Your Truma system heats the van's air and your hot water. This guide is for the CP Classic panel — the one you operate with a turn knob, where faults show as red or yellow blinks you count — on a gas heater.
Good to know before you start
- Your heater runs off the gas bottle in the gas locker — the same gas that feeds your hob.
- Air heating takes up to ~80 minutes to reach full temperature; hot water around 20. Give it time before deciding it's faulty.
- On the panel: green = on, yellow = warming up or a warning, red = fault.
- A quick reset clears many faults: switch the panel fully off, wait 5 seconds, and switch it on again.
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1. Outer control knob for heating mode 2. Inner control knob for temperature (1 – 5) 3. Yellow LED lit, “Boiler heat-up phase” Yellow LED flashing “Warning” Red LED lit, red LED flashing “Fault” 4. Green LED lit, “On” 5. Hot water mode - temperature 60 °C 6. Hot water mode - temperature 40 °C 7. Rotary switch “Off” 8. Air heating mode 9. Air heating and hot water mode |
Try these steps first — they fix most cases
Turn the temperature up.
Green light on but no heat almost always means the dial is set below the current room temperature. Turn it toward 5 and wait a few minutes.Close every window — firmly.
A single window even slightly open (including the small one by the table) trips a safety sensor that shuts the heater off. Walk around and give each one a firm push.Charge the leisure battery.
No lights at all, or a yellow warning blink, is most often a low battery — this is a very common cause. Plug into shore power at the driver-side socket, or run the engine for about 30 minutes, then switch the heater on again. → Charging your leisure batteryCheck the gas.
Yellow ×9 (about 30 seconds after you switch on) means no gas is reaching the heater. Quickest test: try lighting the kitchen hob.
- Hob lights → gas supply is fine, so it's the heater itself. Reset it (off, 5 seconds, on); if it still won't fire, contact us.
- Hob won't light → check the bottle isn't empty (lift it — an empty one feels noticeably light), make sure the cylinder valve is fully open, and press the black safety button on the gas hose.
- Cold weather, but the bottle still has gas? A butane bottle can read as "no gas" once it gets cold, because butane stops vaporizing → Fixing the ×9 gas error
What the fault lights mean
- Green flashing after you switch off — normal. It's a short cool-down run and stops on its own within about 5 minutes.
- Yellow ×1 or ×2 — battery voltage low (or, rarely, too high). Do step 3.
- Yellow ×3 — a window is open or ajar. Do step 2. → Closing the window sensor
- Yellow ×4 — airflow is blocked, or (if you're only running hot water) the boiler is empty. Check nothing is covering the warm-air outlets or the intake grille, and top up the fresh-water tank. → Clearing airway obstructions
- Yellow ×9 — no gas reaching the heater. Do step 4.
- Yellow ×5, ×7, ×8, a steady or 1–8× red light, or green and red together — an internal fault we need to handle. Please don't try to open or repair anything. Contact us (below) and we'll arrange the fix.
Still no heat?
💬 WhatsApp — message us here
📞 Call us — available in your rental agreement
Want the full manufacturer detail? You'll find the Truma CP Classic operating manual (PDF) in the box below.