Y plan can this /does this happen

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Calling for hot water only, rads get warm

Emersion heater is on .

Flow on port b appeared hotter than primary flow.

240 volts on white wire, 0 volts on feed to it from controls when isolated.

So is this just valve stuck In mid position, and is hot water cylinder acting like a thermal store.?

Anyway, three way valve now changed and am testing.

Poorly installed job really.
 
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Calling for hot water only, rads get warm

Emersion heater is on .

Flow on port b appeared hotter than primary flow.

240 volts on white wire, 0 volts on feed to it from controls when isolated.

So is this just valve stuck In mid position, and is hot water cylinder acting like a thermal store.?

no there should not be 240v on the white when hot water only is selected
240v on the white will drive it to mid position,you have a control problem
and yes heat will always move from hot to cold its physics
Anyway, three way valve now changed and am testing.

Poorly installed job really.

good luck with that
 
Sorted, just valve stuck and end switch closed.

Fitted new valve all well,

Obvious really, think must be suffering with ****up weekend :oops:
 
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