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View the thread, titled "Megaflo / Vaillant / Nest not producing hot water - help!" which is posted in Central Heating Forum on UK Plumbers Forums.

E

ERJones

We have moved into a house which has a system involving a Vaillant boiler, indirect Megaflo and Nest. The Megaflo has been producing the hot water since we moved in (which we didn't realise) but the fuse blew the other day. We've now replaced the fuse. The boiler engineer was able to 'boost' the hot water from the boiler to fill up the Megaflo via the Nest, and by locking the two-way valve, but that hot water has now run out and we can't get the boiler to fill the Megaflo again. The Megaflo itself also doesn't appear to want to produce hot water. Clearly something has gone wrong somewhere (the Nest isn't telling either to produce hot water?) but we're a bit stuck. Any advice would be welcome on whether there's something simple we're missing, or do we need to get an engineer in (in which case, what kind as neither the boiler engineer nor the electrician seemed to really understand the system). Thank you!
 
Can you post photos of the unvented cylinder and the 2 way valve the plumber has locked open? When you say fill up, do you mean heat up?
 

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Megaflo / Vaillant / Nest not producing hot water - help!
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