Wilo Gold 50 pump question

bayliner · Oct 10, 2014

Hi to all.

I have just moved into a new property, switched on the central heating and no heating or hot water. Checked the pump and it's boiling hot, can't touch it for more than second. The pump is a Wilo gold 50. I unscrewed the centre screw and the blades are spinning freely. I then noticed the valve entering the pump from above was closed, opened and heating all sorted. But the pump is still roasting hot, reading up I thought the pump would go warm as water is now flowing. I just want to make sure that no damage can come to the pump.

Also one of the rads furthest away from the boiler on the same level as boiler is not working, I have bleed the rad but nothing still cold, had same problem with another one but after bleeding it worked fine.

And finally one of the rad hisses like crazy to the point that it's very annoying, have tried adjusting the thermostats on the rad but it's still hisses, just sounds like air constantly traveling around the rad. Can I do anything to fix this, this rad is the closest to the boiler.

Rads are controlled via one thermostat on the wall.

Any help to the above would be great and many thanks in advance.

kind regards

Paolo

Best · Oct 10, 2014

Pump might be okay, but all you can do is try it & see. Do make sure the air is removed from pump by opening that centre brass screw while pump is off.
The rad that isn't working - it could be air in pipes - so turn all other rads off & run heat to try to push airlock out. It could also be a TRV pin stuck or faulty head. Remove head & tap pin a few times.
Noise in first rad might mean the lockshield rad valve is turned down too much & requires & slight turn anticlockwise.
The pump needs to be set at the lowest speed needed for your system - perhaps no more than number 2, but needs a heating guy to decide that.

kris · Oct 10, 2014

Hi there bayliner,,The valve that was closed was it one of the pump valves (attatched to the pump) and if so was it defo at the boiler side of pump ,
The radiator that you bled will just need the pin freed up, sometimes over the summer or long off periods the thermostatic valves off or 1 and when theyre opened back up the pin sometimes doesnt retract and the spring inside jams, its an easy fix , one that you can manage, depending on the make and age of the valve will depend how u remove the head , some you can screw by hand , some you need two hands to twist the head off, and some of the older ones come off with an allen key (3mm i think) or a flat head screwdriver , once you remove the head i usually press the pin in and out while giving it a tiny bit of lubrication to help free it up, i would say your valves are older judging by the hissing noise your describing and you could possibly replace ,

bayliner · Oct 11, 2014

Hi and thank you both. I am trying to post a photo but not having much luck. The valve was going into the pump from the top. The pump is upside down as the writing on the pump is upside down. As soon as I opened it you could start to here the rad upstairs creaking. I will adjust the valves on the rad and see if that gets some heat to it. As for the noise I will try and adjust the valves it in morning and let you know how I get on but again I think the valves are old and could do with being replaced.

pump is set to 2. I will adjust the thermostat on the boiler it's self as this is very high.

thanks again.

rpm · Oct 11, 2014

Regardless of what valve(s) were closed water pumps do not like running dry or against a closed head, hence the heat so you might wanna consider having a new one ready as winter is coming.