Refilling combi heating system help!

[niallhanlon]

I recently bought a house which has had the heating system drained and I need to refill it. I've read up on the steps to take however there's no water entering the filling loop. I've opened all valves/taps under the combi boiler and even taken off the loop but there's not a drop of water passing through. I can't see any valves under the sink or other cupboards. The mains water in the taps is working fine. Has anyone got any ideas? Do I need to take the front panel off the boiler to reach additional valves? I must have missed something!

Thanks,

Niall

 

[sm1thson]

if no water is coming out of the loop its a problem before the loop, not in the boiler. not to insult your intelegance but some valves are quite small and look like this -have a look again.

also the filling loops have taps/valves at both ends you have disconnected one end have you then tried both taps/valves? (not just the one you assume to be the in)

why was it drained down? -expect the worse to happen when you refill it -buckets on standby and a way of cleanly draining it.

 

[niallhanlon]

Thanks for the swift reply.

Yes, I've opened the smaller valves too but I'll try again later tonight. I also tried both taps on either side of the filling loop.

The house was repossessed and vacant, hence the system drain. It's a new-ish build (4 years old) so I'm hoping I won't have too much trouble with refilling it.

I intended on closing all radiator bleed valves except for one on top floor (it's 3 storey) and filling that way until full then going through process of turning on bolier to eliminate air, bleeding rads etc until I reach a stable pressure. That sound about right?

Do you have any pointers regarding refilling a sealed system? Adding inhibitor, steps to take, usual issues etc?

Any help is much appreciated!

Thanks

 

[sm1thson]

Im no expert (just a young DIYer), but what you say sounds about right (allthough i would fill the system then bleed the rads then refill rather than doing it with a valve off -less likely to get everything wet!), also blead the pump, and (as i found) there is an automatic air valve (AAV) that should get the last bit of air out of the boiler -but are often bust. blead asmuch as you can before turning on (then bleed again after its run for an hour and an week)

defo add inhabitor, i would probably run for a week then drain and refill first to get any crap left from before out, -but thats just my thinking i dont know what the pros think!