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Yatesy

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Reply with quote  #1 
I have a Burstner 615. I am finding that the water from hot water tap falls back if not used regular. Each morning I have to prime it. I have replaced the valve on top end of the cylinder thinking that could be the problem. It wasn't. I am told I might be letting air into the system. I have found it impossible to trace the pipe work thru the van. Any ideas how I might be able to track it down, or do I have another problem?
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rayc

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Reply with quote  #2 
There should be a non return valve in the cold water feed into the boiler to stop water draining back. It sounds like you have a micro switched system as opposed to a pressure  operated one otherwise I presume the pump starts up randomly??
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BurtSner

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Reply with quote  #3 
I’ve got a Burstner and I haven’t got a clue what to look for or where, not only that but all the pipework is well hidden 
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peejay

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Reply with quote  #4 
Just wondering if its the cold feed that needs priming as well?

I've had that happen twice before on mine (micro switch system), there is a non return valve within the submersible pump itself which is dropped inside the water tank, had to replace the whole pump as they are not repairable. Quite a common occurence on Hymers and (I think Burstners) with the micro switch system. I always carry a spare pump nowadays.

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Yatesy

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Reply with quote  #5 
The system is a micro switch. I am in the process of taking a look at the pump and as you have suggested I am going to renew the non-return valve as it is fairly cheap and if that fails I will take a good look at the pump. It was suggested to ne that I might have a water leak but on examination there is mo sign of that. Thank you for your suggestions. Will let you know how I get on.
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SANDBAGSID

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Reply with quote  #6 
Have you bled both the cold and hot water systems as on my old Moho if I ran the cold without the hot tap open a bit it wouldn’t bleed the air out properly and hot would spit air for ages till it cleared out the whole system. Just a thought.
Do you have an access in the top of the fresh water tank so you could dip the tank mark the dipstick then dip it again after a day or so to see if there is a water leak in the system .

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Yatesy

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Reply with quote  #7 
Have bled the system several times and on every occasion when the system has been left to stand over night the cold water comes thru no problem there but the hot will splutter for some time before it comes thru. Found a site for Burstner which has details for removing and replacing the pump unit and the non- return valve. Looking hopeful now to resolving the problem.
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Gerty

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Reply with quote  #8 
As I haven´t filled the tank from empty on my own yet I am just checking with you.

I am sure when Hans filled it he would. turn the tap on to the hot water before starting to fill the tank to allow the water to push all the air out and when it stopped spluttering then turn off the tap, am I correct in thinking that?

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SANDBAGSID

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Reply with quote  #9 
I open both just a bit so the water can push the air out of both systems at the same time, cold usually comes through a bit quicker than the hot I think because it has to push air out of the boiler as well.
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Gerty

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Reply with quote  #10 
Quote:
Originally Posted by SANDBAGSID
I open both just a bit so the water can push the air out of both systems at the same time, cold usually comes through a bit quicker than the hot I think because it has to push air out of the boiler as well.


I only have one tap.

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BurtSner

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Reply with quote  #11 
Put it central so That  it tries to feed hot and cold In order to come out warm. 
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SANDBAGSID

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Reply with quote  #12 
Beat me to it Simon.👍
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Gerty

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Reply with quote  #13 
Quote:
Originally Posted by BurtSner
Put it central so That  it tries to feed hot and cold In order to come out warm. 


I wouldn't have the boiler on whilst filling [biggrin]

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powerplus

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Reply with quote  #14 
Quote:
Originally Posted by Gerty


I wouldn't have the boiler on whilst filling [biggrin]



i suppose it all depends if you are filling or topping up

if we forget to top up and the tank gets low water starts to spit when opening the tap

once topped up i just  turn the taps on and off a couple of times till both hot and cold stop spitting

some pumps will slowly leak some of the pressurised water back  to the tank if there is a slight internal leak on the pump

this is why people can hear a slight pulse of the pump every hour or so without finding a leak


barry




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BurtSner

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Reply with quote  #15 
Quote:
Originally Posted by Gerty


I wouldn't have the boiler on whilst filling [biggrin]


i didn’t say to have the boiler on. Just put the tap into the midway position 

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rayc

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Reply with quote  #16 
If the non return valve in the pump were faulty then you would expect there to be a delay in cold water supply in a similar manner to the hot. I would be looking for a non return valve close to the boiler installed in its cold water inlet feed. Of course there could be a leak somewhere in the hot water system e.g. boiler or pipework etc.
It appears it is a micro switched system so loss of pressure causing a short cycle of the pump does not apply.
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Yatesy

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Reply with quote  #17 
Quote:
Originally Posted by Yatesy
Have bled the system several times and on every occasion when the system has been left to stand over night the cold water comes thru no problem there but the hot will splutter for some time before it comes thru. Found a site for Burstner which has details for removing and replacing the pump unit and the non- return valve. Looking hopeful now to resolving the problem.
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Yatesy

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Reply with quote  #18 
I think I have had a bit of luck. Checking various comments ine suggested I give the water pump a shake which could release an airlock. I did this and low and behold it now works - no sputtering from the hot tap after an overnight stand. Keeping fingers crossed but if it fails again will look to replace pump and non-return valve. Thanks to everybody who put forward suggestions. Cheers
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Gerty

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Reply with quote  #19 
Next time you meet someone who´s just a bag of wind you´ll know what to do [biggrin]
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Yatesy

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Reply with quote  #20 
Continuing saga of a Reich submersible water pump: Having bought a Reich unit and assured by the supplier it had a non return valve the pump did not work. Sent it back and the supplier replaced it with am identical unit . I emailed Reich with a photo of the pump and asked them to confirm that the unit had a NRV. They came back and said it doesn't have one and dont make them any more. So, how does a automatic vented pump work? Can somebody enlighten me as I do have air in my water system and cant get rid of it?
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SANDBAGSID

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Reply with quote  #21 
Running the hot and cold tap should clear any air unless the system has a leak somewhere and it’s drawing in air from somewhere.
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Yatesy

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Reply with quote  #22 
At last I have fixed the sputtering hot water caused by the water falling back when not in use. I installed an in-line NRV on the cold water inlet to the boiler. Placed it as close as I could to it. Thanks everybody for your many suggestions. Cheers
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SANDBAGSID

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Reply with quote  #23 
Good you got it sorted and thanks for posting the answer 👍
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Woody

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Reply with quote  #24 
Yes, so good to have someone let us know the outcome. Lots of people look for advice on here but don’t bother to acknowledge the help. Glad it is fixed now Yatesy. 
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