Master Troubleshooting & Diagnostics Matrix
| Error Code / Indicator | Symptom / Meaning | Possible Cause | Step-by-Step DIY Fix | Suggested Actions |
|---|---|---|---|---|
N/A | Heating's red LED lights up or flashes: Malfunction | — | Take a small brush and gently clean out the heater's rotary switch. | DIY Safe |
N/A | FrostControl safety/drain valve indicates a risk of sub-zero temperatures | The FrostControl valve has detected a risk of sub-zero (freezing) temperatures. | The valve automatically drains the boiler's contents via the drain outlet - no action needed unless you want to prevent the automatic drain, e.g. by keeping the installation area heated. | DIY Safe |