Gas Central heating water pump noisy?

This can be due to 2 faults. Sounds like the pump bearings are worn, or you have a pocket of air circulating around the impellor of the pump. You may have an air vent on the pump to clear this, but if you have vent it with the boiler off. It is not difficult to change the pump yourself if venting air does not make a difference. There mmay be isolation valves on either side of the pump which you turn off with a sloted screwdriver, then undo the pump unions and wriggle it out. You will spill some water that is held in the pump doing this. If there are no isolation valves, then turn off the water supply to the boiiler and then remove the pump.A new pump will vary in price, depending on the type fitted. Average price is between £50/60. A charge for servicing varies depending on the Service schedule for the boiler, so get a quote before having it done. Good luck.

Noisy Central Heating Pump

Central Heating Pump Noise

First answer given is very sound. In addition try turning down the boiler temperature. If the water temperature is too high as it enters the pump the water, due to the low pressure at the pump inlet turns to steam. This is know as cavitation. Only a small amount of water gets through and the pump can become noisey.

Secondly, if your have thermostatic radiator valves as a check put them all to fully open. If your heating water is very hot the valves will shut down and only allow a small flow through. This causes a whistling effect as the water is pushed through the smaller oriface. The pump could also be wearing.

Hope this helps

It may be a faulty pump, but it could also be mechanical noise.

If the pump, pipes or valves are in contact with a hard surface, that may be working as a sounding board and amplifying the noise.

Make sure that neither the pump nor any pipework are directly in contact with wood or brick. If they are, get a roll of the felt style pipe insulation wrap (the stuff about 6" wide) and put folded pads of that under the pipework etc. - anywhere it touches a hard surface.

If you get any clicks or creaks from under the floor as the heating comes on or shuts down, adding a turn or two of felt around each pipe where they go through notches in joists will also reduce or cure that.

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RE:

Gas Central heating water pump noisy?

I've got a problem with my gas central heating, the water pump for the radiators is whining really loudly but only when the boiler is heating the water and it's pumping very hot water.

I've bled the system of air, there is already fernox system protector in the system (about 3 years...

To replace the pump with a Grundfoss,renew the pump valves if req'd and to service the boiler you wont get much change from £160,if any.

Phone a local Gas safe registered company,they might give you a quote over the phone.

Is it a bell & gosset pump? I know some models have a clutch between the motor and the impeller of the pump..... the clutch looks like an X with 2 springs in it, some of the clutches look like a swirl (but these are really freakin old). It will create noise if this clutch is bad, and is cheaper than a whole new pump.

Bell & Gosset was the first brand to come to mind.....

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You have air in the system. All you need to do is get the air out. Depending on radiator types or the way the loops are run, there should be air vents in the system. Once you get t he air out, the boiler will quiet way down the the boiler wont cycle on and off so often. Also make sure the pressure is up in the system. Needs to be 12 or 15 pounds pressure in the system at start up. Look around for small vents on the radiators or piping to get the air out! Hope this helps! Good luck!!