OWNERS MANUAL 17
ERROR CODES AND MESSAGES OF SELF
DIAGNOSTIC PROGRAM
When the microprocessor of a F1 chair detects a fault it tries to inform about the most probable
reason. The error code is showed on the display of the chairs rear panel.
Starting from program version 6A.8B the program version is showed on the display when power to
the chair is switched on. This information can also be helpful when trying to find reason for a
problem.
In error codes there are two numbers (shown after each other) and the numbers are showed twice.
Error codes which start with number 1 are for lifting motor, 2 is for backrest motor and error codes
starting with 5 are for potentiometers.
It must be noticed, that no matter what error code is shown, the reason might be elsewhere.
Example: Fault code 50. A wire to the potentiometer of the lifting motor is broken or the
potentiometer is defective. The problem might be on the main pc-board, wires, on a terminal
connector, connector between the wires and pc-board, connector between the wires and
potentiometer or the potentiometer.
In case several problems occur at the same time the processor informs about the problem, which has
lowest number, for example when the voltage is low, the showed error code is 10 (not 20).
Error codes
10, 20: Low voltage (or missing) for motors
12: A wire to the lifting motor is broken
13: Wires to the lifting motor are shorted
22: A wire to the backrest motor is broken
23: Wires to the backrest motor are shorted
50,51: A wire to the potentiometer of the lifting motor is broken or the potentiometer is defective.
52,53: A wire to the potentiometer of the backrest motor is broken or the potentiometer is defective.
If the potentiometers are mechanically turned to its maximum or minimum values, these
same codes are displayed.
54,55: Lift (54), backrest (55): Movement limits too near each other or too near mechanical limit
{from ver. 6A8B6}
56,57: Lift (56), backrest (57): Some unlogic in the limits (e.g. upper limit < lower limit) {from ver.
6A8B6}
11, 14, 15, 16, 21, 24, 25, 26: Main printed circuit board is defective.
E, EE: (EEPROM) EEPROM is defective. Error message E is shown also when a position is tried to
be stored on channel 1 ( backrest down).
U: (Unit) Unit-adapter is connected to the chair, but the main processor can't get any reply from
the unit. Same error message comes, if instrument is picked up before turning power on.
Notice, that after "U"-error, the unit can't be used. Before power is switched OFF or safety -
switch is shortly activated.
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