Micro Autonomations LLC – Fan Controller v3
16
Document Rev 1.0
Reset all variables:
Press and hold both
Prg
and
Skip
together for 10 seconds, until both the Status and Error LEDs turn
Orange, and then release both of them. This will reset the saved temperature points, saved sensor, and
the saved temperature range.
Error Modes
When an error is detected, the Status LED on the controller, and the Remote Status LED (if installed), will
blink a repeating error code. This code consists of the following number of blinks in a row, followed by a
brief pause, then the code again. Only one code will be shown at a time. During each error mode, the
fan will be commanded to run at full speed.
Code
Problem
Solution
2
Current sensor does not match
the stored sensor
-
The active temperature sensor (EFI or
standalone) is stored during programming. If
the detected sensor changes to the other
sensor, the fan will operate at full speed until
reprogrammed with the new sensor, or until
the previous sensor is hooked up again.
-
The sensors are assumed to be missing if their
voltage is below 0.25v, or above 4.9v.
3
Neither sensor is installed, or
one/both are grounded
-
If the active temperature sensor is shorted to
ground, or the wire breaks open, the fan will
operate at full speed.
-
Verify that all temperature sensor wires are
connected with no shorts to ground.
-
If piggybacking on an EFI sensor, verify that the
correct wire was tapped into. Often, one wire
will be ground, and the other will have the
variable voltage signal.
-
For a single terminal sensor, verify a good
connection between the sensor body and
ground. Using tape or sealant on the threads
may prevent it from working properly.
4
Spread between turn on and
75% temperature points are too
close to each other
-
The controller requires at least 0.1v between
the turn on and 75% temperature points. Try
re-programming with the turn on point lower,
and/or the 75% point higher.
