Worcester 28i rsf - hot water but no heating

[beesley121]

Got called to a house today, worcester 28i rsf, cyst has hot water but no heating. Pressurised boiler to 1.5 bar, no room stat, mechanical clock bypassed, pump runs and fan remains on. No attempt to ignite.

Cust says had power cut last night and when power came back on, heating wouldn't work


i think its pcb at fault, what do you guys think?

 

[Nostrum]

Unlucky but it happens, not at risk so don't worry. Top tip: close rad valves and remove a rad. Empty it, refit but don't bleed and open only one rad valve. Air in rad will act like an expansion vessel for a temporary fix. One closed rad valve will stop circulation so no chance of air moving about.

had a system run like this for 9 months before!

 

[buckley plumb]

Well OH hadn't tripped, replaced pcb all if fired up first titime only problem then was I noticed the pressure gauge was increase rapidly and was nearing 3 bar.
I checked the expansion with the view to pumpnit up only to find it was full of water

cust not happy they spent money on a new pcb and fitting only to find its knackerd. Explained that there was no way I could tell the boiler had another fault until the pcb was replaced

Explained to cust not to use boiler and asked th could I turn it off. Getting them a price for a new one and maybe fitting an expansion vessel elsewhere as the cust has no money !!

I'm unsure though if this should have been labeled an at risk. It's not a gas issue, nothing to do with fumes, all other safety features work but is the expansion vessel and prv included in this. All it would potentionally do is either blow off outside or flood the kitchen is they were to carry on using it

drain a radiator and only open one valve on it and use that as a temp exp vessel customer got heating and hw and is happy at no expense

 

[Nostrum]

And I thought I was a slow typer 🙂

 

[buckley plumb]

And I thought I was a slow typer 🙂

not as slow as me lol or could be my internet connection. must have been typing at same time