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Hello The green light has just started flashing when turning on hot water tap then cuts out to red light. I reset by pressing the red light but it does it again after 20 seconds or so. Any ideas of what the problem may be. I have had the boiler 3 years with no issues. Thank you.

Hello can anyone help my Main Multipoint FF hot water heater has an issue, the green light flashes then cuts out and the red light goes on. It will reset then do this again every time. Can anyone advise or tell me what the problem could be? Thank you.