Open vented System:Glowworm ultimate boiler balanced flue.
Drained radiators. system would not refill from header tank. Backflushed and bled radiators .
Switched system on . Pump then began to run rough and boiler cuts out within a minute. Both flow and return pipes hot straight away. Checked flow pipe had water through the emptying valve.
No water seems to be leaving header tank via cold feed pipe
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