SOURCE: Pool heater will not heat
Im no pro, but I know there is an air sensor behind the main board. If the fan is running you probably have a problem with that sensor. If your lucky the air hose could have just popped off.
SOURCE: Pressure SW LED lite and ERR error code with
either you have a problem with the pressure switch or your filter is very dirty or your impeller is clogged. make sure the flow is good, then check the pressure switch.
SOURCE: Heater Mini Max
E04 is an airflow fault. You should hear the fan come on. If not, the fan is bad. If so, then your problem is electronic and beyond the scope of most DIY'ers
SOURCE: Code E05
E05 and E06 is the error codes for a faulty stack flue sensor. try changing the sensor first is the cheapest. if that doesn't work check for corrosion on control board in which case will have to change out board.
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