Ravenheat RSF 620/20 No hot water

[idontavaclue]

Hi all,

I am sorry to drop in unannounced!

however i would like some help on diagnosing my boiler problem! its a Ravenheat RSF820/20 and has been perfect for the last 10yrs that i have been in the house, i have been topping it up several times a week as the pressure drops down from 1.5 to just under 1.bar when the central heating has been on for several hours, i know there must be a leak but i cant seem to find it anywhere? i cant even see it coming from the expansion pipe.
That aside the heating works pretty much ok its just that my hot water is luke warm and i cant get it any hotter, if i have the central heating on it makes a little bit of a difference but not a great deal, could this be the Diverter Valve and if so is it a costly and big job to replace.
i am not a plumber but i can turn my hand to almost anything so as long as i can get hold of the part i will attempt a repair, obviously unless it involves messing with the gas.

Thanks in advance guys and have a happy new year.

 

[Andygasman2010]

You've done very well to have a perfect Ravenheat for 10 years! That's got to be a record.

You may well have a split hot water diaphragm and the diverter valve may also be passing to the rads.

You can replaced the whole valve...

http://www.amazon.co.uk/Ravenheat-RSF-Diverter-Valve-5012049/dp/B005H5Y8V0

Or you could just fit the diaphragm...

http://www.amazon.co.uk/Ravenheat-Diverter-Repair-5012051-Diaphragm/dp/B005Q6MLAA

If you only fit the diaphragm you can strip/clean the diverter valve instead of replacing it.


This won't cure a pressure loss fault though. You may need to recharge the expansion vessel and possibly replace the pressure relief valve.

Or you could just have a leak somewhere.

 

[dcawkwell]

Expansion vessel needs recharging.

A new diverter valve diaphragm and a strip and clean should
have it running for another 10 years.