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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Slow HW, slow rads, boiler clunking...
These problems may not be related... I have a Worcester Bosch Greenstar boiler (an early condensing combi) about 6 years old. For some months the hot water has taking about 3-4 minutes to come out hot, as if the pre-heated store isn't working. Timeswitch is set correctly, the boiler is not in ECO mode. Also, in the last week the rads have been taking a long time to get warm. The rads upstairs get hot first while the downstairs ones are still cold. The burner comes on for about 3 minutes or so then off for 3 minutes, so the whole house is taking hours to heat up. There is a clunking noise coming from somewhere inside the boiler. Any ideas? Pump? Sludge in the pipes - the central heating system is also 6 years old. Whihc should I check first? Many thanks! |
#2
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Slow HW, slow rads, boiler clunking...
wrote in message ... These problems may not be related... I have a Worcester Bosch Greenstar boiler (an early condensing combi) about 6 years old. For some months the hot water has taking about 3-4 minutes to come out hot, as if the pre-heated store isn't working. Timeswitch is set correctly, the boiler is not in ECO mode. Also, in the last week the rads have been taking a long time to get warm. The rads upstairs get hot first while the downstairs ones are still cold. The burner comes on for about 3 minutes or so then off for 3 minutes, so the whole house is taking hours to heat up. There is a clunking noise coming from somewhere inside the boiler. Any ideas? Pump? Sludge in the pipes - the central heating system is also 6 years old. Whihc should I check first? Many thanks! Check the pump is rotating - Remove the silver screw ( expect some water leaking out) and see if the shaft end is rotating. |
#3
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Slow HW, slow rads, boiler clunking...
wrote:
Any ideas? Pump? Sludge in the pipes - the central heating system is also 6 years old. Whihc should I check first? Sounds like a pump problem or other obstruction in the primary water flow. -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
#4
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Slow HW, slow rads, boiler clunking...
On Tue, 01 Jan 2008 13:54:36 -0800, jpcoetzee wrote:
These problems may not be related... I have a Worcester Bosch Greenstar boiler (an early condensing combi) about 6 years old. For some months the hot water has taking about 3-4 minutes to come out hot, as if the pre-heated store isn't working. Timeswitch is set correctly, the boiler is not in ECO mode. Also, in the last week the rads have been taking a long time to get warm. The rads upstairs get hot first while the downstairs ones are still cold. The burner comes on for about 3 minutes or so then off for 3 minutes, so the whole house is taking hours to heat up. There is a clunking noise coming from somewhere inside the boiler. Any ideas? Pump? Sludge in the pipes - the central heating system is also 6 years old. Whihc should I check first? Many thanks! I would say you probably have some flow but not enough. I'd suspect a partially detached impeller in the pump. Sludge is possibly involved but as the symptoms came on suddenly I suspect the pump. It is often possible to change the pump head as they are often big standard grundfoss units, held by 4 allen bolts and a big o-ring. -- Ed Sirett - Property maintainer and registered gas fitter. The FAQ for uk.diy is at http://www.diyfaq.org.uk Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html |
#5
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Slow HW, slow rads, boiler clunking...
Many thanks to all - it was indeed the pump.
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