Potterton Suprima boiler fault or airlock

[Dave197616]

Hi,

I have just changed my 3 way divertor valve and have drained and cleaned the system using a CH cleaner refilled and bled the system using the radiator bleed valves, HW tank air bleed and pump screw bleed. I have an open vented system with a Potterton Suprima 50L bolier which was installed in 2006 in a new build house.
Problem is on start up and trying just the HW system first the boiler starts but exhibits a green and orange flashing light before after about 10 seconds stopping displaying a red light. If I reset it just does the same. I can hear the pump working but believe it may be an airlock in the boiler as the pilot doesn't even try to light. I have tried what appears to be everything and even tried running heating but still no joy.

Would this be an airlock between the boiler and the pump as I have noticed what appears to be a drain valve above the boiler with a hose connection and a nut and knurled nut fitting on the other pipe but if I open either no water or air flows out so am rather confused.

I was thinking about connecting a hose to the downstairs radiator and forcing water the opposite way to clear an airlock but am concerned this may not work.

Please can anyone offer any suggestions that may fix this problem

Thanks in advance

Dave

 

[ollski]

does air come out of the vent points?, easiest way is to keep stalling your pump and then bleeding the air from the system air vent

 

[Dave197616]

Hi,
Thanks for your reply.

No air comes from radiator bleed valves only water and no air or hardly any water from pump screw however after about 5 boiler resets bits of air come from the HW tank vent. Are you suggesting that I keep resetting boiler and restarting and keep bleeding the HW tank valve and if so should I do this on HW only to limit further airlocks. Would this harm the boiler or would it cope with this..

Thanks again

Dave

 

[ollski]

The hw tank vent will be the one to clear it. On a grundfos you can stall the pump for a couple of seconds by turned the speed selector between 2 speeds, sooner or later the air will rise through. I leave both circuits open

 

[Dave197616]

Sorry to ask but how long would air leak take to clear and out of interest if I engaged a plumber how would they clear the air lock in a faster time. Would you say it was 100% a air lock.