Nilfisk-ALTO Neptune PE Service Manual page 26

D
Function
Functional desription of Circuit Board, A1—Continued
The flame sensor B7 is controlling if the fuel is ignited, and if it is (the flame sensor can see the
flame) it "allows" the burner to burn.
If the flame sensor don't see the flame after 4 sec. (when S1 is in hot water mode), the fuel solenoid
valve will close, and the burner will be stopped.
If the display is flashing in the LED's, it can be due to too low RPM on the motor.
If the LED's are flashing, it means that the voltage is too low to maintain the circuit board.
The flashing LED's means that the display is "re-starting" all the time.
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NEPTUNE PE-DE_en_Ver.1.0_October 2010
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