Please check my thinking on MH water problem.

[nicholsong]

On the penultimate day of our trip back from Greece to Poland we had spent a cold night in Austria, for which i had prepared by leaving the heating on '2' and ensuring the peg was blocking the Truma dump valve, but next morning the water was slow to flow but did eventually. Then it failed to flow again until a few seconds elapsed.

I suspected that the boiler had dumped, and maybe syphoned the cold water tank also, as it had done previously. However there was still water in the tank and the problem was affecting both hot and cold systems.

My analysis is that it is a failure of the one-way valve integral in the Reichle pump which allowed the water in the pipes to flow back to the tank. If this is the case I can fit an in-line one-way valve rather than buy a new pump.

Can anyone please confirm my diagnosis, or suggest another cause and solution for the problem?

Thanks in advance.

Geoff

 

[berni109]

Cost u very little to add an additional non return valve so try that first.

 

[Minxy]

If you have one of the clear plastic filters see if it has a crack in it, that was the problem with ours although we suffered a lot of air too, unfortunately you can't always tell if there is a hairline crack though so our dealer replaced it and it cured the problem totally.

 

[nicholsong]

If you have one of the clear plastic filters see if it has a crack in it, that was the problem with ours although we suffered a lot of air too, unfortunately you can't always tell if there is a hairline crack though so our dealer replaced it and it cured the problem totally.

Thanks Mel, but no filter in our system.

Geoff

 

[TheBig1]

even with a peg locking it, the dump valve can still trigger, with the result being a dribble from the output rather than a gush. This can cause an airlock when the pump tries to refill

^{_{Subscribers  do not see these advertisements}}

 

[nicholsong]

even with a peg locking it, the dump valve can still trigger, with the result being a dribble from the output rather than a gush. This can cause an airlock when the pump tries to refill

Understood, but should only affect the hot water, not the cold?

 

[TheBig1]

Understood, but should only affect the hot water, not the cold?

it affects both

 

[TinaLes]

Hi Geoff nicholsong
I am confused as to why you have to peg the auto drain off valve in your N&B Arto, as I thought with heating on overnight, albeit on low setting at No2, that presumably you have double floored, fully winterised van, and as such that the drain off valves for boiler would be kept warm.
If however that is not the case, could you not divert some warm air heating ducting, or hot water pipes if Alde down to that space to prevent the auto dump opening below 8 degrees C?
I only ask as N&B are great well made vans that are winterised, so this problem you have should not happen, with the heating on especially.
I hope you find a cheap quick fix to this happening again, keep us posted.
All the best.
LES

 

[CazPaul]

Hi Geoff nicholsong
I am confused as to why you have to peg the auto drain off valve in your N&B Arto, as I thought with heating on overnight, albeit on low setting at No2, that presumably you have double floored, fully winterised van, and as such that the drain off valves for boiler would be kept warm.
If however that is not the case, could you not divert some warm air heating ducting, or hot water pipes if Alde down to that space to prevent the auto dump opening below 8 degrees C?
I only ask as N&B are great well made vans that are winterised, so this problem you have should not happen, with the heating on especially.
I hope you find a cheap quick fix to this happening again, keep us posted.
All the best.
LES

Yes my thoughts too, should be well winterised that van.

 

[BouncyBoatFolk]

Was the water tank empty then? Would leaving the boiler on to heat hot water on an ECO setting have mitigated the action of the dump valve? Purely curious.
Mike.

^{_{Subscribers  do not see these advertisements}}

 

[nicholsong]

As I wrote in my OP the dump valve was only a first thought, but eliminated, and I think it is the one-way valve, which will be proved, or not, by fitting a second one in due course.

If not that I am stumped.

Geoff

 

[dabhand]

Is the pump actually working on full pressure? If pressure is reduced it could be a failing pump if it’s a twin