Hi,
My hot water cylinder heats as it should when the hot water is on, but also heats up when the hot water is off but the heating is on.
I have a maintenance contract and the guy came and fitted a new actuator (the old one was working anyway), freed off the valve that the actuator clips onto (by working it off/on with pliers), and when checked it seemed ok. A couple of days later it's back the same. I've verified the actuator moves according to DHW settings, and the valve seems fairly free to move using just my fingers, and moves maybe a little more than an eighth of a turn. Obviously I can/will phone them out again but it's a bit of a pain to plan being in all day. Now the sceptical part of me says maybe the valve should have been replaced on the first visit but maybe the guy was being lazy and couldn't be bothered draining the system, so I'd like a little more knowledge before calling them back out. So...
Is the valve ok, ie should it move more than an eighth of a turn?
Would it require a (partial at least?) drain down to swap it over?
Should the pipe "after" the valve be warm when the valve is closed? (I understand some heat will pass up the pipe, mine is a bit hotter than that).
System is about 14 years old, gravity fed from small tank in loft. It was flushed and inhibiter added (by me) about 3 years ago. Rads were also removed and flushed with garden hose - no crud but a little black water. House is on two levels, cylinder in upstairs cupboard.
Thanks for any help
My hot water cylinder heats as it should when the hot water is on, but also heats up when the hot water is off but the heating is on.
I have a maintenance contract and the guy came and fitted a new actuator (the old one was working anyway), freed off the valve that the actuator clips onto (by working it off/on with pliers), and when checked it seemed ok. A couple of days later it's back the same. I've verified the actuator moves according to DHW settings, and the valve seems fairly free to move using just my fingers, and moves maybe a little more than an eighth of a turn. Obviously I can/will phone them out again but it's a bit of a pain to plan being in all day. Now the sceptical part of me says maybe the valve should have been replaced on the first visit but maybe the guy was being lazy and couldn't be bothered draining the system, so I'd like a little more knowledge before calling them back out. So...
Is the valve ok, ie should it move more than an eighth of a turn?
Would it require a (partial at least?) drain down to swap it over?
Should the pipe "after" the valve be warm when the valve is closed? (I understand some heat will pass up the pipe, mine is a bit hotter than that).
System is about 14 years old, gravity fed from small tank in loft. It was flushed and inhibiter added (by me) about 3 years ago. Rads were also removed and flushed with garden hose - no crud but a little black water. House is on two levels, cylinder in upstairs cupboard.
Thanks for any help
