Heater not going on
SOURCE: Hayward H300 Spa Heater will not fire up
try to replace the thermo sensor it is located on the left side of tghe unit and has 3 wires running to it.
SOURCE: Hayward H250 FDP Pool heater won't stay lite
sounds like a flame sensor.remove ignitor assembly and clean with fine emory cloth or steel wool.when properly cleaned it should feel smooth for entire length of sensor
SOURCE: same problem pool heater shows hayward pool heater bo error
BO means that you have bypassed operations. ie automation. if no automation is present then press and hold the Down arrow and Mode button for 3 seconds.
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: pool heater shuts down indicates SF code
Temperature sensor failure code.Check the wiring on the sensor or might be a bad sensor. Here is the link for the heater manuals. This is a general code depending on Make and Model...
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