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Snap!

Just had the same thing happen. Popped the Thetford to local dealer who fitted a new valve in 15mins as the "seal" had gone. Not used it yet but seems ok now. Not sure if it could have been fixed by myself? Everything I touch normally goes wrong!!

See  Here  for a new vent valve.

atb

Wizard

I had this same problem.  It turned out to be very simple to deal with.  At some point when the cassette was very full, some substance I won't name had come up the vent hole and dried, so when the spring loaded vent tried to close it couldn't.

I got a small screwdriver and cleaned all the bits out, a few aquirts of WD40, and worked it up and down a few times by hand.

5 minutes, no problem.  Bet yours is the same.  Do try it before you spend any money.

Jim

Hi,

DO NOT use WD40 on anything plastic, it swells and jams, there are other sprays available but that one is meant for metal to metal. I found out the hard way by spraying the bushes on my Saab headlamp wipers, they seized.

Regards,

Chris.

Have had same problem and it is an easy fix.

For the benefit of others, the valve has a bayonet fitting - no harder than changing a light bulb.