C6 checks
| Step | Check | If yes | If no / next |
|---|---|---|---|
| 1 | Fan cable connector correctly fitted on the fan? | Go to step 2. | Power off, reconnect, power on. If C6 remains, go to step 2. |
| 2 | Supply voltage within 230 V AC ±10% with other appliances on? | Go to step 3. | Switch off other loads, then go to step 3. |
| 3 | Fan lead continuity on each core? | Go to step 4. | Replace the fan cable. |
| 4 | Fan defective? | Replace the fan. If C6 remains, go to step 5. | Go to step 5. |
| 5 | PCB damaged | Note service settings, replace the PCB, restore settings. |
Gas work stays with a Gas Safe registered engineer. These steps are guidance from the manufacturer sequence, not a substitute for the handbook.