Thetford Cassette Toilet C400 Series User Manual

1. Introduction

This user manual provides essential information for the safe and efficient use and maintenance of your Thetford toilet. Please read all safety instructions and information carefully before proceeding. Retain this manual for future reference. For the latest version, visit www.thetford.com.

2. Symbols

Key to symbols:

• Warning: Risk of serious injury and/or damage. ⚠️
• Caution: Risk of injury and/or damage. ❗
• Attention: Important information. ?
• Note: Information. ℹ️

3. Main components

Refer to the fold-out cover for a visual reference of the main components:

1. Cosmetic cover
2. Handle to open/close blade
3. Waste-holding tank level indication (only 1 LED for C402-C)
4. Flush button
5. Flush-water tank level indication (only for C402-X)
6. Cover
7. Seat
8. Bowl
9. Nozzle
10. Vent button
11. Handle 1
12. Blade opener
13. Wheel
14. Waste-holding tank mechanism
15. Automatic vent
16. Pour out spout
17. Tank lock clip
18. Pull handle
19. Measuring cup
20. Handle 2
21. Lip seal
22. Sliding cover
23. Drain tube (only for C402-C and C402-X)
24. Service door
25. Waterfill funnel (only for C402 models)

Note: The C403-L uses the vehicle's central water tank for flushing. The C402-C and C402-X have an integrated flush-water tank. A cassette toilet is not connected to a central sewage system; it has an integrated sewage system that needs to be emptied when full.

4. Before use

Ensure all packaging materials have been removed.

Prepare the waste-holding tank:

• Remove the waste-holding tank through the service door (01).
• Place the waste-holding tank upright and turn the pour out spout upwards.
• Remove the cap from the pour out spout (02).
• Check the correct dosage of Thetford waste-holding tank additive on the package.
• Add the stated dosage to the waste-holding tank (03).
• Add approximately 3L of water to the waste-holding tank to ensure the bottom is covered (03).
• Screw the cap back onto the pour out spout.
• Slide the waste-holding tank back into its original position via the service door.

Caution: Never add toilet additives directly via the valve blade or toilet bowl, as this can damage the lip seal of the waste-holding tank. Only fill the waste-holding tank via the pour out spout.

Caution: If the waste-holding tank cannot be easily reinserted, do not use force. If a blockage occurs, check if the blade handle is in the closed position. To depressurize the waste-holding tank, press the vent button before placing the tank back in its position.

Prepare the flush-water tank (only for C402-C and C402-X):

• Turn the waterfill funnel (04).
• Remove the cap of the waterfill funnel (05).
• Check the correct dosage of Thetford flush-water tank additive on the package.
• Add the stated dosage to the flush-water tank through the waterfill funnel (06).
• Fill the flush-water tank with clean water using a jerry can or hose (06).

Note: Not using Thetford products for toilet care may cause damage.

Check after storage:

• After storage, check the water installation for damage before refilling.
• After refilling, check for flush functionality and ensure there are no leakages.

5. Use of the toilet

Attention: The toilet can withstand a maximum load of 120kg. Do not overload the toilet.

Opening the blade:

• Open the blade by turning the control knob counter-clockwise (07).
• Close the blade completely by turning the control knob clockwise until a click is heard (07). Always close the blade completely after use.

Note: The toilet can be used with the blade open or closed.

Flushing the toilet:

• Ensure the blade is open.
• Press and hold the flush button for several seconds to flush the toilet (08).

Note: Ordinary toilet paper can cause clogging. Thetford Aqua Soft toilet paper is recommended as it is super-soft, dissolves quickly, prevents clogging, and makes emptying the waste-holding tank easier.

Caution: To prevent water damage to your caravan or motor home, do not travel with water in the toilet bowl. Do not leave water in the toilet bowl when the toilet is not in use, as this does not help reduce unpleasant smells and can lead to flooding.

6. Emptying the waste-holding tank

The waste-holding tank has a capacity of 19.3L. Empty it when the red light on the control knob illuminates. The tank can be used for two further uses before emptying. Empty at an authorized waste dump.

• Remove the waste-holding tank (01).
• Pull the pull handle up until fully extended (09).
• Transport the tank to an authorized waste disposal point.
• Place the waste-holding tank upright and turn the pour out spout upwards.
• Remove the cap from the pour out spout (02).
• Press and hold the vent button with your thumb while the pour out spout points downwards to empty the tank (10).
• Add approximately 5L of water to the waste-holding tank and replace the cap (11).
• Gently shake the tank to clean it (12).
• Empty the waste-holding tank again (10).
• Push down the pull handle until it clicks into place.

If you intend to continue using the toilet, prepare the waste-holding tank as described in the 'Before use' section.

Slide the waste-holding tank back into the toilet and close the service door.

Caution: To prevent water damage, do not travel with a waste-holding tank more than 3/4 full, as this may cause leakage through the venting system.

Attention: Do not allow the waste-holding tank to become too full.

Note: Thetford green toilet additives are safe for septic tanks and small biological systems on camping sites.

