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It's a Combi, Glow worm 30 cxi - the gas fitter NOTICED last night that the seal had gone on the main boiler area, upper left corner right next to where the thermostat is, so it was blowing very hot air directly onto the thermostat. and it was that heat that was making the system overheat shut...

Hi, I've had the F5 problem now for 8 days. Here's what's happened up to now: 1. New thermostat - not fixed 2. New Heat exchanger - not fixed 3. New PRV valve - not fixed Still showing f5 after resetting each time. Any thoughts or ideas??? Philip26

Hi, I've had the F5 problem now for 8 days. Here's what's happened up to now: 1. New thermostat - not fixed 2. New Heat exchanger - not fixed 3. New PRV valve - not fixed Any thoughts or ideas??? Philip26