How to Fix / Troubleshooting

Safety first: Turn off power and gas before inspecting the burner area.

Inspect electrode: Remove the ionization electrode and check for carbon tracking, cracks, or metal contact with the burner frame. Clean and reposition according to Roca specifications.
Dry moisture: If there is condensation or water around the electrode or wiring, dry thoroughly and identify the source of moisture (leaking seals, flue issues).
Check wiring insulation: Look for damaged insulation that could cause the ionization lead to short to ground.
Verify grounding: Ensure the furnace chassis is properly grounded and that no external voltage is being induced on the burner assembly.

Warning: Persistent false flame errors may indicate a defective control board, which should be replaced by a qualified technician.

Furnace shows flame detection error even when burner is off, or indicates false flame

Possible Causes