info@motorvac.com www.motorvac.com
Troubleshooting and Additional Help
Refer to the list below troubleshooting assistance.
Problem
Possible
Cause
1. Unit does not power-up. No LED’s are
illuminated
Polarity is reversed on vehicle battery connection.
Check connection to battery for a loose condition.
Circuit breaker may be tripped. (Automatic reset).
Faulty battery
2. Start light does not stop blinking when the
engine is started.
Observe pressure gauge to see if fluid/pressure is
reaching the machine.
CLEAN FLUID
and Inlet hose may be reversed.
Vehicle may have to be placed in neutral to achieve
pressure. Vehicle may be of a low pressure design
or have a thermostat
3. Fluid is not going into the Waste tank during
inline service.
If the
DRAIN
LED is on (indicating unit should be
draining), and there is pressure reading on the
gauge, but no fluid is going into the waste tank
then the solenoid valve is not ‘switched’. Solenoid
requires a good 12 volts. Low battery voltage,
defective power cable or poor wiring connector
between the board and solenoid can cause this
problem.
4. The unit performs poorly.
Verify that the tank filter screen has recently been
cleaned. (Refer to the maintenance log in to view
dates of services performed.)
5. When first connected to a battery, all the unit’s
lights remain on and gives a steady tone.
Verify good battery voltage (12.5 volts) and
connection.
Unit will not operate off a booster pack. Connect to
a new fully charged battery and try again.
Check wiring for damage
6. Unit will not start. Light (LED) on below the ‘fill
switch’
Check for residual pressure on the gauge. Pressure
in the dirty hose or defective pressure switch or
wiring.
14
