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Hi, looking for suggestions. I have a Bosch Oil Combi - Greenstar 25/32. When the heating is on and I turn on any of the hot water taps I get a shuddering noise which transmits through the pipework. It is not water hammer. As soon as I turn off the heating it doesn't happen. I replaced the...

I have an old Optma XL Burglar alarm. Prob is that the backup battery only seems to be getting 9volts from the unit instead of 12. This means that it cant do the job when the power goes off , so the alarm sounds. I am not an expert but I guess there is an internal transformer which is duff? Is...