by CakeBoy » Sun Dec 14, 2014 12:19 pm
Hi Nick. The pressurestat is at the top back right, accessible under the lid. It's a a squat cylindrical item sat on end, covered in a rubber hood. It has an adjuster on it situated under the rubber hood on the top end that requires a tiny flat head screwdriver. The pressurestat controls the boiler pressure and thus boiler temperature. He may be referring to that. Please note that adjustments should be tiny on the screw head.
You might wish to mark the position with a wax pencil and move it out then back a degree or two, never more than a tenth of a turn, just in case it is in any way stuck. This may free it up. You might also wait until it happens again, if it does so. I think attempting to free it up this way is better than hitting it, if it is the cause of the over pressure. In this circumstance, you could do it with the mains off. You may perceive no change of course if the problem is the pressurestat and it's intermittent, but it might just relieve any ongoing tendency to seize that might be the issue.
There is an overpressure valve on the boiler but this sounds more like the pressurestat, particularly in view of the seller's comments. Are you still able to contact the seller? If so, perhaps he or she could more precisely identify the thing that was hit and the frequency required.
Are you aware if she has been descaled?
Please do nothing unless you feel competent with live electrical equipment and you do you at your own risk.
Good luck.
www.CakeBoy.co.uk
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