Control displays 'Low Gas Pressure' or similar; burner may light weakly or not at all, then lock out.

Safety first: Turn off power and gas if you smell gas or suspect a leak. Ventilate the area and do not use open flames or switches.

• Check manual gas valves: Ensure all inline gas shutoff valves to the water heater are fully open (handle parallel to the pipe).
• Observe other gas appliances: If stoves or other heaters also show weak flames or outages, contact your gas utility; the supply may be low.
• Inspect gas piping: Look for obvious damage, corrosion, or recent changes to the gas line. Do not attempt to modify gas piping yourself.
• Do not adjust internal regulators: The gas valve regulator and manifold pressure must be set with a manometer by a qualified technician. Incorrect adjustment can be dangerous.
• Schedule professional service: Persistent low gas pressure faults require a licensed gas technician to measure inlet and manifold pressures and correct piping or regulator issues.