Cold radiator - help undoing Danfoss TRV PLEASE??

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These Danfoss TRV's are bidirectional but you have to select the direction on the top of the valve body depending on whether the valve is on the flow or return side of the rad. You will see on the right hand side of the valve itself(once you've taken the head off) a small black vertical line and on the top of the valve where the pin is you will see a small black arrow.If the valve is on the flow side of the rad the arrow has to line up with the black line and point upwards(i.e. flow is into the rad) and if the valve is on the return side the arrow should point down to the floor. Got that?

Might not be helping if it's currently the wrong way round.
 
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