Hi Possum

Thanks for your reply.

There is no float in the cassette, it's just a plastic box with inlet, outlet and pressure relief valve.

As far as I can see level sensing is done electronically, remotely and externally.

Yes, thank you both now I see the light! :)

I suspect the external sensor is a Hall Effect and the internal float contains a magnet which, perhaps, has wandered off to have a life of its own - I have no desire to pursue it :)

Oh well, I guess we'll have to go low tech and simple look into the tank to assess how full it is.

There is a fuse behind where the cassette sits, 3 or 5 amp from memory. Also there is a square relay mounted in same vicinity. Its a common relay. I have changed both over 11yrs. Easy job. If that fails you can just replace your cassette as the problem may be in the float switch. You can repair them but for $180 (on special) thats what I do. Its all dependent on time, mess and dollars.

Mike,

Been there, done that! Hope you didn't get an overflow like I did! (Luckily, I keep a packet of disposable gloves and disinfectant in the van.)

Like you I found the float arm missing, replaced that with considerable difficulty. Still didn't work. Then found that the light itself had burned out, replaced that with a nice large red one from Jaycar. Still didn't work. Checked the fuse - the previous owner had put a 15-Amp one in, obviously a bit of an overkill as probably would only require something like a 5-Amp at the most, but it indicated that the previous owner also had a problem. Fuse OK but still doesn't work.

Checked the magnetic relay switch with a hand held magnet - the light worked. But the newly installed freely moving float arm inside still didn't activate the light. Another overflow.

Then like Bas & Eve, I also bought a new cassette after I damaged the old one trying to open the top up so that I could access the inside better.

Now as we only use the cassette at night and use the CP's facilities during the day I simply empty the cassette every two days without fail.

While typing this I pondered - I wonder if the magnetic relay switch could have been knocked out of alignment and thus not being close enough to the cassette side for the magnet to exert sufficient pull on the reed?

I'll check that before our next trip. In the meantime, has anyone else anything that I could try?

Murray

Try filling with a few ice cubes, 3/4 full of water & detergent . Go for a drive around the block ? Fibre they say keeps things flowing !!

BAZZA44 wrote:

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Why bother with the float, I just look through the opening after flushing to see how full it is. Never had a spill.

Barry

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 Me too

Many moons ago my 'cassette full' light stopped working.  The reason was that the 'pendulum' with the magnet had jumped over the wrong side of a locating ridge & when it was forced up it was nowhere near the relay.   Maybe I shook it too vigorously when cleaning.

I no longer rely on the light, just keeping an eye on the level & emptying it every 3rd day or when moving to a new location.