No hot water from tank - vented system

Joined
9 Jul 2022
Messages
7
Reaction score
1
Country
United Kingdom
My mum rang me last week to say she was without hot water, so I popped over at the weekend to check it out. She has a WB Greenstar Ri boiler, and a 3 port valve running up to a vented cylinder. It seemed to me like the hot water was stuck in a loop sending it to the pump and back to the valve again. Pump was overheating and making a noise. Overriding the valve seemed to solve it so to me looked like the culprit. Told her to get a local lad in and get it swapped out. She rang someone the next day who came out that evening and said he knew exactly what it was, quoted her a higher price than I'd expect but shes not one for ringing around so said yes and he came back next day to do the work. Didnt go to plan, he replaced the valve, but the water wasnt reaching the cylinder still and she said he spent several hours there trying to sort it. In the end told her she needed some more new parts at more cost and would come the next day.
I rang her the following evening to ask if it was fixed and she said he had added more parts and was still not working so had gone home after another half day after telling her the system probably needs a flush for £200 and if its not that then she probably needs a new cylinder. He said the heating works fine (doesnt the hot water have to pass through the cylinder to get to the rads?) Water tank in loft is fine and cold water is getting to it.
Now I have no problem with professionals earning a living, thats why they get certified, but hes replaced several parts now obviously at marked up prices and still not fixed the problem and yet wants another £200 to try yet something else without being 100% sure.
Anyone any idea what the actual problem could be, I know without looking at it person its just pot luck having a guess but the bills racking up now and at this stage I have no idea if this lad knows what he's doing. I rang and spoke to him and he's confident a flush will solve it but if it doesnt its more money to buy yet more parts... Seems like he's guessing more than anything or is it perfectly normal to just replace everything along the chain until there's no old stuff left :)
Forgive my ignorance lads, I havent had to deal with heating engineers for a long time even though I'm in construction myself.
 
Sponsored Links
Has this suddenly happened do you know or has the Cylinder been slow to heat up for a while now?

Assuming it's a 3 port Valve you have, then the flow from the boiler is pumped to the valve, where the flow splits, one side to HW Cylinder, other to Central Heating, to allow independent control of both. Sudden failure of HW would point to Valve or Pump issue possibly, whereas gradual failure could suggest possible blockage in pipework.

Does the CH work if required, (appreciate not needed at this time of year, but without trying it, it's impossible to say what exactly the fault may be.)
 
He said the heating works fine (doesnt the hot water have to pass through the cylinder to get to the rads?)
No it travels along the flow pipe up to the 3-port valve and gets sent in either direction or both. Might be worth considering getting another engineer, if not to only get a 2nd opinion.
 
What do you mean by this... quote..
"Overiding the valve seemed to solve it"
What did you do ,and what exactly was the result ?
 
Sponsored Links
Has this suddenly happened do you know or has the Cylinder been slow to heat up for a while now?

Assuming it's a 3 port Valve you have, then the flow from the boiler is pumped to the valve, where the flow splits, one side to HW Cylinder, other to Central Heating, to allow independent control of both. Sudden failure of HW would point to Valve or Pump issue possibly, whereas gradual failure could suggest possible blockage in pipework.

Does the CH work if required, (appreciate not needed at this time of year, but without trying it, it's impossible to say what exactly the fault may be.)
He told me central heating works. I'm traveling down there again today to have a look at what he replaced. I cant answer you about whether it was a gradual loss of hot water over time but I will ask the question.
 
Air lock?
Sack the plumber he's not competent.
Going to check for an air lock today but I'd have hoped that he would have checked that already. Tempted to sack him tbh, but he will still want paying for work he's done even though he hasn't sorted it. I think a second opinion is needed but it'll be pot luck who to choose.
 
When you did this ,did the pipe from the 3 port valve that goes to the cylinder immediately start to gain heat ?
Yes it did, hence I left and told her to get it replaced. I’ve just got here again and he hasn’t replaced the 3 port valve, but he’s added 2 new air vents(?) on the pipe work to and from the boiler. I can’t even get the boiler to fire up now, the safety cut off kicks in so nothing even heats up anymore.
 
Is the boiler locking out needing resetting ,or does it not fire up at all??
Is the pump spinning ?
 
Is the boiler locking out needing resetting ,or does it not fire up at all??
Is the pump spinning ?
I’ve reset, pump is spinning but it’s only staying lit for 30 seconds then cuts out again. No hot water is even leaving the boiler anymore. Not sure why he’s added air valves. Mums clueless, she says he asked her what she wants him to do next and ring him after the weekend.
 
Basically, by the sound of that, he's drained the system, messed about, possibly found he cant get it to work again, drained again, added some air valves in the hope of bleeding it, (which may not have even been the issue), and given up because he is completely out of his depth.

The water is now no longer circulating anywhere by your description, it's trapped in the boiler hence why it is switching off after 30 seconds. Needs someone who knows what they're doing to fault find correctly and sort the issue, it's not difficult for an experienced person to do with a conventional Y Plan system.

As to your original post, no is it not perfectly 'normal to replace everything along the chain until it works', you use your knowledge to carry out a process of elimination to work out what is the issue. Then test to check, before replacing/repairing once satisfied of the issue. Those throwing parts at a problem end up in a bigger mess than they started in, and usually expect the customer to cough up for their mistakes.

I would get a second opinion from a Time Served Heating Engineer and go from there. Put up your Location, someone on here may be able to suggest a reputable Engineer who will see you right.
 
Basically, by the sound of that, he's drained the system, messed about, possibly found he cant get it to work again, drained again, added some air valves in the hope of bleeding it, (which may not have even been the issue), and given up because he is completely out of his depth.

The water is now no longer circulating anywhere by your description, it's trapped in the boiler hence why it is switching off after 30 seconds. Needs someone who knows what they're doing to fault find correctly and sort the issue, it's not difficult for an experienced person to do with a conventional Y Plan system.

As to your original post, no is it not perfectly 'normal to replace everything along the chain until it works', you use your knowledge to carry out a process of elimination to work out what is the issue. Then test to check, before replacing/repairing once satisfied of the issue. Those throwing parts at a problem end up in a bigger mess than they started in, and usually expect the customer to cough up for their mistakes.

I would get a second opinion from a Time Served Heating Engineer and go from there. Put up your Location, someone on here may be able to suggest a reputable Engineer who will see you right.
Thanks for that. Forum user @terryplumb very kindly offered to have a chat over the phone with me about her system. He's basically taught me how the system works and given me some good ideas to move forward with (Top bloke btw, many thanks Terry!).
I will ring the original guy back tomorrow and kick him off the job, it sounds like he's gone about it the completely wrong way like you say @Hugh Jaleak . If any members are near Bradford, West Yorkshire who would like to have a look at it you'd be more than welcome!
 

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.


Are you a trade or supplier? You can create your listing free at DIYnot Local

 
Sponsored Links
Back
Top