Boiler emits unusual odors (burning, metallic, or exhaust smell) during operation

Safety first: If you smell exhaust or suspect carbon monoxide, turn off the boiler immediately, ventilate the area, and leave the building. Call emergency services and a qualified technician.

• Inspect vent connections: Check that all vent and intake pipes are securely connected and not damaged.
• Look for soot: Through the sight glass, look for heavy soot buildup on the burner or heat exchanger. This indicates improper combustion and requires professional cleaning and adjustment.
• Check for burning plastic or wiring: With power off, inspect internal wiring and components for signs of melting or overheating. Replace any damaged parts.
• Install/verify CO detector: Ensure a working carbon monoxide detector is installed near sleeping areas.