Does your cartridge have two seals that look like two eyes and a nose.
I had the same problem on a CI motorhome and found that one of these seals had a break in it. This caused it to drip, lose pressure and cause the 12volt pump to switch in.
I sent pictures of the cartridge to several motorhome retailers and Davan Westonsupermare (CI agents) had a complete cartridge in stock for about £13.
I have tried everywhere for the seals but no sucess.
David Hutchings
July 2009