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Fault Cause Remedy
HTI lamp dark after ignition Thermofuse in ballast Switch on unit for cooling
or in lamp housing has reacted (without switching on HTI lamp).
Allow 2 minutes for cooling off, then briefly switch
off and on with mains switch. Re-ignite HTI lamp.
Ventilation fans not operating Call service engineer.
HTI-Lamp “ON” but not functioning Master Control Knob not in “0” position Turn Master Control Knob to “0” position
Electronics disturbed Carry out mains reset.
Switch unit off for approx. 30 seconds.
Then switch on again and start new ignition attempt.
If this fails, call service engineer.
HTI lamp defective Replace HTI lamp
(experienced personnel only).
Fuse defective Call service engineer.
Keyboard illumination and/or display dark Control voltage failure Call service engineer
Trouble-Shooting