If you simply can’t get your patio heater to light when you turn it on, it is possible to light it manually. Granted, this needs to be done carefully, and, in the long run, you should either investigate the cause or see if a replacement part is necessary. Using a lighter or a match, you’ll need to hold the primer for 30 seconds before lighting the pilot. Waiting for 10 to 15 seconds before flipping on the switch from low to high will also increase your chances of success. Follow this Step by Step Tutorial For Manually Lighting A Patio Heater.