Hi folks,
Got a ListerPetter LPW4 fitted in a Norfolk Broads boat. Ran her up river yesterday and the hot water was cold. I've had a check of the system today and its all a bit strange. Referring to the attached diagram I pulled off pipe 1 with the engine running and a tiny trickle of water came out (Flow to the heater). Same for pipe 2 (Return from the heater). The engine isn't over heating, runs fine and when warmed up you can feel heat in the places I've marked as hot.
Any ideas why the water isn't moving around the heater ?
Thanks
Stu