"Cassette Full" light always on.
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this happened to me, the float contains a magnet which when its floats up to the top must cause some electrical contact and hence the light come on. On mine the float arm would not go back down after emtpying and I had to physically push the float down each time. Yours might be doing the same?
After a while the float broke off anyway. I always used to empty the cassette every third day anyway so I don't get caught out with the light coming on in the middle of the night. Hope this helps
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Either the float is stuck in the up position OR the reed switch is stuck
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take the battery out to stop the light?
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The magnet activates a reed switch contained just in front of the float position in the housing.
You can test it by putting a magnet near the reed switch housing with the cassette out.
https://en.wikipedia.org/wiki/Reed_switch
If the light goes off when the cassette is out then the reed switch may be OK and the float may be stuck in the full position?
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Thanks for the replies. The situation so far is that the float seems to be moving freely. Removing the cassette and putting a magnet against the reed switch turns the light out. Could the switch be faulty? I removed the switch circuit bosrd recently as the terminals were furred up (this was when the flush ceased to work due to a furred fuse as it happens). I cleaned the terminals on the switch circuit and put it back.
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The same happened to us as we were setting off for a CL last year. A bit of a worry when you're relying on your own facilities for two weeks. The light was on when the holding tank was empty, but it worked OK, however, a quick swill around the tank with
some water solved the problem. Can only surmise that there must have been a bit of paper stuck on whatever sensor or bit of equipment in the tank causes the light to work. Could be something as simple as that.
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I don't think our light has worked since the day we got the caravan.
We just take a look while the flap is open, to see if it's full.
Take the battery out, would be my advice.
Write your comments here...I thought the power supply was from the leisure battery, has it got it's own battery? I have never seen our light work, may be that's why. Where is it and what is the type?
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a 9v one pp3, mines to the side of the cassette
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After various fiddling about the light is now out. I shall leave things alone now as the cassette gets emptied regularly and I doubt it will ever get near to full. Incidentally, out light is operated from the caravan system, there is no battery to be removed.
Thanks all for your input.0 -
Thanks for the replies. The situation so far is that the float seems to be moving freely. Removing the cassette and putting a magnet against the reed switch turns the light out. Could the switch be faulty? I removed the switch circuit bosrd recently
as the terminals were furred up (this was when the flush ceased to work due to a furred fuse as it happens). I cleaned the terminals on the switch circuit and put it back.Write your comments here...
Surely the reed switch should close when close to a magnet - that's how they work - A closed switch will switch on the light in a simple circuit. If a magnet switches your light "off" then there's something very wrong with the circuit board.
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I gave up on the "full light" about 2 years ago - my Thetford has been somewhat of a nightmare - but now I KNOW its not my fault that it used to overflow into the locker whatever I did - I am not bothered by a warning light not working. (The reason it dirtied
the locker was that the two halves of the cassette had become unsealed - as far as I know not my fault - but it happened! And those lockers are not made for such overflows! Thetford - however assures me that they are changing their lockers to make them more
"spill" friendly!)Bring back the old manual flush - say I - and do we really need a warning that its full? So much technology equals unnecessary room for malfunction - to me.
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