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Hi No luck as yet I'm afraid, we bled the system and I regularly bleed the radiators of air but it still trips out once the hot tap is turned off.

I'm experiencing problems with my Potterton Puma boiler(4 years old). 1. After turning the hot water tap off, the boiler continues to fire,making a hissing boiling sound until the boiler trips out and extinguishes the pilot light. 2. If the boiler switch is set to ON (not standby) but the CH...