OP error code. What is wrong with my Hayward pool heater?
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.
I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514
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