heating only rads hot upstairs

[jas]

i have the problem of no heat downstairs. boiler is quite loud and always give a loud bang when it fires up kettling and probably sludge?
pump is also loud sometimes can hear water being pushed all the time or air with water (like a swishing noise) bled air from the system but still persists,

have also tested the pump L+N for resistance, get 250 ohms when system live, if i isoate the electrics (turn the fused spur off) i get 245 ohms. on a previous thread it is stated 150 -300 ohms is correct.

indirect heating, 2 x 2port valves, sealed system, system boiler, pump located within boiler. 2 port valves seem to working ok, can hear them working and let by and stop on my demands


i have read on a website that if u remove the vent plug and water pours out of the pump then pump bearings are worn out. mine does this so should i replace the pump?
any one have any ideas please

 

[Paultheplumber]

This really does sound like the pump isnt working water will come out anyway regarless of the bearings being worn can the blades be rotated freely.turn the boiler off isolate the boiler at the flow and return if the jig has this and remove the bleed screw from the pump using a flat head screw driver see if you can rotate the blade it could just be jammed.

 

[jas]

well i have taken the pump head out , yes seems to move freely. the other website says that water should only seep out when u undo the vent screw but mine pours outs

 

[Paultheplumber]

Right I see it sound like a new pump is needed the kettling is probably because of the water not being pumped out of the heat exchanger so it is over heating. The upstairs rads getting hot because of the hot water rising in the system it all adds up to that really

 

[dick999]

it is the pump, check the pump if it is overheating a good working pump will have a slight hum.

 

[pnhsolutions]

remove the bung from front of pump, put screwdriver in hole and see if it is spinning! This is not always a true method of checkin pumps as the impeller can sheer form shaft, therefore shaft will be spinning and impeller is not! i was caught out by this a few years back! good luck

 

[leakylea]

pump should be about 350 hms, all the simptoms of pump failure

 

[jas]

isnt 350 ohms to high, thought ideally it would be between 100 -200 ohms

taken the pump of and have taken it apart seems to be quite a bit of metal shearings in the body around the rubbers on the shaft and impeller.

cant really check if it is spinning, when i take the bung off water pours out, fast aswell

also if i was to flush the system how would i isolate the hot water side?

 

[Plucky]

Change the pump!

 

[desrob]

hello derek here sounds like you need a new pump dear chap

 

[PJE1098]

The loud bang when boiler fires is usually caused by wrong gap size on ignition electrodes, hence delayed ignition...IDEAL ISARS are famous for it.... Educated guess you have a drop feed system which requires properly bled from a point which is higher than the pump, then top radiators balanced.

Good luck..

 

[jas]

dont think it is drop down, pipes run under the floor boards downstairs to each rad