My propane heater won't light:
Your pump must be running and water circulating through the heater before it will light. The electric breaker that controls the heater must be on. The on/off switch on the heater must be in the on position. If you listen carefully, you may be able to hear the ticking of the electronic ignition trying to light. Make sure the temperature dial on the heater is turned up. Check the valve at the tanks and make sure your heater is using a tank that has gas in it. If you just had your tanks changed, the gas line may have air in it and it will take about 10 to 15 attempts by the heater to light before the air is purged out of the line. A heater will typically try to light 3 times automatically. If it is unsuccessful in those 3 attempts, it will shut off and stop trying. If that happens, turn the switch off and back on to reset it so it will try again. You can manually purge the gas line by undoing the pipe union at the heater but we don't recommend you do that unless you are familiar with gas systems and plumbing. You can also call the gas company that delivered your gas and ask them to come back and purge the lines.

My natural gas heater won't light:
Your pump must be running and water circulating through the heater before it will light. The electric breaker that controls the heater must be on. The on/off switch on the heater must be in the on position. If you listen carefully, you may be able to hear the ticking of the electronic ignition trying to light. Make sure the temperature dial on the heater is turned up.