Truma water pump not working even after replaced

Hi, we have an Aqual Roll barrel with the Truma pump that sits at the bottom of the barrel (In Coachman Amara 576). In between trips the pump has stopped working:

1. There is no buzzing sound from the pump
2. We've replaced the pump unit pipe with a new one
3. I've cleaned the copper connector nodes
4. The red light is on on the pump switch on the dashboard
5. The 'pump' fuse has been changed and wasn't broken
6. We've tried both taps

I'm now at a loss for anything else to try, and we are on holiday in Pembrokeshire and of course at this time of year there is no availabilty for engineers. I am going to buy an electrical tester to test if there is power to the outside, but I suspect this must be an electrical issue. My wife did put a suitcase ontop of all the pipes at the beginning of the trip so could have bashed something in the water heater area.

Any advice or things to try would be so appreciated. 🙏

H Risley