Hi Mike,
Did you turn the breaker in the external heater compartment to "ON"?
You need to pull out the safety clip in the circuit breaker handle in order to operate it. Remove the outside wall cover/vent with the "twist" latch to expose the drain, the gas controls and in the circuit breaker in lower left corner of the compartment.
Your inside switch red light glows whether the external circuit breaker is on or off.
Save the clip to reinstall at the end of the season so that you don't accidentally turn on the heater without water.
Let us know if that solves the problem.
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