valliant turbomax vuw 242e no heating

[alexmurchison]

directed at any valliant service tech,s or plumbers. on the above boiler , fires up and immedieately the heating flow pipe warms then gets very VERY hot while the return to boiler stays cold ! soon after the boiler stat climbs to 100C then blows off and cuts out. My 1st thought was diverter valve, to which he said was replaced 10 month ago. Seemed to have cured it then and lasted till now, another plumber came out about a week ago, and fobbed him off by saying it was the circulating pump that had packed up, didnt cure it and he didnt come back!

Are the diverters on these models prone for packing up, plumb centrre seem to have a dozen on the shelf which to me indicates a regular part sold !!

Im an OFTEC engineer so usually stick to my oil boilers, but our gas man was busy so went, seen as its not gas related i can fit the part so not a problem, just wanted any other opinions before i charge the guy the £130 part !!

 

[JAH HEATING]

directed at any valliant service tech,s or plumbers. on the above boiler , fires up and immedieately the heating flow pipe warms then gets very VERY hot while the return to boiler stays cold ! soon after the boiler stat climbs to 100C then blows off and cuts out. My 1st thought was diverter valve, to which he said was replaced 10 month ago. Seemed to have cured it then and lasted till now, another plumber came out about a week ago, and fobbed him off by saying it was the circulating pump that had packed up, didnt cure it and he didnt come back!

Are the diverters on these models prone for packing up, plumb centrre seem to have a dozen on the shelf which to me indicates a regular part sold !!

Im an OFTEC engineer so usually stick to my oil boilers, but our gas man was busy so went, seen as its not gas related i can fit the part so not a problem, just wanted any other opinions before i charge the guy the £130 part !!

without looking at it, first thing that came into my head was the pump ?

all your valves on boiler/ rads open ?

 

[alexmurchison]

Hi thanks JAH heating, yes all rad valves open, like i say, the flow pipe becomes hot, from the boiler then up the wall to second floor but doesnt even reach the first rad before losing its temp, so to me water not flowing ! The circ pump was replaced last week so big shiney new pump, which yes i checked is actually working, never cured the problem apparently and the guy who fitted it never came back. The pump itself is warm but not overhating, the secondary exchanger is warm so, most parts on the flow side are in operation as would be expected. But return pipe stone cold, also checked setting on pump, its on III so full power

 

[JAH HEATING]

Hi thanks JAH heating, yes all rad valves open, like i say, the flow pipe becomes hot, from the boiler then up the wall to second floor but doesnt even reach the first rad before losing its temp, so to me water not flowing ! The circ pump was replaced last week so big shiney new pump, which yes i checked is actually working, never cured the problem apparently and the guy who fitted it never came back. The pump itself is warm but not overhating, the secondary exchanger is warm so, most parts on the flow side are in operation as would be expected. But return pipe stone cold, also checked setting on pump, its on III so full power

Sounds like it could be blocked mate ?

Throw a hose on it, see what the condition of the water is like ?

 

[alexmurchison]

yes, thanks think it would be wise to try your method first, could still take a few parts with me and strip down / clean etc, i think there is a service kit for the diverters, im not sure if it had ever been flushed through when it has had previous work

 

[diamondgas]

Are you getting plenty hot water alex? That'll rule out the pump Did the guy turn the iso's back on fully? If you suspect the valve is stuck in h/w position remove the pump and you'll see the valve diverter. At rest it sits on the bottom, turn a hot tap on and you.ll see it rise up!If it's stuck to the roof of the housing then you'll know its deffo the valve. You can get a service kit for the diverter valve, by-the-way, much cheaper than the whole valve. Can't say I've ever had one stick in hot water only position to be honest

 

[alexmurchison]

Are you getting plenty hot water alex? That'll rule out the pump Did the guy turn the iso's back on fully? If you suspect the valve is stuck in h/w position remove the pump and you'll see the valve diverter. At rest it sits on the bottom, turn a hot tap on and you.ll see it rise up!If it's stuck to the roof of the housing then you'll know its deffo the valve. You can get a service kit for the diverter valve, by-the-way, much cheaper than the whole valve. Can't say I've ever had one stick in hot water only position to be honest

Ok, to be honest i never asked but im sure he said that since the heating stopped working he had switched the boiler off. I just rang him to ask, but basically he said he had spent the best part of £800 on it repairing it. He is now going to get a new boiler fitted so at least parts / labour warrranty.

Shame really, as i would of liked to have had a look at the possible problems.

 

[diamondgas]

I think I'd have had enough after £800, depends if that was over it's life time or not though

You know when you've been at this game a long time when boilers you use to install are now well past their sell-by date ... lol