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We replace the 4 AAA batteries in the copper tube for the watchman oil level sensor without any problems However, the new batteries do not last more than a few weeks - this has happened several times and the batteries are good (and from several different sources so it is not a bad batch)...

Thanks - are there not filters that need checking and does the pressure in the expansion things not need checking (what pressure shoudl the air be?)/

We had a sealed central heating and DHW system put in in 2006 with a new oil condensing boiler. Does the sealed system need maintenance by a qualified person? None of the people who service the boiler will touch it so it has not been looked at. I do periodically check the pressure relief...

How do we replace the interior light on the above dishwasher - ot want to call serviceman in for just a bulb and that is what the manual says you need to do.