Heating Engineers/Plumbers? - Heatrae Sadia Megaflow Pressure Question

[Toms306]

smell in the bathroom is probably damp from the shower tray leaking around the tray top seal i guessing your spending hours in the shower scrubbing

Not when it uses 8 litres of water a minute lol! 5 min shower in the morning, that's all.

I 'think' I've found the smell issue though, not sure why it's only now starting to smell but seems to be the basin overflow, smell seemed to get stronger after using hot water there so guessing it's breeding something in there. I haven't been using hot water there due to a faulty tap and this pressure issue but since replacing the tap headgear it is now useable so that may be why. Sprayed some cleaner/anti-bac down it and left overnight and can't smell it this morning.

If you're turning the relief valve and nothing is coming out there's no water getting to the heater

I could be the non return valve is faulty or the strainer is blocked.

Is the service valve feeding the heater fully open?

Tbh you shouldn't be touching any of it, unvented water heaters can cause catastrophic damage if they're done wrong.

Whole schools have been blown apart by faulty unvented water heaters

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Seriously of you don't know what you're doing with it I wouldn't be touching it.
When you saying replenishing the air gap worries me.

There is no air gap.

The expansion vessel is set to a certain pressure to maintain a constant pressure when you turn the tap on

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Also if there's no water getting to the heater chances are you've cooked it

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Can you take a picture of it to see what setup you have

There is an air gap. I've done research into the system, I'm not just going around poking things! Water is being heated. To recap the issue, it's been intermittently dripping from the overflow/tundish since I moved in. When using any hot water there is a pressure delay of up to 2 minutes before the pressure suddenly rises to full which is inconvenient, but I want to know if that's normal for the system.

This is the system - https://www.youtube.com/watch?v=1nnpwyDpExM

This is how to regen the air-gap - https://www.youtube.com/watch?v=sKvxlQI0fH4

is this in a rented property? If so just phone your landlord and they will arrange for an engineer to look at it.

Not an engineer, just a maintenance man that tends to do the same things that I could've done in half the time and without having to wait in all day for him.