Thetford C500 Series Cassette Toilet
Official technical documentation and workshop diagnostics for C500 Series.
Technical Specifications
Master Troubleshooting & Diagnostics Matrix
| Error Code / Indicator | Symptom / Meaning | Step-by-Step DIY Fix | Suggested Actions |
|---|---|---|---|
N/A | Waste-holding tank is difficult to remove Possible Cause: Waste-holding tank is too full | Empty the waste-holding tank | DIY Safe |
N/A | Waste-holding tank is difficult to insert Possible Cause: Mechanism is blocked or out of position | Ensure the mechanism is in the correct position and that slide is closed | DIY Safe |
N/A | Waste-holding tank leaks Possible Cause: Seal is dry or damaged | Lubricate the seal with approved lubricant or replace it | DIY Safe |
N/A | Flush does not work Possible Cause: Fuse is blown or power supply interrupted | Check the power supply and fuse. If the issue remains unresolved, contact an authorised service agent | DIY Check / Tech Fallback |
Frequently Asked Questions
Q: How to use the Thetford cassette toilet?
A Thetford cassette toilet is a lightweight and compact toilet designed for use in caravans and motorhomes. The waste is stored in a removable cassette tank, which can be easily emptied into a designated waste disposal point . Watch the video for full instructions
Q: Is it possible to replace my cassette toilet?
Yes. In most situations it is possible to replace the toilet. Contact your dealer or Thetford Service Centre for the possibilities.
Q: How do Thetford toilet additives compare to regular household cleaning products used at home when looking at their environmental impact?
A mobile toilet in your motorhome is not like a regular toilet at home. A mobile toilet additive has functionalities that are not required in your toilet at home. Our products are technologically advanced, applying the latest developments in tailor-made ingredients for mobile toilet applications, and are specifically intended for effective treatment of toilet waste in a small, confined space. We believe in offering the best performing products for mobile and portable toilets. For that reason, we continuously develop our products to improve their overall performance, whilst respecting the environment. The ingredients we use in our products comply with the biodegradability requirements for detergents in the EU, and we are constantly looking for opportunities to improve product performance at all levels. Household cleaning products are not designed to meet the requirements of a mobile toilet. Using them for a purpose for which they were not intended or treating wastewater from a mobile toilet with unsuitable products may negatively impact the environment or consumer health. So, never use a cleaning product for a purpose for which it was not designed. In conclusion, compared to regular household cleaning products, Thetford toilet additives are a more environmentally friendly option for the treatment of waste and prevention of odour and other problems in a mobile toilet system
Q: What is the best maintenance for my toilet?
Empty the waste-holding tank (toilet waste tank) when it is full or starts to smell (4 to 5 days for Thetford Blue products, 3 to 4 days for Thetford Green products), use Thetford Aqua Soft quick dissolving toilet paper to prevent clogging. Regularly clean the outside of the toilet with Thetford Bathroom Cleaner and clean the toilet bowl with Thetford Toilet Bowl Cleaner when necessary. Finally, clean the waste-holding tank and grey water tank (tank that collects waste water from sink and shower) with Duo Tank Cleaner Concentrated 2-3 times a year to keep all moving parts inside the tank at peak operational level and to prevent odour formation during winter storage.
Q: How often do I have to replace the lip seal?
Depending on user behaviour, we recommend replacement after 4-6 years.
Q: How to keep your toilet clean
Thetford offers a pleasantly-scented toilet fluid for the flush-water tank and a variety of waste-holding tank products. Aqua Rinse Concentrated keeps the flush water fresh, ensures a smooth flush and leaves a protective layer. All products for the waste-holding tank suppress unpleasant odours, stimulate the breakdown of waste, reduce the formation of gas, protect moving parts and help keep your waste-holding tank fresh and clean.
Q: I always clean my tank(s) with domestic cleaners. It gets clean as well. Why should I use Duo Tank Cleaner Concentrated?
First of all, in our tanks we talk about specific kind of dirt, not directly comparable with the home situation. And, it’s not only about curing, but also about caring. Duo Tank Cleaner Concentrated cleans and cares, without damaging the material of or components in your tanks.