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I got all these radiators working, my mate used a hammer drill with a rubber tip against the TRV pipes with a block of wood behind them and it cleared each one within a few minutes of off and on hammer drill action. Doug

I moved into a house with a Greenstar 15i boiler (open vented) it has 12 radiators on two separate switchable circuits 7 upstairs and 5 downstairs all have old Danfoss TRVs fitted. When I first tried it a month or so ago it had 3 cold radiators upstairs and none downstairs, I then turned some of...

I have the same back boiler and had the same problem with the resistor burning out, the valve works on 120V AC and the resistor was used to drop the mains voltage down. I just used an external 240v-120v 1 Amp output transformer and used this to power the valve, it has been working like this for...