The noise is continuous with the CH being on, turn on a tap and its stops, turn off the tap and it starts. Switch to HW only and its stops. The frequency of the noise is also constant.
Still keepin' the auld 28 going but it's getting noisy when heating the central system; quiet, almost silent when heating water. I suspect the pump is on the way out. Any suggestions on how I check? Would be much obliged for any input.
Thanks for all the input already, but the problem continues and with autumn approaching needs to be fixed. The functioning of the diverter valve appears to be the root of the problem. The diverter valve has been serviced - the spindle now moves more freely. Although there was some water...
I am also ordering a diverter front section as apparently it can be very difficult to get out the old seal without breaking.
Read more: https://www.diynot.com/diy/threads/vokera-leaking-divert-valve.256475/#ixzz5FNbcnWK1
Any chance it could be a sticking non return valve on the outlet of the primary return from the plate HE? Agile Tony has written for another thread that this could also give the same symptom. I'll start with the diverter valve first however. Thanks for all the replies. A grateful kjmcdow
When we turn on the hot water tap the boiler fires up but instead of water coming out of tap being hot (its lukewarm at best) the radiators start to get hot. I suspect that water heated in the combustion chamber is not being diverted to the secondary heat exchanger but instead circulating in...