Bailey Ranger 510/4 1998 hot water tank not pressurising

by Mickey
(Whiltshire)

When I connect pump and turn on cold water works fine but no hot water coming out of taps. Pump keeps going on and off every minute.

Cannot find any leaks. If left on with taps off for a few minutes the pump still goes on and off and when you turn on the hot tap you get a small dribble of water then nothing.

Can anyone help.