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We did not get from you, other than a classification by the forum of what kind of heater you have.
An E04 is a common error on Pentair MasterTemp heaters. It is saying that the heater is not closing the air pressure sensor = normally bad fan. But...
It just means that the fan is not coming on and blowing air to trigger the Air Pressure Switch. Could be:
Bad fan motor
Maybe just a bad 5MFD motor capacitor - much cheaper.
See pic: Silver thing on the right side of the motor
Possibly rusted out squirrel cage?
Or even a disconnected wire/plug. Check to ensure the plug is in all the way and good connection. See Pic below: Just under the motor you can see the square white thing, that is a 2 part plug that will unplug. The left side of that is in the inside of the heater cabinet, inserted in the back metal wall, and the wires go where they go. You won't need to mess with those. When you lift off the top of the heater, the blower assembly will be visible and the plug will just need to be unplugged. From that white plug assembly, from the right side on, the whole assembly will disconnect power connectivity. Then undo the 4 screws that attach to the heater and the whole blower assembly will lift right out.
Burned wire or wires for fan connection
Check all of this out.
btw... the blower looks like the pic below.
The firmware message is the firmware on the wall mount control. The wall control would seem to be getting power, giving you the firmware rev only. Your communication with the main board has been lost, broken wire, main board has gone bad or for some other reason can not receive and instruction from the main board. If you have a spa side control, if spa side works then board may be ok, look for bad wire. If spa side is not working disconnect and power cycle the system and try the wall mount with spa disconnected. You may only need to replace the main board. More info on your system would be needed in order to suggest the proper replacement.
check red 4 pin connectors to see if any wires touching if not make sure wires are tight also make sure wire isnt cut or knicked sometimes landscapers do it not knowing seems like shorted wire if you can take controller with shorter wire and try next to aqualink if it works bad wire if not bad controller
One of two things could be wrong. The easiest is that the spa water temp sensor attached to the plumbing is bad or the wire to it could be damaged. Try replacing the temp sensor. The diagram inside the control panel door tells you which wires to remove from the green pin connector. If this still does not work then the outdoor control board could be bad.