Unable to light pilot Gas supply turned off Turn on gas supply Gas **** knob dial not positioned correctly Check lighting instructions. Set control knob Defective thermocouple Check and replace thermocouple Defective safety magnet assembly Check and replace gas valve Pilot burner orifice clogged Clean or replace Pilot tube pinched or clogged Clean, repair or replace Poor thermocouple connection Check and tighten Air in gas line Purge air from gas line Thermostat's single use ECO is tripped Check ECO and replace gas valve Gas valve defective Check gas valve