double check valve baxi 105he

[mikeberry83]

hi new to the forum basically looking for some advice on how to drain my boiler (baxi 105 he) to change the check valve i am confident in changing the valve but just want to know correct procedure in draining system and refilling eg which taps to shut off etc any help would be much appreciated thanks

 

[Riley]

Are you talking about the double check valve on the filling loop???

 

[Combileeds]

Hi mikeberry83,

Isolate flow and return on the tap rail. The draincock is bottom right hand side of the boiler, under/behind the pump near the PRV(its a white plastic nut with a spigot for your drain tube.)Make sure the auto airvent(on top of the pump is open). That should do it.

 

[dancinplumba]

Shouldn't be removing case unless you are GSR

 

[mikeberry83]

hi thanks yes check on filling loop and was going to drain same way plumber did once by opening up at a pipe near downstairs radiator and put hose out front door was just wondering what taps etc i shut off at the boiler or can i just turn main water pipe to house off and drain that way

 

[mikeberry83]

ps boiler is in the loft with no where to really drain it

 

[mikeberry83]

my plumber has just gone away for a couple of weeks so if this is to complicated is it possible to just take the filling loop off and use a couple of blanking plugs/nuts for the short term
it is basically filling itself up from correct pressure to in the red within an hour because of the failed check valve

 

[Riley]

Am I missing the point here ? Surely the check valve is to stop your heating water going back into the mains ??? Your issue will be with the isolation valve if it is letting by

 

[buckley plumb]

Am I missing the point here ? Surely the check valve is to stop your heating water going back into the mains ??? Your issue will be with the isolation valve if it is letting by

Seen so many cheap filling loops and they only have one iso valve so are fitted wrong. Check should be on cold main side but with the cheap ones you can't remove flexi if you fit correct ad check has no iso on it

 

[Riley]

OP stick a picture on

 

[tolly]

Hi mikeberry83,

Isolate flow and return on the tap rail. The draincock is bottom right hand side of the boiler, under/behind the pump near the PRV(its a white plastic nut with a spigot for your drain tube.)Make sure the auto airvent(on top of the pump is open). That should do it.

Then put a tub underneath the flow iso that's now leaking underneath the boiler :dead:

 

[plumben]

If your pressure is rising its not the double check valve but the isolation valve/tap on the cold water main

 

[gassafe]

If the boiler is in the loft then don't drain anything, just catch what comes out in a bucket!

 

[Billy Bob Bob]

predicted next post,how to dry out a wet 105 pcb,can see it happening,would not be touching iso,s under any circumstances ,though the op does need to sort this quick as the next thing to go bang on the 105 he if the loops failed is either going to be the EV or secondary HE Hex,think i would be calling in a gas engineer or this could turn into a expensive repair,BTW before the op comments,i know the 105 HE backwards,not wise to argue otherwise,heed my advice and get a pro in or post in our need a plumber/GSR engineer section

 

[Dotty]

Therefore job 38.11.