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Okay. One problem solved. One to go. ONE radiator is stone cold. The rest are boiling hot and toasty. The rad concerned is upstairs and has a TRV. I have taken the TRV off and the pin inside moves freely up and down. I've actually left the TRV off for the time being just to be on the safe...

Gas4you. Thank you. The guy who fitted the system actually advised me to do it that way. And he was Corgi registered. The fool! What position should the two black levers be in during normal use please? You see, in order to top up the boiler I only have to activate ONE of them. I'm concerned...

Bahco. Thank you. I'll let you know how I get on. KD.

Hoping somebody may be able to help. I have a Vaillant boiler which is about 3 years old. Just before the winter kicked in I drained down the system as my installer had shown me (switch off boiler, twist red release knob under boiler until water begins to drain out and then open bleed valves...