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e. Thermocouple defective - replace. f. Gas control defective - replace. 4. Main burner does not ignite. a. Main burner orifice is blocked - clean, see "Appliance Maintenance," above. Inlet gas pressure too low, contact gas supplier. 5. Heater keeps shutting "OFF" during normal operation. a. Pilot is blocked - clean pilot, see Page 11. b. Inlet gas pressure too low, contact gas supplier Page 12 R-2688 PARTS LIST PARTS LIST PLEASE NOTE: When ordering parts, it is very important that part number a