Thanks for that mike, it is a worcester bosch combi 24cdi heating and water can stay on for an hour then everything goes off and the red light flashes. it will come straight back on when reset, but then goes off again . it is worse when the heating is on when just using hot water it doesnt trip as often

SOURCE: Worcester combi boiler losing pressure & water through o/flow

having the same problem and its a new bolier. thanks , adriano.

SOURCE: worcester 24i combi when in shower hot water

This is lack of water flow through the diverter valve.

First have you got a good flow from any cold tap? If yes then see below

If I remember there is a pipe carrying cold mains crossing the lower front of the boiler with an in line filter usually clogged. Remove clean & replace
check also any filter in rising mains to boiler

another cause is the diverter valve itself - diaphram inside may be punctured/split

SOURCE: hi, my ideal combi boiler mini HE C24 has lights

could be your microswitch check overheat stat and fan are o.k. best of luck

SOURCE: flashing red light on Worcester 24i junior combi boiler

Pressure is ok? at 1 bar or above
I think on this one there should be a reset button [red] on the left hand top of the casing - or lower the control panel [ phillips screw on each side] and the button is on the left of the base plate. Press this and try the heating.or hot tap
P.S. if you're on a prepayment meter check you have gas.

Testimonial: "Thank you, very helpful advice. Still got the plumber coming to check everything over but the boiler is up and running for now. Thank you so much"

SOURCE: Bosch AQ125BNG Burner goes out even though the

Often, this is the result of a restriction of exhaust gases. This type of hot water heater must be adequately vented, (per installation specs). I found this out after taking a number of cold showers. :^( Two years later, and still counting, no more problems. :^)