A friend has a Halstead Quattro Gold and about a year ago it started to lockout on the DHW side after the tap had been on for a while. He would reset the boiler but it kept locking out so he taped over the reset button which has been taped up for few months. The past six weeks has now seen him having to top up the pressure as he says it goes right down to zero every now & again & he has noticed a puddle outside under the the PR pipe. Any ideas as to what is happening & is it safe to tape over the reset button?