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What causes the error code CLF on an ATS48?

Published date: 06 August 2019

What are some possible reasons for getting fault code CLF on an ATS48?

Product Line:
Altistart 48

All models

CLF error in the display.

The ATS48 monitors the control power on CL1/CL2.  If the voltage experiences a sag below 44Vac for more than 200msec, but returns quickly enough for the internal power supply to ride through, then the ATS48 will fault CLF.

Verify the presence and stability of power on CL1/CL2.

ATS48 internal causes may include:

Control terminal not seated properly
Wiring from control board to power board J4 plug
Defective/failed power board

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