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I've got an oil fired combi in a big grey box outside the house. It runs the heating, and hot water.
Yesterday about half way through a shower there was a clunk and the water stopped. Same today, you can turn the tap off then on again and it'll keep happening but if you give it a bit of a rest then you can finish your shower.
The other taps seem ok but I haven't run them for an extended length of time.
The heating seems to be fine.
I don't think I've much chance of getting a plumber round before the family arrive on Fri so If anyone has any ideas what I should be checking I would be a grateful man.
Any chance your combi gives you a fault code?
Mine does similar this time of year from cold, the return temp difference is too great and it lunches itself. Works fine after a couple of restarts when it’s all up to temp.
Either way the week before Christmas is going to see the boiler man relieve you of a few quid..
Sounds like a solonoid dropping out to me.
What oil fired combi is it?
It's a big grey box đŸ˜³ It was here before me and I've not come to terms with it yet.
I'll see if I can find the manual.
Mine did this. The box did not have enough ventilation and the boiler was picking this up
Its made by grant, and the Mrs covers it in plants, no recent change tho. Still i'll need to clear it to find out which it is and have a look.
For water to stop flowing it is unlikely to be combustion related, hence why I think solonoid.
Sweepy - take a picture and message it to me.
[img][url= https://farm5.staticflickr.com/4597/25316475348_c9667cb4fe_k.jp g" target="_blank">https://farm5.staticflickr.com/4597/25316475348_c9667cb4fe_k.jp g"/> [/img][/url][url= https://flic.kr/p/Ez8y7h ]IMG_20171220_211012563[/url] by [url= https://www.flickr.com/photos/150960472@N07/ ]andy ayliffe[/url], on Flickr[/img]
This is the beast
That looks like a Grant to me. I'll have a look for some instructions.
Oil combis tend to use a small amount of stored hot water that flows into the plate heat exchanger when the flow switch calls,so you have flow switch on the incoming cold wired to a circut board in the boiler, that will turn on the hot water circulator and burner to re heat the store water this is then controlled buy a thermostat, if you heating works fine the the burner is good, so you need to check the flow switch and cuircuit board. Or could be your shower valve?
Not much help really good luck.
Horse is correct it works with a flow switch so no solonoid valve.
Is it the flow that is stopping? It could be the thermostat shutting on the shower?
Yes its the flow of water that stops with a loud clunk, a bit like a short water hammer kind of sound.
I wondered about an airlock?
If you run the bath hot for 10 min and it maintains heat then your boilers HW good.
I'll do that tomorrow, thanks for the help lads, i'll let you know how it goes.
More likely your tap than the boiler if other taps work ok.
is the clunk audible when your in the shower or is it someone standing next to the boiler telling you its clunking ?
i have a grant combi ... the flow switch tends to flicker on and off at low rates rather than cause immediate SWITCH off as your describing. More so when new - i took my flow switch out and filed it down slightly to stop it jamming on its own housing and that improved the flickering.... but i still dont think thats whats causing your clunk
im going with shower valve.
The clunk is audible from the shower. We have taps recessed into the tiles, top one turns water on, bottom adjust temp not that we ever do, just leave it on coldest setting.
Today I turned it a fraction towards hot and it didn't happen so I think you might be onto something, I'll try running a bath tonight and see how we go.