Complete novice: Baxi Bermuda/Grundfos/No heating after draining down system.

[Roger44]

Hi all,

I've just replaced my grundfos pump with a new grundfos ups2 pump which is situated next to an old smc comet 2 controller. Before fitting the pump I had to drain the system down as the shut off valves either side of the pump weren't working correctly. I have now refilled the system and bled all the air ( I think ) out of the system by bleeding all the rads and bleeding the two tall pipes that are situated next to the immersion tank. I have also been up into the loft to check the small tank is full and it is. Now, the problem is when I turn the switch on the control panel to hot water only the boiler fires up and after about 2 minutes stops also when I turn the the switch to hot water & heating there is no power to the grundfos pump. Any help much appreciated!

 

[kris]

Pumps not coming on so it's over temperature. Check your wiring or call a spark.

Welcome to the forum Roger.

 

[lame plumber]

best call a good plumber as theres probably an airlock as well, and he can sort both issues at the same time.

 

[Ermintrude]

Open nut on pump let water run out for ages. Connect a plug to it.

 

[lame plumber]

Open nut on pump let water run out for ages. Connect a plug to it.

FLOOD FLOOD FLOOD ssssssssssssssssssssssssssssssssssssss bang when the fuse goes eventually

 

[Ermintrude]

FLOOD FLOOD FLOOD ssssssssssssssssssssssssssssssssssssss bang when the fuse goes eventually

Spoil sport. It's probably in side of fire or under floor so water will just run away. Set pump to constant flow

 

[happyflyer]

He will have vented it by now sat in front of nice warm radiators, don't need us lads now. He will
come back and tell us how to do it.....it is nice to know if someone gets a free fix from here.

 

[zzzjim]

How much sludge when took pump off , or BG will sell a nice powrer flush !

 

[Roger44]

Hi, Many thanks for all your thoughts on this matter! I managed to get it going in the end. well sort of..... I have managed to get the pump going all it was was a sticky switch on the old smc programmer. Anyway new problem now. This system has a myson smc 2 controller in line with the grundfos pump which has 3 speed settings on it I have no idea what it is but I Imagine it acts like a zone valve but then again I could be wrong as it just looks like a second pump? I have heating but now I have no hot water and I only get hot water by having the immersion on. Thanks in advance!

 

[happyflyer]

Come on lads sort it!!!

 

[Ermintrude]

Sounds a mess. Pumped ch and Pumped DHW ? You need a Y plan setting up with bbu NOT and S Plan!

 

[zzzjim]

Try re-visiting your "tall pipes beside immersion " for a bleed , beyond that may be sludge has moved about

potentially compromising some of few safety features it has ... hence need help for safety .

( unless I'm wrong ? )

 

[Millsy 82]

Photos?

Have you got 2 pumps together? If so rip them out change to a y plan. But get someone who knows what they are doing otherwise you will have a few problems.