Bore pump not starting??

After my recent pump problems I installed a new beaut station controller a RainBird ESP and it initially worked fine, there were a couple of sprinklers to be raised so I turned it off again after about 10 minutes.
Now when it switches on I can see the active station and the run time on the screen but the Start relay located next to the station controller doesn't kick in, no loud 'Clunk'.
I'm a Licensed Plumber Gas Fitter so I'm aware of the dangers of 'Lots of energy little knowledge' so I'm not asking how to fix anything electrical.
But I'm trying to trouble shoot the problem because my electrician is away for the weekend so;
(1) Is the problem likely to be in the ABB Pump switch located next to the Station Controller?
(2) Is it likely to be a Relay inside the pump switch that I hear 'Clunk' in when the pump switches on?
(3) Assuming it's in the Pump switch Is it likely it is repairable

Any theories/advice would be appreciated

(1) Is the problem likely to be in the ABB Pump switch located next to the Station Controller?
(2) Is it likely to be a Relay inside the pump switch that I hear 'Clunk' in when the pump switches on?
(3) Assuming it's in the Pump switch Is it likely it is repairable

OK located the problem...when we changed the pump to a bigger unit(6.5A) the relay inside the ABB DOL contacter was only a 5.0A max so electrician changed it so all's good.