Master Troubleshooting & Diagnostics Matrix
| Error Code / Indicator | Symptom / Meaning | Possible Cause | Step-by-Step DIY Fix | Suggested Actions |
|---|---|---|---|---|
N/A | Heating's red control light lights up: Malfunction | — | Check the Truma heating system's own operating manual to work out what's actually causing it. To clear the fault, switch the heater off and back on again. | DIY Safe |
N/A | Safety/drain valve temperature drops below 2°C | Sub-zero or low ambient temperature | The boiler's contents will drain off automatically via the safety/drain valve. | DIY Safe |