Master Troubleshooting & Diagnostics Matrix
| Error Code / Indicator | Symptom / Meaning | Possible Cause | Step-by-Step DIY Fix | Suggested Actions |
|---|---|---|---|---|
N/A | Heating control light doesn't come on at all during ignition | — | The batteries in the heater's automatic ignitor have run down - fit a new, leak-proof, temperature-resistant (up to +70°C) mignon battery of the same type. | DIY Safe |
Recommended partAffiliate linksView partHideHobby and Truma specify a temperature-resistant (+70°C), leakproof AA (Mignon) battery for the ignitor. We couldn't find a widely sold AA rated to +70°C - this lithium AA is the highest-rated common option (+60°C, versus about +50-55°C for standard alkaline). AA lithium (rated to +60°C)Energizer Ultimate Lithium AA Batteries (4 Pack)~£6.99 for 44.6★ (26,000+ ratings), sold by Amazon - lithium AA, rated -40°C to +60°C View on Amazon → | ||||