Central heating problem with boiler and a pump. PLEASE HELP

[KrayonZ]

Hi all, problems started last night, heard a loud buzzing noise so i went upstairs and checked the HWSC, found out that it was a pump attached the a 22mm pipe running from the boiler downstairs which then split between the rads and the HWSC, it was also red hot! I then took the fuse out and isolated the electrical supply to the pump, let it cool down for a few hours before turning it back on and boom, worked perfect again, went downstairs and checked boiler as i noticed we wasn't getting any hot water and the over heat light was on, reset the boiler as it told me to in the manufactures instructions and worked fine for about 10 mins, then it came back on and when i tried resetting again and again it wouldn't go off. Turned it off and tried a few hours later and the over heat light went off but the pilot wouldnt light or anything, just the light to say the boilers on (Power is going to the boiler), It is a self lighting boiler. Turned it all off last night before going bed and turned back on again this morning and it was all working flawlessly, then tonight the pump is making the noise again and getting really hot.

Any ideas?
Many thanks.

 

[Puddle]

Sounds like you need a new pump

 

[KrayonZ]

I was wondering that, just wanted to make sure, but was wondering if the boiler overheat light would show even though its the pump that's gone?

 

[tamz]

If it is not pumping correctly the boiler will overheat

 

[KrayonZ]

Thanks, for help guys.

 

[KrayonZ]

Oh, one last thing, at the top and bottom of the pump it looks like two valves that you can connect a key to, to isolate the water between the two points, whats this called?

 

[SafeGasInstall]

isolating valves ,gate type

 

[PlumbBobBob]

you just need to close them to change the pump with no need to drain down the system.

 

[SafeGasInstall]

when u have closed them undo the screw on the centre of pump .if water runs continues from there DO NOT brake into the pipe work !!! Unless you are brave man

 

[KrayonZ]

They are gate type valves but without an head on so i cannot unscrew them? is there a certain tool or can i use a pair of pliers? & without turning them off i unscrewed the screw in the middle of the pump and no water came out?

 

[SafeGasInstall]

is your F&E thank empty

 

[bill577]

make sure you have water in the system, there should be a small tank in the loft about a quarter full of water, if there is water try bleeding a downstairs rad and see if the water level drops in the tank.

 

[fuzzy]

isolate pump, shut of valves, remove pump take to merchant swap n replce, job done

 

[SafeGasInstall]

pump is feed with 230V ac be aware that you know how to deal with 230V ac !!!! before start doing any work !