Ensure you are keeping the “PILOT/IGN” button pressed down for a minimum of 10-seconds. You will hear the clicking noise of the ignitor and the heater should then light. You can repeat this by waiting 30 seconds between attempts, but do not repeat more than 3 times. If the pilot does not spark, try replacing the ignitor battery. It is important to ensure you have the heater serviced before each season, if it continues to fail to ignite contact an authorised service technician.