Hi asked to help a neighbour with poor or no heat in the rads,not been touched in around 20 years open vent system, so boiler fires hot water fine 7 rads half cold half just look warm. So took the heads off the trv’s and all around the pins was heavy verdigris (blue crust). So any ideas as I didn’t 5hink we had copper in the vicinity of the pins
Danfoss trv’s all have blue corrosion at top
- Thread starter RobTi
- Start date
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Baco flux comes to mind
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