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CH piping hot Plate exchanger very clean defiantly not blocked DHW flow switch 'actuator' diaphragm is sound (no splits) and the diverter valve is working correctly (stripped down and pressure checked -in DHW mode it doesn't leak back into CH circuit). But... I need to turn the kitchen hot tap...

Hi, bit of a problem with my boiler I wondered if anyone can help? No heating/DHW. When heating/DHW demand is switched on; pump runs, fan runs, but after sequence no spark then lock out comes on. checked ohms on airflow switch and that's working, test bung is in. Flue not blocked I have a...

Hi, not sure where to start process of diagnosis... Boiler is howling when started up. When I adjust the CH heat control dial (LH knob in photo) on front of the boiler for less heat it goes away. If I throttle back gas flow via isolator tap it goes away (gives less heat also) Not sure if its a...

Hello there, I wonder if any one could help me? I want to replace the pressure relief valve as over time it keeps releasing the pressure and I periodically need to re pressurise. It looks like there are two 3mm grub screws top and bottom that hold it in place? These are solid and I've tried...