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TROUBLESHOOTING
PROBLEM
Display reads "Er0"
(lost memory)
Display reads "Er1"
(shorted sender)
Display reads "Er2"
(open sender)
Display reads "Er3"
Display reads "bAt"
when attempting to go
into setup
Display alternates
between "Lo" and "bAt"
Fan turns on early,
late, or not at all
CAUSE
Setup memory lost, unit needs to be
recalibrated
Wrong gauge selected
Gauge disconnected from sender
(gauge option only)
Sender is shorted
Unit not connected to sender
Wrong gauge selected
Sender not connected
Unit not connected to sender
Setup data is out of valid range
+12v terminal does not have
constant power
Battery voltage dropped too low
during key off extended fan on time
Unit has no constant power.
(Display will not show anything
when SW1 is held)
Unit has no keyed power.
(dot on display flashes rapidly when
SW1 is held)
Broken/shorted wire to sender
Wrong gauge is selected
(gauge setup)
Wrong sender used
(for no gauge setup)
Wrong bus type set
(for BIM gauge setup)
On temperature in setup is too high
Fan not connected properly
Display shows "SPd". Speed shut-
off is set too low.
Alternator overcharging
(Analog gauge applications only)
SOLUTION
Go through setup procedure, (see setup in this manual).
Select proper gauge in setup or use custom cal if
needed.
Reconnect gauge to sender.
Check sender wire for short to ground, look for pinched
sender wire or bare connection touching ground.
Connect SENDER terminal on unit to sender circuit.
Use setup to select proper gauge, or use custom cal if
needed.
Reconnect wire to sender.
Connect SENDER terminal on unit to sender circuit .
Go through setup again, custom cal may be incorrect.
Connect +12 BAT terminal to fused battery connection.
This terminal should have constant power at all times.
Ensure battery is fully charged. Check and replace weak
battery. Shorten fan delay time to prevent excessive
battery drain.
Connect +12 BAT terminal to constant power and
GROUND terminal to a good ground.
Connect IGNITION terminal to a circuit powered when
the key is on.
Check wire to sender for breaks or shorts and repair.
Hold SW1, if temperature read is lower than expected or
doesn't match gauge, redo setup.
For sender only applications ONLY a Dakota Digital
300ºF sender can be used. Other senders may not give
a correct temperature reading.
For early VFD3/3X systems select BUS – SL2 to read the
temperature correctly.
Hold SW1, if temperature read is above the desired on
temperature, and fan is not running, redo setup.
Remove fan output from unit and short wire to ground. If
fan does not run, check relay and fan connections.
Turn off or raise the high speed disable setting.
Use a voltmeter to measure the voltage at the battery
while the engine is running. If this voltage is above 15v
the unit may turn the fan on later than expected. Either
correct overcharging problem or set on temp lower to
compensate.
MAN# 650411:B
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