Vaillant Ecotec Pro 24 plus goes to F28 fault code after 4 hours.
Any one can help I have got Vailliant combo boiler, the boiler will stop working when not in use at night or left not used for 4 hours and once reset the boiler will run all day without stopping.
The boiler will only stop working when hot water is not used for over 4 hours any idea?
Thanks in advance.
Any one can help I have got Vailliant combo boiler, the boiler will stop working when not in use at night or left not used for 4 hours and once reset the boiler will run all day without stopping.
The boiler will only stop working when hot water is not used for over 4 hours any idea?
Thanks in advance.
)
Comment