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PostPosted: Sun Aug 19, 2018 2:13 pm 
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Hi all

Having just made a repair to a open vented system pipework, I have refilled the system, added inhibitor and bled the rads. However, now the boiler (Potterton Suprima 50L) locks out every time heat is called for.

I can't see any other bleed valves on the CH pump or on the boiler itself.

Any ideas?


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PostPosted: Mon Aug 20, 2018 1:43 pm 
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Check you have bled the pump and that the pump is spinning/circulating properly.

It could be air locked and overheating duewto lack of circulation.

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PostPosted: Mon Aug 20, 2018 6:15 pm 
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Have you checked that there is water in the header tank (fill and expansion tank) in the loft, it'll be the smaller of the 2 tanks in the loft.

Also check the operation of the ball valve, they often seize. Whilst you are up there check for a build up of sludge, if it's bad then clean the tank out first.

Next, boiler off and move the lever on the 3 port valve (if there is one) to manual and lock it there.

bleed all downstairs rads, followed by upstairs rads. You may also have one or two vents in the loft, these normally automatically vent out any air but can seize over time.

Next remove the central screw from the pump (20 pence coin normally fits) then refit.

Boiler back on, you may need to bleed the rads another once or twice. (same with any vents in the loft)

Oh... and don't forget to add the inhibitor to the header tank... I should have mentioned that earlier.

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