No running hot water, Potterton 28i

[wibbit]

Good day all.

I was hoping some nice people here may be able to provide some recommendations.

I have a potterton 28i boiler, and over the last few months, it seems to have developed a slight problem :\

Recently I've noticed while doing the washing up that unless I had the tap open fully, I would find the water coming out of the hot tap would gradually cool to the point of being cold. If I turn the water flow up, usually to full, then the hot water will commence.

During the week, we've ended up in a situation where there appeared to be very little hot water available for showers, the water was not "cold", but it was only a degree or two above the level of the cold water (turn the "hot" off, and it would get cold, but with the hot on, it wasn't even warm).

I think the problem I have is probably very similar to Rossyl (//www.diynot.com/forums/viewtopic.php?p=732887&sid=a9450c95a461b61d85f314cefa506c9c), and am resigned to having to get an engineer in, however I was hoping to get some idea of cost for the work or parts, so that I was not entirely ripped off

Could any one provide any input?

 

[bengasman]

would that be the performa?

 

[wibbit]

would that be the performa?

Oops, sorry, I thought I had said that

Yup the performa.

 

[bengasman]

If you open the hot tap half when boiler is fully cold, does it do anything at all? Click, pump on, fan on?
If so it is probably thermistor.

 

[gas4you]

Am I missing something on this post? I would check the diaphragm first.

Classic sign of being slightly perished or holed.

 

[wibbit]

Am I missing something on this post? I would check the diaphragm first.

Is this some thing I'm able to check my self, or is a registered corgy person needed?