Truma Trumatic C 4002 / C 6002
The Trumatic C 4002 and C 6002 are hot-air liquid-gas combination heating systems with an integrated 12-litre hot water boiler. They provide thermostatically controlled room heating and water heating simultaneously or independently, with fan-assisted operation for use while driving.
View official manual on manufacturer's site ↗Technical Specifications
Operating Voltage12V DC / 230V AC
Power ConsumptionHeater + water heater: C 4002: 0.2 – 5.6 A (average power consumption 1.3 A), C 6002: 0.2 – 5.6 A (average power consumption 1.4 A); Heating up of water heater: 0.4 A; Stand-by: 0.001 A; Electrical safety/drain valve: 0.035 A
Gas Or PressureLiquid gas (propane/butane), 30 mbar
Fuse RatingsDevice fuse: 6.3 AT (slow), Control panel fuse (F3): 1.6 AT (slow)
Master Troubleshooting & Diagnostics Matrix
| Error Code / Indicator | Symptom / Meaning | Possible Cause | Step-by-Step DIY Fix | Suggested Actions |
|---|---|---|---|---|
N/A | Switching on (winter or summer operation) lights no control lamp. | Could be a faulty appliance or vehicle fuse, an open window above the cowl (window switch), or low battery voltage. | Charge the 12V battery, check every electrical plug connection and fuse, and close the window. | DIY Safe |
N/A | Switched on from the ZUC timer, the green indicator lamp lights but the heater won't run. | A window above the cowl is open (window switch). | Close the window. | DIY Safe |
N/A | The red monitor lamp flashes once the heating system is switched on. | The battery voltage has dropped below 10.5V. | Charge the battery. | DIY Safe |
N/A | Around half a minute after the heating is turned on, the red monitor lamp comes on and doesn't go out. | The gas cylinder or its quick-closure valve is shut, or the air feed is interrupted. | Check the gas feed and check the cowl isn't covered - on a boat, make sure the deck cowl is open. | DIY Safe |
N/A | After running for a time, the heating goes into Fault mode. | Could be blocked hot-air outlets, an iced-up gas regulator, or gas with too high a butane content. | Check each outlet aperture individually, fit a de-icing controller (EisEx), and switch to propane - butane doesn't heat well, especially below 10°C. | DIY Safe |
N/A | Switching on (230V electrical operation) lights no control lamp. | No supply voltage. | Check the 230V supply voltage and its fuses. | DIY Safe |
N/A | The electrical safety/drain valve opens whenever the heating is turned off. | The outside temperature is below 4°C, or there's no 12V supply reaching the drain valve. | Switch the heating on - below roughly 4°C the drain valve opens automatically. Check the 12V supply voltage and fuses. | DIY Safe |
N/A | The electrical safety/drain valve won't close any more, or is dripping water. | Could be the outside temperature dropping below 8°C, no 12V supply at the drain valve, or excessive water pressure. | Switch the heating on - without it running, the drain valve won't close again until temperatures climb above 8°C. Check the 12V supply and fuses, and check the pump pressure stays under 2.8 bar, fitting a pressure reducer if it's on mains water. Contact an authorised service agent if this doesn't resolve it. | DIY Check / Tech Fallback |
Frequently Asked Questions
Q: Can the heating be operated without water in the boiler?
Yes - it's fine to run it with or without water content, whatever the mode.
Q: Why does the electrical safety/drain valve open by itself?
At temperatures below 4°C at the valve, or when the system loses 12V power, the safety valve opens automatically to drain the boiler and prevent frost damage.
Q: How do I fill the water boiler?
Close the safety/drain valve by lifting the control knob to position 'm', turn on the water pump power, and open the hot water taps until water flows continuously without air.
Q: Can I use the hot water for drinking?
No, the water in the boiler is not drinking water.