Thetford toilet fan won’t turn off! (1 Viewer)

Sep 23, 2015
85
62
West Midlands, UK
Funster No
38,760
MH
N+B Arto
Exp
Since 2010
Our Thetford toilet has a built in fan which comes on automatically when the flush button is pressed. Normally you can switch the fan off with a white button next to the flush button, but it’s stopped working. The only way to stop it is by switching off the main power to the whole van and then back on again. It’s under warranty but we’re away at the moment and wondered if it was a simple fix. Any ideas?
 

TheBig1

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Nov 27, 2011
17,667
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19,048
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A class
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many many years! since I was a kid
no easy fix, its the little control board
 
Feb 24, 2013
13,163
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Bolsover, Derbyshire
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24,833
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Hymer S800
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not long enough
Sounds like you have a simple fix (y)

Failing that don’t flush, just open flap and let gravity take over :)

Is it an after market fitting? Or SOG?
 
OP
OP
J
Sep 23, 2015
85
62
West Midlands, UK
Funster No
38,760
MH
N+B Arto
Exp
Since 2010
Sounds like you have a simple fix (y)

Yep, unless it’s dark and all the lights go off too!
:D
Failing that don’t flush, just open flap and let gravity take over :)

I normally do, depends of course if there is anything left behind to flush...:)

Is it an after market fitting? Or SOG?
It’s thetfords own, filter and fan built in.

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DP+JAY

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Mar 17, 2010
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Laika 5009
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since 2007, 25 years tuggin before that.
Should also go off on its own on a timer if you don't press the other button. I bypassed the circuit board on ours & took a feed from the micro switch on the flap so the fan starts as the flap opens & stops as it closes. It was a pain if we forgot to press the button before being seated.
DP
 

old-mo

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Oct 16, 2008
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It’s thetfords own, filter and fan built in.

Micro switch in the cassette cupboard may have moved a little ...

And not touching the cam properly...

Couple I have had the switch is only held on/in by some sort of double sided tape..
 
Oct 14, 2007
4,041
6,378
Rochester
Funster No
619
MH
Auto-Trail Mohawk
Exp
17 fun filled years
If you can get the control panel off the loo unplug the fan from the PCB
 
Oct 27, 2017
1,420
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Perth
Funster No
51,142
MH
Hymer A Class
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Since 2014
Our fan is under a Thetford filter, under the cassette. You could snip one of the connecting wires.

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Jul 29, 2013
9,093
18,959
Salisbury
Funster No
27,215
MH
Hymer B678DL A class
Exp
since 2011
Had a problem with ours when the dam thing kept flushing, I discovered that due to poor siting of the button right underneath the wash basin water was getting in behind the panel and there was a little green corrosion around some of the soldering on the circuit board so got a soft tooth brush and cleaned it off not had trouble since and as temporary fix stuck a strip of gaffa tape accross the top to stop water ingress,(y)(y)(y)
 

Lenny HB

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Oct 18, 2007
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On the coast in West Sussex
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658
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Hymer B678 DL
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Since 2008 & many years tugging
Our microswitch occasionally slips of the bracket. I remove the cassette and push the spring clip back up.

Micro switch in the cassette cupboard may have moved a little ...

And not touching the cam properly...

Couple I have had the switch is only held on/in by some sort of double sided tape..
That's only on a SOG. The Thetford is a timer triggered by the flush switch
 
Last edited:
Oct 27, 2017
1,420
3,197
Perth
Funster No
51,142
MH
Hymer A Class
Exp
Since 2014
You can disconnect the fan by pulling the white connect with a red & black wires off the PCB.

Is that the PCB where the switch is located, or the one behind a cover at the back of the cassette locker?
 

Lenny HB

LIFE MEMBER
Oct 18, 2007
54,148
152,973
On the coast in West Sussex
Funster No
658
MH
Hymer B678 DL
Exp
Since 2008 & many years tugging
Is that the PCB where the switch is located, or the one behind a cover at the back of the cassette locker?
It's behind the panel, I disconnect mine as I have a SOG and the fan was running but not doing anything.

PCB is behind this panel. I can reach mine from inside the cupboard.
IMG_20190317_143332.jpg


IMG_20190317_143435.jpg

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OP
OP
J
Sep 23, 2015
85
62
West Midlands, UK
Funster No
38,760
MH
N+B Arto
Exp
Since 2010
Thanks everyone, mine is the same as Lenny’s , so I’ll try to get behind the panel and disconnect the wire for now, until we can get it sorted under warranty.
 

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