The system has determined that the fan should be running due to the internal temperature of the unit, but cannot detect that the fan is actually running.

It is important to keep the fan inlet and exhaust ports clear of obstructions. The cooling fan will vary the speed in relation to the internal temperature of the instrument (refer to Figure: Fan Speed vs. Temperature). The fan will turn on at low speed when the internal temperature of the instrument reaches 44º C, and will increase the fan speed to maximum at 54º C. As the internal temperature of the instrument decreases, the fan will reduce speed until the temperature reaches 39º C, at which point the fan will turn off.

The internal temperature has reached an excessive level, 85º C. Verify that the ventilation openings are unobstructed and that the fan is running. Internal temperatures may be manually verified by using the SELF TEST function. Turn off the unit and allow the temperature to cool down. If the fault is not resolved and the internal temperature reaches 90º C, then a countdown of 10 seconds will begin. The countdown gives the user a chance to save the current setup before the instrument turns itself off (before internal temperatures can cause any damage). If the error persists after removing any obstructions and allowing the unit to cool, then reset to the factory defaults with Factory Defaults Reset: (Esc + On), or
Master Reset: (System + On).

Attempted to perform an operation on a recalled trace. Many operations are valid only on a live or active trace.

Power Supply failed. Charge the battery.

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