To test the operation of the ventilation unit heaters:
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Select Settings:
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Use the arrow buttons to select Service menu:
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Select OK:
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Use the arrow buttons to select Heater test:
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Select OK:
The Heater test 1/2 display opens:
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Use the Up arrow button to enable post-heating.
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Make sure that the post-heating is working. Operation can be ensured either by measuring the output or by observing the temperature of the defrosting resistor.
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Use the Down arrow button to disable post-heating.
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Select Right arrow.
The Heater test 2/2 display opens:
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Use the Up arrow button to turn on the additional heating resistor.
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Ensure that the additional heating resistor is working. This can be done either by measuring the output or by observing the temperature of the additional heating resistor.
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Use the Down arrow button to turn off the additional heating resistor.
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Select Back:
The heater test is now complete.