I get the E04 code, but my fan on my Mimimax NT 400 is running fine. Start-up sequence seems fine. Heat LED comes on, a tiny squeak sounds like the gas valve opening, LED goes out after about 5 seconds, and there is no ignition. Fan keeps going strong through this process until heater eventually shuts down and displays error code.
Checking at night, there is no glow at the burners to indicate that ignitor functions. There are to probes that extend into the firebox area. One over burner 3 with two wires (counting left to right) and one over burner 4 with one wire. Which is the sensor, and which is the ignitor? Thanks!
The HSI (ignitor) has 2 wires, its like a cigeratte lighter, power is applied and it heats then glows red, the single wire you mention is the flame sensor, used by the control board (igntion module) to ensure the burner has lit or it shuts the power to the gas valve off but keeps the fan operating for a period of 1 hour till it resets.
It sounds like your ignitor is defective, it happens often, depending on your location, you may be able to purchase one, but I would advise having a service tech do it.
The manual for troubleshooting and repair can be found at this link:
http://www.staritepool.com/pdfs/MiniMaxNTServiceManual.pdf
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