VN/87plus Fault Indication

Fault indication on LED-display

Click on fault indication link to view maintenance procedure


Fault location has to be done when the engine is stopped!

Negative pressure/airflow is too low.

Voltage of internal battery is too low.

Ambient temperature is too low.

Step 1:

Engine compartment ventilator lows cold air into the device. Change blowing direction of ventilator away from the OMD. Check measuring head heating if this component is defect.

Ambient temperature above 70 °C.

Step 1:

Protect device against sources of heat radiation.

Electronic temperature too low.

Step 1:

Check if engine room ventilator blows air directly at the OMD device. Change blowing direction of the ventilator to ensure that cold air is not directed at the OMD device. Check measuring head heating if this component is defect.

Electronic temperature too high.

Step 1:

Protect device against sources of heat radiation, install metal heat shields against radiation if necessary and improve fresh air circulation.


Switch for adjusting sensitivity defective.


No power on the unit.


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