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my potterton puma 80, the hot water is very hot can run hot water 4 maybe 5 mins the boiler lockout light comes on......any ideas please

can anyone help... i've got a potterton puma 80,when i turn on the hot water the red led light comes on the modulating board.get hot water for about 3 mins then it locksout..fine on central heating any ideas will be very helpful......