Fault diagnosis DAC Professional
Fault 21: Preheating
FAULT 21 Preheating
Triggered by:
The monitoring time limit Uet11-Uet16 from switching on the preheating until reaching the necessary temperature
has been exceeded
Causes/ Remedy
Operating fault/Checks by personnel:
•
Mains electricity voltage too low: Check mains supply installations
•
Appliance is cold, door not closed properly during preheating
Appliance fault / Repair by technical service personnel
►
Control unit Preheating Output ACOUT2 is faulty
Check in "Diagnosis-Program":
Switch on output ACOUT 2, (the LED for this output lights up),
Measure voltage at output ACOUT2
►
Overheating-protection Preheating faulty
•
Control unit permanently open
•
Control unit switches too soon, and stops heating power:
Measure voltage behind the control unit during the program
►
Preheating faulty
In the "diagnosis program" switch on output ACOUT2, measure voltage directly at the connection to the
preheating (voltage but heating remains cold), or check current through heating
Until a repair is possible, as a temporary measure set the FLAGS F5=0 to deactivate the preheating and
the associated malfunction report.
09/21/2006
34/61
Servicemanual DAC Professional
Summary of Contents for DAC PROFESSIONAL
Page 1: ...b a PROFESSIONAL p j...
Page 7: ...Figure 4 Back view 09 21 2006 5 61 Servicemanual DAC Professional...
Page 56: ...Sirona DAC Professional Process 09 21 2006 54 61 Servicemanual DAC Professional...
Page 60: ...Valve diagram 09 21 2006 58 61 Servicemanual DAC Professional...
Page 64: ......
