Problems after replacing Pump and 3 port valve.

[Sullyg]

I decided to replace the pump because the radiators downstairs were cold and the pump was noisy.Another problem was , i could hear a clicking sound from the 3 port valve (danfoss) and when trying to switch it manually the lever was very stiff and hard to move.
So i drained the system and replaced pump (grunfoss) and valve.i then refilled the system and bled ,downstairs first.The boiler came on for about 5 mins then stopped. the pipes going in and out of the pump were hot but after that, they are just warm .I also noticed that when i switch the CH and Water off at the programmer the pump keeps running , is this normal?.
Now the boiler doesnt want to fire up.

Is there a special procedure to bleed or replace the 3 port valve. I asumed it was a simple replacement like for like. Electrically it seems to work ok.
Ive replaced the pump before some years ago with no probs so i assume it must be something to do with the valve.
Many Thanks..

 

[lufcmark]

Have you bled the pipe work above the pump in the cylinder cupboard?...Boiler probably has a pump overrun on it which is why the pump still runs for a few mins after demand has ceased.

 

[Sullyg]

I think ive bled the whole lot...

 

[seco services]

how longs the pump running for or is it not stopping at all ?

 

[lufcmark]

Aswell as venting the rads you need to vent the pump/pipe work above the pump in the cylinder cupboard (if thats the set up you have)...

 

[Sullyg]

Ill drain it down tommorrow and try again. Fingers crossed.

The pump wasnt stopping after i switch off at the programmer.I didnt leave it too long(5-10 mins maybe) because i thought it was a problem, i had never noticed that before.So i switched off just in case.

Is there a certain position for the 3 point valve when draining down and refilling?

How do you bleed the pipework above the pump?

Thanks..

 

[lufcmark]

Don't waste time draining down again...Take a look at the "Air Lock in Central Heating - New TRV's Just Fitted" thread currently on page 2 and in particular KevPlumbs posts where he has included some photos that show what I have attempted to describe.