Code f- 18 means filter blocked. Filter is clear, detergent solution pump is clear and moving freely, pipes are clear. What else can be making the f-18 code come up when everything has been checked and rechecked? Occasionally a wash will go through without stopping.

Jaycee, November 2014

Possibly pressure switch intermittently not deactivating when drained out . Trace small hose from pressure down to air collector chamber and check chamber is not blocked with sludge. Also blow down hose from pressure switch end to clear it.Cheers.

Kenjo, November 2014