Hayward 116k BTU HeatPro Digital Heat Pump HP21003T Logo
Posted on Jul 03, 2010
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OP error code. What is wrong with my Hayward pool

OP error code. What is wrong with my Hayward pool heater?

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  • Master 1,940 Answers
  • Posted on Jun 24, 2011
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OP is the error code for a faulty Temperature Sensor. Try replacing the Temperature Sensor. I have seen many of these units have the wires chewed up by mice, etc., so you may want to check the wiring for any damage.

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