Worchester Greenstar 28i pressure loss help required!

[liamconnolly]

Hello all,

I'm hoping for some help in diagnosing an issue with our WB Greenstar 28i JuniorMK4 (installed late 2011).

Over the last year the boiler had needed topping up every now and again, however in the last couple of weeks the boiler has been losing it's 1.5 bar over a 24 hour period, each day, requiring topping up in the morning.

Symptoms:

- Loss of full pressure over 24 hour period;
- Dripping from the external blow off, not rapid discharge;
- Pressure gauge jumps slightly and then resettles when hot tap opened;
- Prolonged running of hot top appears to drop pressure;
- Pressure climbs to 3 bar with heating only in use
- red bladder appears full of water with no air

Ive had an engineer out who hoped it was the PRV, but upon seeing the way thepressure was moving felt it was more likely a heat exchanger issue. To get some confirmation he called WB Technicalhelpline, who werent very helpful. Theirview was that it was likely the plate heat exchanger. Our engineer wasn’t convinced; and had seenthe more expensive heat exchanger fail more commonly.

I should note,he didn’t check the expansion vessel. Whenthe boiler was at near 0 bar, I connected my bike pump to the valve hoping toget a 1 bar reading, instead found the unit full of water.


What are thechances that:

1. This is the route of my problem (and that the heatexchange fine given above symptoms)?
   
2. The vessel just needs drained down and recharged?
   
3. The vessel needs replaced?

Thanks,

Liam

 

[Dotty]

What you need is a more experienced GSR.

And that's the only advice you'll get from this forum.