Water heater emits a burning smell or plastic smell during operation.

Safety: If you see smoke or strong burning smell, immediately turn off power and gas and ventilate the area.

Steps:

• Initial use: A mild smell during first few hours of operation can be normal as oils burn off. If persistent, investigate.
• Inspect wiring: With power off, check for discolored or melted insulation near the PCB, fan, and gas valve.
• Clean dust: Vacuum dust from the burner area and heat exchanger to prevent burning odors.
• Ensure ventilation: Make sure the heater has adequate clearance and that vents are not blocked.

Professional help: Any signs of melted wiring or components require immediate professional service.