CAUTION: For your safety, DO NOT attempt repair of electrical wiring, controls, heating elements, or other safety devices. Refer repairs to qualified service personnel.
Possible Cause: No power or incorrect wiring
What To Do: Check breakers at the main electrical panel to ensure it is not tripped. If tripped, reset the breaker. Check that the water heater is wired correctly.
Possible Cause: Overtemperature protection has been triggered
What To Do: The water heater is equipped with software that turns off the heating elements when water temperatures reach a dangerous level. Turn off hot water, wait several minutes for water to cool.
Possible Cause: Flow rate is too low
What To Do: Each model water heater has an activation flow rate. If the water flow is less than this flow level, the unit will not heat water. Increase the flow rate.
This answer is applicable for the following models: GE04SNLPDG, GE06SNHPDG, GE08SNHPDG, GE11SNHPDG, GE15SNHPDG, GE18SNHPDG, GE24DNHPDG, GE27DNHPDG.