[Richard L]

I hoep it is a electrical or relay problem rather than the pump.

Link the "SYS" to energise the relay, at th esaker time, pull out the "FAV" link to stop it from overheating. Get to the bottom of the relay and bridge the two thick red wires. If the pump comes on, it will be a relay problem. Also check for rely clicking by pulling and re-inserting the relay from the socket.

It is also possible the small wires or connector are corroded, check them. They are not water proof.

If it is a relay problem, we need to find out why it failed, corroded bearing puts undue load on the relay contacts.