Problems with Ravenheat Combi RSF 84ET

mantamark

We have a 5 year old ravenheat combi boiler, always had intermittent problems, but they have always sorted themselves out, but there is a new problem & it isnt going away, help!

central heating works fine, but hot water is a problem.

Turn on hot tap and 70% of time it will fire up.

If i try to adjust the tap, ie use mixer to add cold water, or reduce the pressure the boiler cuts out.

Some times there is a sort of whistling noise coming from the boiler, a bit like a kettle? this can happen with CH, but 99% time happens with water.

Pilot light does not stay on, but lights itself every startup, i found this strange?

The pump is set on II, but there is a plastic box next to it with the same markings (I, II, III), but it is set to I, should these be the same?

When i run a bath there also seems to be some small black specks (1-2mm) appearing, when touched they leave a stain on the bath, it cleans off but i guess they shouldnt be present?

The breather on top of the boiler has alot of build up around it, will this cause problems?

Dont know if these problems all tie in or not, but some answers would be good, i will be getting a pro out, but we got duped last time & would like an idea of what needs fixed before we get someone out.

many thanks!

meuer

Hello there..

The first thing to do is to install a non return valve to the hot water pipe before the mixing valve... This will stop the cold water from going backwards towards the boiler, thus causing the kettle effect. The second thing is to replace the diaphram kit in the brass diverter valve, this is starting to disintergrate due to wear & tear. If you require this then pm me

hope this helps you & please let me know

I have sent a pm to you

[EMAIL="Michael@Meuer.com"][/EMAIL]