Boiler displays error 30 and will not operate; may be accompanied by a smell of combustion gases or signs of overheating inside the casing.

Safety first: Turn off power and gas immediately. If you smell flue gases or see soot around the boiler, ventilate the area and do not operate the unit until inspected by a professional.

• Visual inspection: Remove the front cover and inspect the flame rod and wiring. Look for cracked ceramic insulators, burnt wiring, or moisture on connectors.
• Dry moisture: If condensation or water ingress is visible, gently dry the area with a clean cloth and allow time for complete drying before re-energizing.
• Check wiring harness: Ensure the flame rod lead is not pinched or rubbing against metal parts, which can cause shorts.
• Do not bend or file the rod: Flame rods are precisely positioned; do not attempt to reshape or sand them.
• Professional service: Error 30 typically requires a qualified technician to test the flame circuit and replace the flame rod or control board as needed.