Water flow sensor slow drip leaking;
Either take out and reinstall with teflon tape or replace with new using teflon tape on threads
SOURCE: my hayward H series above ground heater. Will not keep heating.
Sounds like the heat exchanger is sooted up. Desoot...messy job but sounds like you know your way around the heater
SOURCE: Hayward H300 heater runs but will not heat water
Your internal by-pass could be stuck open or the disc could be worn to the point of letting water pass too fast. Or your thermal control valve could be stuck open. These are both found in your water header going into the heater. Hope this helps, good luck.
SOURCE: Hayward H250K gas pool heater error code
Low Flow errors are not necessarily real. They can be caused by improper adjustment or a defect of the pressure switch. Locate the pressure switch. Verify that the "switch" makes contact. Adjust the dial, reducing the distance the switch has to travel to engage. This will effectively lower the operating pressure required to operate. Keep adjusting until the unit stays on.
SOURCE: Hayward Model H250IDL is leaking water from drain valve.
Water leaking from the heater is not a good sign. This is an indication of a leaking heat exhanger. The heat exchanger will have to be replaced and the part is made of copper. It is very expensive, depending on the age, you may just want to replace the entire heater. Exchangers usually leak due to bad water chemistry.
AO will apply to your blower, blower tubing, or blower vacuum switch. You need to check these items.
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