Title says it all. I've noticed twice now that my CH valve has not closed when the HW is being heated. I had assumed that the CH valve should close as the HW one opens (give or take a maybe a few tens of seconds), and I have seen this on a number of occasions. I tested it this morning and that is what I got. But both yesterday and today afternoon that has not happen, the CH valve has remained open. Is this yet another artefact of TPI operation?
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