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www.DaikinApplied.com 141 OM 920-6 • MICROTECH UNIT CONTROLLER
TFE = Power Mod Overheated
First occurrence:
Excessive ambient temperature may be responsible.
Question: • Do other fans (temporarily) show the same failure within the arrangement? Could ambient temperature
have been too high? Or is the motor overloaded?
• Is it possible to connect the fan to EC Control in order to display the temperature?
• Is the displayed temperature within the expected temperature range?
Corrective: If the displayed temperature is too high:
• Check the module temperature during operation in each operating mode (Tmodule <110°C;
switching-off temperature 115°C)
• Check the fan load and supply voltage: Measure the input power at max. load/ operating point and
compare the measured value with nominal data on the label. Is there any discrepancy?
• Reset the failure; re-start the motor and observe it.
Repeated occurrence:
Question: Do other fans show the same failure?
Yes: Systematic search for the reason of too high ambient temperature, overload, overvoltage or low
voltage. Perhaps use a data logger.
No: It seems to be a hardware problem of the fan. Fan need to be replaced.
BLK = Locked Motor
First occurrence:
Question: • Is it possible that the motor was locked by an obstruction or ice?
• Do other fans show the same behaviour?
Corrective: Remove the reason for blocking. Caused by ice: activate the shake-loose functionality (starting with
ModBus 5) or increase the starting phase control factor.
Repeated occurrence:
Question: Does increasing the starting phase control factor improve the situation?
No: It seems to be a hardware problem of the fan. Fan need to be replaced.
SKF = Communication Error
First occurrence:
Power uctuations may be responsible.
Corrective: Reset the failure; re-start the motor and observe it. If applicable, lter out the source of the
disturbing signal.
Repeated occurrence:
Question: Do other fans show the same failure?
Yes: systematic search for peaks of disturbance voltage
No: It seems to be a hardware problem of the fan. Fan need to be replaced.
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