7. Emptying the flush-water tank (C402-C and C402-X)

The flush-water tank has a capacity of 15L. The water level can be checked via the drain tube or, for the C402-X, the level indicator on the control knob. Only empty the flush-water tank completely if the toilet will not be used for an extended period.

• Place a sufficiently large bowl under the drain tube.
• Pull out the drain tube (13).
• Catch the water in the bowl (14).
• Close the drain tube and replace it (15).
• Empty the bowl at an authorized waste disposal point.

Caution: To prevent water damage, do not travel with a flush-water tank that is too full. Thetford advises travelling with an empty flush-water tank, or at least not filled more than half-full.

8. Maintenance and cleaning

Thetford recommends regular cleaning to prevent limescale and ensure optimal hygiene.

• Clean the inside of the bowl with Thetford Toilet Bowl Cleaner and a soft brush.
• Clean the outside of the bowl with Thetford Bathroom Cleaner.
• Remove the seat and cover for thorough cleaning.

Caution: Never use household cleaners, as they can cause permanent damage to seals and other toilet components. For example, liquid bleach can lead to discoloration.

Thetford recommends regular maintenance to prolong the toilet's lifespan.

• Use Thetford Cassette Tank Cleaner 2-3 times a year on the waste-holding tank to remove stubborn limescale.
• Use Thetford Seal Lubricant to keep seals soft and pliable. It is specially developed for mobile toilets and is safe to use.

Caution: Never use Vaseline or vegetable oil to lubricate seals, as this may cause leakage into the waste-holding tank.

Note: The blade seal is a wear part. Depending on usage and servicing, it may need replacement over time.

9. Winter use

The toilet can be used normally in cold weather if it is located in a heated area. If not, and there is a risk of frost, it is advised not to use the toilet. Ensure the toilet and the vehicle's water system are completely drained. Empty the waste-holding tank and the flush-water tank (if applicable), referring to 'Putting in storage'.

10. Troubleshooting

Note: If a problem cannot be solved, contact an authorized local Service Centre or Thetford Customer Service in your country.

11. Servicing

All servicing must be carried out by an approved competent person.

12. Putting in storage

• Empty the flush-water tank (model dependent) and the vehicle's water system.
• Push the flush button until no flush-water is visible.
• Empty the waste-holding tank.
• Thoroughly clean and dry the entire toilet.
• Open the blade and loosen the cap of the pour out spout to ventilate the waste-holding tank.

It is recommended to perform maintenance before putting the toilet into storage. Refer to 'Maintenance and cleaning'.

13. Questions

For questions about your product, parts, accessories, or authorized services:

• Visit www.thetford.com.
• If a problem cannot be solved, contact the authorized local Service Centre or Thetford Customer Service in your country.

14. Warranty

Refer to the warranty conditions on www.thetford-europe.com/service/warranty. For more information, contact Thetford Customer Service in your country.

Contact Information

For service, please contact your authorized local Service Centre, providing the model and serial number from the data badge, along with the date of purchase. The data badge is located on the base of the toilet.

Thetford Locations

European Headquarters

Thetford B.V.
Nijverheidsweg 29
P.O. Box 169
4870 AD Etten-Leur
The Netherlands
T: +31 76 504 22 00
F: +31 76 504 23 00
E: info@thetford.eu

United Kingdom

Thetford Ltd.
Unit 6
Brookfields Way
Manvers, Rotherham
S63 5DL, England
T: +44 844 997 1960
F: +44 844 997 1961
E: infogb@thetford.eu

Germany

Thetford GmbH
Schallbruch 14
D-42781 Haan
Deutschland
T: +49 2129 94250
F: +49 2129 942525
E: infod@thetford.eu

France

Thetford S.A.R.L.
Parc BUROPLUS / Bâtiment 6
18, Boulevard de la Paix
95800 CERGY
France
T: +33 1 30 37 58 23
F: +33 1 30 37 97 67
E: infof@thetford.eu

Italy

Thetford Italy c/o Tecma s.r.l.
Via Flaminia
Loc. Castel delle Formiche
05030 Otricoli (TR)
Italia
T: +39 0744 709071
F: +39 0744 719833
E: infoi@thetford.eu

Spain and Portugal

Mercè Grau Solà
Agente para España y Portugal
c/ Castellet, 36 bxs 2ª
08800 Vilanova i la Geltrú
Barcelona
España
T: +34 938 154 389
F: not available
E: infosp@thetford.eu

Scandinavia

Thetford B.V.
Representative Office Scandinavia
Hantverkaregatan 32D
521 61 Stenstorp
Sverige
T: +46 31 336 35 80
F: +46 31 44 85 70
E: infos@thetford.eu

Australia

Thetford Australia Pty. Ltd.
41 Lara Way
Campbellfield VIC 3061
Australia
T: +61 3 9358 0700
F: +61 3 9357 7060
E: infoau@thetford.eu
www.thetford.com.au

China

Thetford China
Rm. 1207, Coastal Building
(East Block)
Haide 3rd Road, Nanshan District
Shenzen, 518054
China
T: +86 755 8627 1393
F: +86 755 8627 1673
E: info@thetford.cn
www.thetford.cn

www.thetford.com