vokera boiler, no heat upstairs ,fine downstairs

grand will do , also the pipework seems to be a very big bit iffy, never noticed before but the c/h outlet from the boiler pipes , should they all be going into thermostat ends of rads, or does it not really matter? i have 4 going into trv ends and 2 going into the outlet ends im thinking that is way wrong been like that 10 yrs??
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Until about 10 years ago all TRVs needed to be on the flow.

The Drayton TRV 4 is by-directional and have a double arrow at 90° on the side to indicate they work either way round.

Many old ones will work if wrongly fitted but may bang as stey start to turn off.


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