Emerson NT5C06D user manual Troubleshooting, Alarm indication RFA fault

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6. Troubleshooting

Alarm indication

RFA fault

Table 9 - System fault diagnosis

Fault symptom	Possible causes
RFA	No AC input or input out of bounds.
	No AC input or input out of bounds.
	AC Input/DC output circuit breaker is open.
	Rectifier has received a HVSD signal from the
	controller.
	An internal high voltage shutdown (HVSD) has
	occurred. The internal High voltage shutdown point set too
	low (below float or equalize setting).
	Excessive impedance in one or both sense leads.
	The cooling fan is failed.
	DC circuit breaker is open.
	A thermal shutdown has occurred.
	Defective unit.
	Excessive ambient air temperature.
	Air inlet/outlet blocked, clogged air filter.

Helios Rectifier 25/48NT5C06D Installation and User Manual