Electronic error codes
HTC 420 VS
26 2.0
Error code Cause Action
tnF tnF = Autotuning fault
May arise if the motor has been
replaced by the wrong motor, which
is outside the norm values for the
converter. May also arise if the
motor is broken.
Check the motor. Replace the motor
with an original motor.
OLF OLF = Overload motor
Occurs when the motor is
overloaded for a prolonged period.
The motor protection in the
converter trips in order to protect
the motor.
Switch off the machine. The motor
protection must cool.
Wait 8 minutes before the machine
is restarted.
OSF OSF = Over-voltage
Mains voltage too high or
disturbance in the mains supply.
May occur if large motors/machines
are switched on or off in the
vicinity. May be due to non-CE
marked equipment.
Measure the supply voltage. Change
the socket. The max. permitted
supply voltage is 240V + 10%.
USF USF = Under-voltage
Voltage too low due to large number
of consumers using the network.
Temporary drop in voltage. Long
and/or weak cables may also cause
this fault.
Replace the socket or remove some
of the consumers from the network
(welding, etc. causes such faults).
ObF ObF = Operating load when stopped
Arises if the grinding discs are
running when the machine is to be
switched off.
Check the power supply to the
machine, i.e. the fuses and cable. If
the machine still does not function
after the power supply has been
checked, the fault may be due to a
fault on the contactor in the machine
or in the control panel. In this case,
contact HTC Service Centre.
PHF PHF = Mains supply phase break
PHF flashes in the display for a few
seconds before it goes out. Occurs if
someone has pulled out the cord.
Check the power supply to the
machine, i.e. the fuses and cable. If
the machine still does not function
after the power supply has been
checked, the fault may be due to a
fault on the contactor in the machine
or in the control panel. In this case,
contact HTC Service Centre.
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