Device or vehicle fuse is defective, or no supply voltage.

Check battery voltage (12 V) or 230V supply and fuses, and check all electrical plug connections.

Window above the cowl is open (window switch triggered).

Close the window above the cowl.

Battery voltage too low (< 10.5 V), gas supply closed, or air feed interrupted.

Charge battery, check gas feed, check cowl for obstructions, or open deck cowl on boats.

Hot-air outlets blocked, gas pressure regulator iced up, or butane content too high.

Check individual outlet apertures, use Eis-Ex de-icing system, or switch to propane.

Water pressure is too high.

Check pump pressure (max 2.8 bar) and ensure a pressure reducer is used for central water supplies.

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Truma • Space Heater and Water Heater

Truma Trumatic C 3402 / C 6002

Q: Battery voltage too low (< 10.5 V), gas supply closed, or air feed interrupted.

Charge battery, check gas feed, check cowl for obstructions, or open deck cowl on boats.

Q: Hot-air outlets blocked, gas pressure regulator iced up, or butane content too high.

Check individual outlet apertures, use Eis-Ex de-icing system, or switch to propane.

Q: Water pressure is too high.

Check pump pressure (max 2.8 bar) and ensure a pressure reducer is used for central water supplies.

The Trumatic C is a combined liquid-gas hot-air space heating system with an integrated 12-litre hot water boiler. It features fan-supported burner operation for use while driving and supports both winter (heating + water) and summer (water only) operation modes.

Technical Specifications

Gas Pressure Mbar30 or 50 mbar

Power Consumption 12vC 3402: 0.2 - 2.4 A; C 6002: 0.2 - 5.6 A (Stand-by: 0.001 A)

Power Consumption 230v450W / 2A (Trumatic C EL electric heating option)

Water Capacity Litres12 litres

Weight Kg17.6 kg

Master Troubleshooting & Diagnostics Matrix

Error Code / Indicator	Symptom / Meaning	Step-by-Step DIY Fix	Suggested Actions
`Operational Fault`	Device or vehicle fuse is defective, or no supply voltage.	Check battery voltage (12 V) or 230V supply and fuses, and check all electrical plug connections.	DIY Safe
`Operational Fault`	Window above the cowl is open (window switch triggered).	Close the window above the cowl.	DIY Safe
`Operational Fault`	Battery voltage too low (< 10.5 V), gas supply closed, or air feed interrupted.	Charge battery, check gas feed, check cowl for obstructions, or open deck cowl on boats.	DIY Safe
`Operational Fault`	Hot-air outlets blocked, gas pressure regulator iced up, or butane content too high.	Check individual outlet apertures, use Eis-Ex de-icing system, or switch to propane.	DIY Safe
`Operational Fault`	Water pressure is too high.	Check pump pressure (max 2.8 bar) and ensure a pressure reducer is used for central water supplies.	DIY Safe

Frequently Asked Questions

Q: Can I run the heating without any water in the boiler?

Yes, heating operation is basically possible without restriction with or without water content.

Q: How do I empty the boiler to prevent frost damage?

Interrupt the power for the water pump, open all hot water taps in the kitchen and bathroom, and open the electrical safety/drain valve by pushing/pressing the control knob into position 'n'.

Q: What should I do if the electrical safety/drain valve opens automatically?

At temperatures below 4°C, the valve opens automatically when the appliance is off. To close it again, switch the heating on (summer or winter mode) and close the valve by lifting the control knob to position 'm' (note: requires temperatures above 8°C if the heater is not running).