Central Heating Over Flow Issue that's stumped many heating engineers :(

Ruski

It wouldn't hurt to adjust the ballcock so that you have at least an inch before overflow anyway.

What about the expansion pipe - have you any way to see if that has let water into the header tank?

Russ

drummer_666

any time anyone has come they say water is not entering the tank whilst they are there... typical.

i haven't personally seen water enter the tank either (through expansion pipe or by water level rising).

The guys tested heating and hot water being on full blast, with thermostat up to max on cylinder and all seemed ok too. These people also bent the arm of the ballcock lots and said he didnt want to do it any more as it could well snap - so did it as far as he felt it would go.

I didn't look at the water level when he did that, to see if it's moved somehow, but its def not an inch below overflow.

Although a dif guy yesterday looked at that and said was shutting off and ok.

I have someone coming out tomorrow to fit a check valve to bath/shower, so I'm hoping that will fix it. Seeing as the new shower went in Jan and sometime that problem the problem started... fingers crossed.

Ruski

drummer_666 wrote: »

Well left taps on ages in turn.

Bathroom mixer - no water entering tank.
Presuming you 'mixed' H & C then there should be water entering the tank - could this be the cause? Was mains pressure water backfilling the tank?

Shower mixer - water entering tank but from what looks like mains feed (pic below - it's left side of the tank)
Sounds correct




Also as I was using mixer, isn't water supposed to be going into the tank - to refill? Yes

After I'd ran taps for ages and turned off, the cold water tank was nearly empty so it began refilling (out of same place in pic above)

I turned off the tap on the pipe, so water couldn't enter the cold water tank and then ran shower and no water came out.
If there's no water in the header tank you wouldn't get a flow of hot water.

Also, the tank fills up without using the shower.
As above - suspect the bath(?) mixer

Sounding feasible?

Russ

drummer_666

i'm not suspecting the bath taps as they've been in place for prob close to a year and no probs

but to be honest i know nothing about plumbing at all, it's my dad that knows some about it and fitted and connected bath/sinks/showers throughout the house

tried messing about again with plastic stick and marked the water level on etc but given up confused/frustrated

all i can do is hope it is water backflowing from shower/bath...


thanks for everyone posting on this trying to help me btw

drummer_666

person out at mo thinks that putting a non return valve to the hot will cause no hot water to come out of the shower - seeing as pressure is different...

Ruski

Tell him to put on a pressure reducing valve on the cold then!

Russ

drummer_666

he said there's def not enough pressure to use that - i have bad pressure but it fluxuates on the cold from bad to really bad (as about 12 houses are on the same supply).

drummer_666

found shower is passing water thru constant, even when off.
so guess that means found the cause... now to see if these guys fix it1

Ruski

drummer_666 wrote: »

found shower is passing water thru constant, even when off.
so guess that means found the cause... now to see if these guys fix it1

:j:j:j:j:j

drummer_666

lol

but,,, it's just whether they fix it or not
and if they fix it without making my shower redundant


*fingers crossed*