AEG Lavamat 84749 C1 error code

Hello folks from near Hungerford, Berks –

Have searched here and not found a solution to our problem:

AEG oko Lavamat 84749 Update, bought s/h last week. Had one year light domestic use before we bought it.

Gets to rinse part of cycle and (sometimes) stops with C1 error code showing and both pre-rinse and start/pause lights flashing continuously (ie: no pattern). On pressing start/pause button, machine resumes and completes cycle.

Seems as if the fault sometimes occurs when water flow is momentarily reduced (by flushing of loo, for example) coinciding with rinse. I have checked hose/inlet filters are clean and proved water supply (a 20ft head from cold water tank in loft). The mains pressure reducer in the inlet is removed.

And now…wife has just called me to kitchen to hear machine with 14 mins of cycle to go making a buzzing/vibrating noise during final rinse. Sounds like a solenoid?

Any suggestions gratefully received.

Thanks

KevinF.