Heater shows E19, often after long periods of inactivity or after maintenance.

Safety: If you smell gas, do not attempt to reset. Ventilate and call a professional.

• Reset procedure: Follow the Termet manual to perform a lockout reset (usually by pressing and holding the reset button or power cycling).
• Bleed air: After gas supply has been off, air may be in the line. Open a hot water tap and allow the heater to attempt ignition several times, with pauses between attempts, to purge air safely.
• Check gas supply: Ensure the gas valve is open and that other gas appliances function.
• Call technician: If E19 recurs frequently, a technician should check gas pressure, ignition components, and combustion settings.