Response to Hello Phil and thank you for your question. Per Hayward's instruction manual, if 24VAC is not present, gas valve relay on control module is defective. Replace control module. Feel free to consult Hayward directly at 888-429-9273 to confirm. The Hayward online manual for your H250 Heater can be reached with this link. If there is anything else I can assist with, please e-mail me back. Thank you, Alan.

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