Finally got through to the “people” at whirlpool uk after 15 mins waiting only to find the “service” they offer is about as good as the bearings on indesit machines.
After endless trying managed to get access to Scc service where I found the led error sequence codes and display fault codes. Turns out the fault is the same as F23- pressure switch failure.
Pressure switch tests ok. Put replacement switch on, ran test programme-same fault.