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Fan motor... If the fuel and pump is disconnected, you can fool the photocell to allow it to run longer. The photocell needs total darkness then light when it's supposed to fire. I.e the click of the solenoid. I'm not familiar with your model. It this may be possible with a finger...

I'm guessing the buzzing is the fuel solenoid opening fuel line, then due to photocell seeing no flame, lockout. So you will problaby be getting a small amount of fuel dribbling out the nozzle. It really doesn't sound healthy, my guess would be the motor(fan)

Boiler manual States 22mm flow and return, no mention of using 28mm. So....where has the 28mm come from? http://www.worcester-bosch.co.uk/cache/file/444/installation-and-servicing-instructions-for-greenstar-i-system--manufactured-from-jan-2013.pdf

Looks like part of a tap!

Looks like a flue to me. Could it of fed a room below?

Did a 5 year old do it?

The system isn't supposed to circulate through the tank. It's just there for 'feed and expansion'

Most likely the glow plugs, most common cause of non starting when very cold. Best to replace them all.

I know, I know. I got away with it a few times and I got cocky.. :P

I think Claire believes what she is told about the seals. I don't believe it myself. Op has stated its a unvented cylinder.

Ah..well you need a new un pumped shower then. Although if it was me, I would take the cover off and disconnect the pump from inside and see how it goes.

I had a brand new one that was passing, I will admit it was me using it to drain the system .. :oops: I stripped it down, found a bit of grit on the seat. Now working fine.

Good work..!

Ok, great. So yes, basically the heat link will replace your wireless stat receiver unit.

Is it a rm cylinder? I fitted a 210l s/s a while ago, 22mm compression fittings, a pleasure to install.

As you have a wireless thermostat, you will need to plug the nest into the supplied adpator. This is to charge the internal battery in the nest. If you had a wired thermostat, the original thermostat wires are used to power the nest from the heat link via 12v.

I'm sure your right on the 25mm. It's a UV hot water cylinder. All my experience is in vented cylinders and pumps in 22mm. I don't know what aqualisa recommend for the feeds.

I don't know without looking but I'm pretty certain it's 22mm to the tank from the mains. It's a new build.

I believe in doing things properly, each with there own supplies form 22mm feeds. But to save time and money, I would prefer to take the easier option if it will work. :P

Ermm...why is the old thermostat still connected..?