Hi there my boiler goes to the F1 mode at 8 times a day. We recently had a British gas engineer who fitted a new heat exchanger, new inline dirt collecting filter, new gas valve, new electrodes and thermostat sensor. Within a hour of him leaving the boiler went on to the F1 mode and as continued to do so since. Do you have any suggestions that may help me solve the problem. Thanks, John
SOURCE: sime 80E friendly format boiler
Sounds like a control board or wiring to the unit has shorted out.
SOURCE: i have a protherm 80e combi it goes through start
1/overheat stat2/ fan 3/ diaphrapm valve 4/micro switch check small rubber or nylon hose at fan for pinhole best of luck
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