RSF 820/20 DHW PLAYING

[patryk]

I have RAVENHEAT RSF 820/20t and problem with it, when I open hot water tap water coming hot and after about a minute getting warm only.
When i turn DHW thermostat to minimum is the similar situation at the beginning water is warm then getting cold.
I have replaced DHW thermostat I can hear is clicking means working but it look like is not reacting quick enough.

I check on diagram impulse from thermostat is going to PCB and I don't know what is basically mechanically make this water hot or cold because burner work perfectly, CH works OK . Diverted valve has been replaced as well.
If somebody can help, pls.

 

[Agile]

It sounds as if you are trying to mend the boiler for someone.

I think you would be advised to call a proper boiler engineer.

Tony

 

[patryk]

Thanks for reply.
Diverted valve has been change by CORGI engineer then I had no hot water because he mix wires on microswitches. I got the diagram from ravenheat plugged correctly and warks but water still playing. When he ring me this morning he set car get broke and I should find somebody else.
Somebody told me Heat Exchanger is blocked with lime is this make any sense?

 

[glasgowgas]

Thanks for reply.
Diverted valve has been change by CORGI engineer then I had no hot water because he mix wires on microswitches. I got the diagram from ravenheat plugged correctly and warks but water still playing. When he ring me this morning he set car get broke and I should find somebody else.
Somebody told me Heat Exchanger is blocked with lime is this make any sense?

as much sense as your grammar.
why don`t you get the "CORGI" engineer back to fix his mess,
forget about his "car get broke" and tell him to get his backside back to
your boiler.

what was your original fault on your boiler that prompted you to get a "CORGI" engineer out?

 

[patryk]

Thanks
Sorry for gramma I'm forein never been in english school.

 

[Agile]

That boiler uses a rather odd way of controling the hot water temperature.

When it gets too hot it switches to a lower flame and then off it it is still too hot.

To function correctly the gas pressures have to be set correctly.

If the boiler has been used with the setting significantly incorrect then its possible for lime scale to form in the hot water part of the heat exchanger but thats fairly rare but only usually results from a boiler which has been bodged by someone who does not understand them.

Tony

 

[patryk]

To glasgowgas I wrote everything at the beginning unfortunatelly with my poor english, two handymens tried to fix it then somebody recomend me this engineer .

 

[patryk]

Thank you Tony now it have some sense to me.

 

[gas4you]

I wish I could write/speak another language as good as this

 

[patryk]

Thanks Dave

 

[patryk]

I found so somebody else have this problem I copied his words they maybe more clearly for all of you.

I've got a ravenheat rsf 820/20 combi boiler, but when i take a shower it starts nice and hot then goes cold, then back to hot again. it takes around 30 seconds to do this cycle. it does this 3 or 4 times during a 10 min shower. can anyone help please? also, ive misplaced my manual, so if anyone knows where i can download one from that would be great.
thanks,
lee

 

[GeorgeSlough]

gh

 

[GeorgeSlough]

Hi Patryk

I had a similar problem a couple of months ago, sorry to inform you that the solution was very expensive. When i calculated all the figures it cost me 50% of the value of my house.
Every time I took a shower, the water would cycle hot, cold, hot, cold. No boiler engineer in England could fix it. Eventually at my wits end, I discovered the problem - It was my wife - Whenever i got in the shower, she would get lonely, to take her mind off thing she would start washing the dishes.
There was only one cure - divorce her.

I am so disappointed with ravenheat - there is no mention of this in their troubleshooting guide.

 

[patryk]

Thanks George.
When I had this problem I bought dishwasher with cold feed only.

 

[GeorgeSlough]

It is the cold feed that is causing the problem, get a hot/cold feed dishwasher and keep a balance.