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Think about the flow and return pipes to main hex,oxide sits nicely in hoses and if sqaushed it will fall into plate hex after a little while. Had loads as engineers squeeze to make work which is naughty!!

Cpuld be that the engineer squized the flow or return hose and a lump of oxide got into plate

It says you dont need pump supplie,/no perm live

Poor circulaation though plate hex,could also be blocked rubber hoses

Hi i will tell you now that you must wire pump at boiler , i know it says not required but i fitted a glowworm energy which is the same heat ex and design, didnt wire pump to boiler which meant it overheated regually. engi eer came out and said run pump wire to boiler to sort as soon as i did...

Good shout about foam nice and easy fix

Remove gauge and fit icons/isar gauge as hole is different size,that's all I do

Check if you have scale reducer on cold by boiler as I have seen loads cog up,or check cold supply to boiler isn't cogged up. Also cut hot pipe under boiler to see what pressure is like.hope this helps keep us all posted

Over heating issue maybe but pay the manufacture to sort unless you have a engineer that is happy to work and fix these boilers. I'm not a fan as they leak all the time and cut your hands changing parts Good luck

Thanks I was going to fit machine straight on flow and return I've got an immersion heater as doing any flush cold is a waste of time. Thanks for feedback

Hi people hope all well,maintaining a number of boilers and got a vaillant heat hex kettling as I have sorted system out but just wondered if I can clean main the main hex? Due to the micro bore style water ways I'm unsure if it will bypass or if can soak with liquid or use fernox ds40. Any...

Sounds like it was wired up on switch live ,ESP if you had to run new wire,get the wiring checked as this doesn't sound like a boiler fault,,boiler will only come on if a signal is sent from controls.sadly not all engineers can sort heating wiring,but don't get to stressed with boiler.good luck

Thanks just had reply from bunnymann,is it fitted to a tee style fitting as it looks in the book internal hence why I asked if it was the same fitting?

Hi just wanted to see if anyone could confirm if the low water pressure sensor for heating on the new Eco tec pro is the same as the heating low water pressure sensor on Eco tec plus etc,the reason I ask is I can't find the part number as looking in the book it's on the return by the heat...

Get your electrician to check switch live/heating wires in wiring centre if you have an rf stat it may be sending voltage back even in off position,due to the relay in reciver.

If it was me get the guy back who done power flush get an immersion kit set up and cut in to flow and return pipe work --- this removes the need for the boiler. I just don't understand why people flush with out immersion as it confirms proper heat to a rad. I my opinion flush cold is like...

There should be a copper pipe out side see if it drips maybe expansion vessel needs pumping up and pressure relif valve replacing?the boiler could be running dry

Looking at wiring centre what is the wires going into terminal 1?also with so many blues surely it needs sleaving on them to work out what is what?

Hi team hope all well I will be fitting some intergas combis and just confirming what to fit on the cold side for scale prevention as I'm on the south coast, I am thinking of putting a tee and valves on he/cw so in future if it scales up I can clean boiler circuit. As I'm not 100% on the inline...

I always state a electric shower if it's an ensuite/second bathroom as at some stage a combi not matter output will fail atleast you have a back up for hot water and also very easy to replace if they fail. Don't put all eggs in one basket