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Just to make sure it's that but I wouldn't power flush a Vaillant they leak everywhere to start withBoiler needs powerflushing, vaillants are an arse for collecting debris and collecting in them poxy little tubes. I wouldn't advocate squeezing the black rubber tube inside the casing to hard as i did this once and really shagged it up, took me a solid day using ds40 and a kamco powerflush to clear it.
Really, I don't think I've ever had that problem and I have installed well over 1000 of them over the years, that's including power flushing them with 'scalebreaker' on various 'local authority' contracts. Mind you they were new boilers....Just to make sure it's that but I wouldn't power flush a Vaillant they leak everywhere to start with
If Hoses are blocked , better to replace them with the upgraded copper ones.
do you just make your own?There silly money, I just replace them with new rubber.
do you just make your own?
No, genuine Vaillant replacements.
Thought they had stopped doing the rubber ones !!
matt, what would this prove?Try turning cold into the boiler off and see if hot tap still runs
matt, what would this prove?
What do you mean by the pump seals had gone? And how could you tell?
Did you check the plastic filter that sits in the brass manifold, directly behind the low water sensor? It always blocks and causes hot water issues.
You'd need to remove the low water sensor and flow pipe from the primary heat exchanger to get it out.
Part number is 179030 i think... But might be different for different Ecotec models?
Plastic filter had degraded, I think that was what started the blockage in the first place.
The canoe filter, in the bottom left by the hw hex.
Reply to the thread, titled "Vaillant ecotec plus 831 problems" which is posted in UK Plumbers Forums on Plumbers Forums.
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