Thanks anyway dave now not required. Fault is overfilling intermittently halfway up the door. No blocked pressure vessel or worn out pressure hose. strangely enough the overfill protection is kicking the drain pump in as the drum rotates(single pressure switch only). When i drained and refilled the machine i heard the pressure switch click as the machine stopped filling. all plugs on module secure and could not reproduce the fault after i told the customer on the phone to switch off and let me see it. Candy were out in 1st week for this rattling pump noise. they replaced pump. no different. any ideas? module or intermittent pressure switch?
No connection to i/lock. Overfill protection works though so pressure must be staying in hose unless fill rate exceeds airleak rate. Replaced hose anyway (possible kink where it clips onto drum after leaving pressure vessel)and waiting to hear from customer.