A heater should turn on with little effort. If you find your unit is struggling to start, it is time to troubleshoot the problem heating repair pawling. This may be the result of a dirty or faulty pilot, a problem with the natural gas line, disconnected wiring, dead batteries, or a damaged thermostat. It is important to avoid installing a thermostat in direct sunlight, near hot appliances, or vents. Doing so may cause skewed temperature readings.