Appendix - General; Supply Fan Failure Codes; Hll = Hall Sensor Error; Tfei = Electronics Interior Overheated - Daikin MicroTech III DPS Installation And Maintenance Manual

Supply Fan Failure Codes

HLL = Hall Sensor Error

First occurrence:

Power fluctuations may be responsible.
Corrective: Reset the failure; re-start the motor and observe it. If applicable, filter out the source of the disturbing voltage.

Repeated occurrence:

Question:
Do other fans show the same failure?
Yes: Systematically search for voltage peaks .
No: It seems to be a hardware problem of the fan . Fan need to be replaced .

TFEI = Electronics Interior Overheated

First occurrence:
Too high ambient temperature may be responsible .
Question: • Could ambient temperature have been too high?
• Is it possible to connect the fan to EC Control in order to display the temperature? If so, is the displayed
temperature within the expected temperature range?
Corrective:
If the displayed temperature is above 95°C (the electronics switches off at 105°C,) double-check the ambient
temperature in each operating mode .
Reset the failure; re-start the motor and observe it .
Repeated occurrence:
Question:
Do other fans show the same failure?
Yes: Systematically search for the cause of excessive ambient temperature . Perhaps use a data logger or read out
the electronics temperature via EC Control .
No: It seems to be a hardware problem of the fan . Fan need to be replaced .

TFM = Motor Overheated

First occurrence:
Excessive ambient temperature may be responsible .
Question: 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 motor temperature?
• Is the displayed temperature within the expected temperature range?
Corrective: If the displayed temperature is too high:
• Double-check the motor temperature in each operating mode .
• Check of the fan load: 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: systematically search for the cause of excessive ambient temperature . Perhaps use a data logger or read out
the electronics temperature via EC Control .
No: It seems to be a hardware problem of the fan . Fan need to be replaced .
OM 1263 • MICROTECH UNIT CONTROLLER 100
Appendix – General
Appendix – General
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