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Drained the system to fit a new non return valve. Refilled system and bled rads, all upstairs ok. hall and Living room ok but Dining room stone cold.no air in rad. Checked thermostat pin moving ok.Pipes to Dining room rad luke warm.

Main burner wont light. I have replaced thermo coupling. I have noticed pilot flame is low . Cleaned pilot supply pipe. When I turn burner on pilot light goes out.