Pool Heater Not Working: Igniters, Sensors, Switches & Control Boards
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Sticker on the pump body (the part with the basket), not on the motor. Motor labels from Century, A.O. Smith or Regal won't match parts.
Label on the side of the tank near the base. Size is in sq ft, e.g. 420 sq ft = C4030 or CCP420.
Rating plate inside the front access panel. Note the BTU and gas type (NG or LP).
Molded into the body or printed on top. Robotic cleaners: on the power supply.
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When a gas heater will not fire or shuts down, the usual culprits are the igniter, flame sensor, water or air pressure switch, thermistor, high limit or gas valve. Grouped by brand: Hayward H-Series, Jandy JXi / LXi / JXiQ, Pentair MasterTemp / Max-E-Therm / ETi, and Raypak Digital / Avia / Low NOx, plus Swimables aftermarket equivalents.