Shower goes cold for no reason (running off the taps)

Ectophile

JG0 wrote: »

Could the hot and cold taps running together at the same time cause this? That would make sense. When I run both the hot and cold taps in the sink in the same bathroom as the shower they both run slowly, where as if only one is on then they're as they should be. When it's idle my water pressure is at 1 bar.

It may be that there's something restricting the water flow. Just because you've got 1 bar static pressure, it doesn't necessarily mean you can get a decent flow rate out of it.

If it is a restriction, you'd need to work out where. It could just be an isolator valve turned half off, furred up pipes, or a blockage in the supply.

On the supply side, you should be able to get at least 10 litres per minute from the kitchen cold tap.

southcoastrgi

1 bar isn't your water pressure that's the pressure in your heating system

dellboy102

What temperature is your water temperature set to on the boiler? I had this too and I turned it down (it was set to a very high temp which it could not maintain constantly), the problem went away.

Also there may be a setting on the boiler relating to "keep warm", this cycles the boiler so it always keeps the water warm for instant hot water, may be worth trying this too as a test if the first suggestion does not work.

Strider590

Reading the OP, it's basically a mixer system running directly off a combi boiler (which is never a great idea), so what is probably happening is the hot water flow rate is too low, causing the boiler to turn off.

Try turning the hot water temperature down on the boiler (not the heating), so that your using proportionally more water from the hot tap than cold.

JG0

dellboy102 wrote: »

What temperature is your water temperature set to on the boiler? I had this too and I turned it down (it was set to a very high temp which it could not maintain constantly), the problem went away.

Also there may be a setting on the boiler relating to "keep warm", this cycles the boiler so it always keeps the water warm for instant hot water, may be worth trying this too as a test if the first suggestion does not work.

Strider590 wrote: »

Reading the OP, it's basically a mixer system running directly off a combi boiler (which is never a great idea), so what is probably happening is the hot water flow rate is too low, causing the boiler to turn off.

Try turning the hot water temperature down on the boiler (not the heating), so that your using proportionally more water from the hot tap than cold.

The hot water temperature is very high, I'll try this and report back.

Thanks all for your help and replies.

Norman_Castle

JG0 wrote: »

I have a shower hose and shower head attached to the taps, which are separate hot and cold taps. It's quite fiddly to get a good temperature as I have to be very precise with the cold tap to get it to a temperature that isn't boiling and isn't freezing.

Once you've sorted your temperature problem fitting a thermostatic mixer tap would avoid fiddling with the temperature.

http://www.ebay.co.uk/itm/THERMOSTATIC-BATH-SHOWER-MIXER-VALVE-TAP-TAPS-DECK-MOUNTED-CHROME-1-4-TURN-057D/182771868727?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D2%26asc%3D47510%26meid%3D50f17ea9315041799cde7f2ac18d322c%26pid%3D100005%26rk%3D5%26rkt%3D6%26sd%3D141600984363&_trksid=p2047675.c100005.m1851