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Guys looking for a wee bit of advice, at a Swiftflow today took a Telegan and got 0.0124 after doing the following, cleaned heat exchanger, inspected burner for cracks, Burner pressures set up correctly, inner flue appears ok, fan running fine. Been working on these boilers for years and never...

These boilers have proven to be a complete shambles during this big freeze. Despite being lagged they are still freezing up and not operating. Ive fitted a ridiculous amount of parts to numerous boilers past 2weeks with no cut-off on them. Potterton Promax springs to mind (Gas Valve, Fan , PCB...