Vaillant Ecotech Plus Diverter Problem after code 75 sorted? CH on when call HW, water only warm.

[SBS]

I'm after a little advise with a Vaillant Ecotech Plus. We had a Code 75, Pressure sensor replaced, no change. Pump was vibrating every 20 seconds or so on start up, but engineer said it was faulty, new pump fitted. OK code 75 has gone. Customer has now reported the the heating is on all the time. I have found that when there is a call for hot water or the "C" Warmstart System is active the rads get hot and the hot water is not that warm. The diverter valve is not leaking, but if i manually pull the plunger out more you get hot water. New diverter was fitted. Still the same problem, engineer said there could be a blockage in the plate. This was taken off and looked clear. I'm reluctant to pay any more money out as I've been told it could be the board. Do you have any ideas.

 

[king of pipes]

Good luck with it

 

[Scott_D]

@ShaunCorbs

 

[ShaunCorbs]

OP are you gas safe ?

 

[SBS]

OP are you gas safe ?

The gas engineer is who has done the work.

 

[Harvest Fields]

If I were you I would get him back out again.

 

[Chalked]

Dubious post. Ar you registered gas safe ?
“Customer says”, in one sentence.
“Engineer “ did this, in another.
If “I” pull the plunger in another
Then I’m not pay invoice any more.

I could be wrong but this looks like a diy repair.

 

[heatservice]

Rads getting hot when preheat turned ON might suggest auto bypass stuck open.

 

[dan_the_plumber]

Blocked primary filter