pressure
2007-03-11 06:47:32 · answer #5 · answered by Anonymous · 0⤊ 0⤋
Is where you put water into the boiler connected and if so is it on slightly?
(mine is under the boiler a bendy hose thing a bit like in a shower)
2007-03-11 03:25:30 · answer #6 · answered by Anonymous · 0⤊ 0⤋
Either your top up valve (filling loop) is open slightly slowly allowing water into the system or the expansion tank is knackered
2007-03-11 03:49:28 · answer #7 · answered by I got wood 4 · 0⤊ 0⤋
wate r level float valve has vent on top to allow pressure to escape .May be closed,full of water.open and drain.
2007-03-11 03:31:49 · answer #8 · answered by Anonymous · 0⤊ 0⤋
you need a plumber to fix this honest, i had a similar problem not so long ago i tried most things, then my mate a plumber took it apart (corgi reg is a must) dont know what he did but its ok now..guid luck...
2007-03-11 03:27:20 · answer #9 · answered by eddee d 2 · 0⤊ 0⤋
I would get a pro in,it sounds risky.
2007-03-11 03:26:22 · answer #10 · answered by patsy 3 · 0⤊ 0⤋