A280P Combi

[oldie]

Here's my problem when I start the shower after a short time (enough for a quick shower) the water turns stone cold. Then I can’t get the hot water back through without turning the shower control to full hot. Whilst it is warm, the flow is low but enough for a shower. When it went cold, the flow increases a fair bit. I've had 2 plumber out to no avail..
Alfie

 

[bengasman]

Are you sure it is a combi and not a waterheater?

 

[hedsa]

I would guess its an alpha 280p and it needs a new diaphram

 

[oldie]

Thanks Hedsa, Wow your fast! is it a job that I can do?
Alfie

 

[namsag]

Do your hot taps also play up if not its probably stat cartridge in shower

 

[oldie]

Shower is new Taps are new. It's not the mixer shower that has not thermostat. Thanks

 

[oldie]

OK turned hot tap in bath full on that never goes cold. So problem is the shower goes cold as above. The shower is a mixer one with no thermostat just an insert with 2 holes to let either hot or cold to the head dependant on mixer handle position. So could it be that the A280 switches off after supplying hot water to the shower for a while because it sees a low flow or is there a fault with an A280 part? Sorry I didn't have full info before.
Alfie

 

[oldie]

Ok heres a bit more info in the hope it helps you to help me.

1. The hot water output is only about 60% of the cold water (I was told they should be about the same)
2. If you turn the mixer shower tap to midway (50%) the boiler cuts off and only cold water comes out.
3. If you turn the washbasin tap down so that it is only 20% on the boiler cuts off and only cold water comes out.