Share this story Share on Facebook icon Share on Twitter icon Share on Pinterest icon Share on Google Plus icon Share on Linked In icon Share via Email icon

Cassette flush DIY


  Caravan Toilets: The Ultimate Guide

  DIY: caravanning projects to try yourself

Fixing the Flush!

A caravan DIY project by our very own caravan experts.

Got an issue with your toilet? Not flushing as you would expect it to? Before you rush off to get it fixed, take a look at this project and see if it’s something you can fix yourself!

Page Contents


Discovering the problem.

No flush water

Our first trip this season revealed that my checks had proved incomplete as there was no flush water coming into the cassette toilet and no sound of the pump running.

Fuse was blown

A quick call to the caravan dealer established that the bench cassette toilet fuse was an uncommon 3A purple blade fuse located inside the cassette compartment and could be changed once the cassette was removed. It’s fiddly to get to as it was mounted high up at the back end of the compartment under a small panel at arm’s length from the access door.

My multimeter showed that the fuse had failed, but why? It seemed sensible to check the pump before fitting a new fuse.

What caused the fuse to blow?

Pump had seized

It turned out that the pump had seized, which was causing an overlarge current flow to blow the fuse, thus protecting the pump motor windings. Access to the flush pump is also tricky and you need to reach it from the washroom.

Once repaired, it was refitted with a new fuse and the wiring and connectors carefully checked before running the pump briefly to confirm that no permanent damage had been done.

Same size fuze - always!

It is important always to remember to refit a replacement fuse of the same rating as this will continue to protect the wiring of the pump itself.

What caused the pump to seize?

Algae seized the pump

Returning the pump to its reservoir, I did notice that presumably because I just use fresh water for flushing, the interior of the flush tank was a bit slimy with algae.

I think that it was this that had caused the pump seizure once the tank had been drained for winter and dried out, gluing up the pump innards.

Step by step guide

Here is the complete fix in one simple 3-step guide.

  1. From the washroom side, gently lever off the white plastic flush lever then the oval plastic control panel beneath it. Put your hand in and find the pump water pipe and follow it down to the submersible pump which dangles in the flush water reservoir.
  2. Wiggle the pump back up through the access hole and use a small screwdriver to check the free rotation of the pump impeller, which is visible centrally at the bottom of the pump casing. Mine was solid but a few turns with the screwdriver completely freed it.
  3. The pump fuse is behind the now marked panel in the cassette compartment. A new 3A fuse was fitted and correct operation of the pump was checked before reinstalling it in the flush tank.

Now you’ve completed all the steps, you should have yourself a perfect flush!

Did you know?

We have created a fully searchable library of every issue of Caravan magazine since 2013.

Our archive partner provides the searchable database to help you find, download and read any and every issue instantly, on any device, on any topic, wherever you may be, including the latest editions!

Why not try searching for more great caravan articles now?

Finished Reading?

Back to:   Caravan Toilets: The Ultimate Guide

Expert Caravan advice to your door!

Caravan Magazine

Caravan magazine has been inspiring caravanners for more than 80 years! We have grown to become a leading authority on caravans, the caravan industry, caravan lifestyle, campsites and caravan travel destinations. We know what our readers want – and that's to make the most of their caravans and their holidays!

Want to know more about Caravan Magazine?

About Caravan Magazine  

Buying your first caravan?

Buy Your First Caravan Magazine

If you are buying your first caravan, then this special edition is for you. It has everything you need to guide you through choosing a layout, all the new models, what to look out for and how to get the best price. It also includes everything you need to know as a new caravan owner about maintenance, insurance, towing and so much more...

Find out more about 'Buying Your First Caravan' special edition:

Buying Your First Caravan  

Back to "Practical Advice" Category

05/08/2020 Share this story   Share on Facebook icon Share on Twitter icon Share on Pinterest icon Share on Google Plus icon Share on Linked In icon Share via Email icon

Recent Updates

Enjoy world cuisine no matter where you’re pitched up ...

10 top attractions in the Malverns

Extend and enhance your stay at the Western Motorhome & Campervan Show with these unmissable attractions ...

Caravan cookery Summer 2022 in association with Campingaz

Ditch the usual barbecue fare and try something more unusual ...

All you need to know about towbars & towballs

Flange, detachable, swan neck, retractable – towbar technology choice is bewildering. Don’t worry. We’ll ...

Other Articles

Get the grill on and gather the tribe for a meal together ...

Caravan cookery in June in association with Campingaz

Try a new dish this month with these exciting recipes ...

Smart caravans: the E-Trailer system

Even if you have an older caravan, the E-Trailer app, a new system with a range of useful functions, will ...

Caravan awnings - a buyers' guide

So you want to enhance your living space with an awning – great idea. Here we tell you everything you need to ...