Kipp&Zonen CVF4 Ventilation Unit - Manual (Page 23)

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Instruction Manual - CVF4
6. Trouble shooting
Malfunction Cause Check
Ventilator and heater do not work
Ventilator does not work
Ventilator does not work
Heater does not work
Power failure Check 12 VDC and/or mains voltage
Mechanical obstruction Clean filter and/or remove obstruction
Electrical failure Check fan impedance ~30 Ω
Resistor defective Measure power resistors:
Specifications: 15 Watt and 50 / 39 Ω