Sounds like a bad cap in the delay timing circuit that detects valleys
in the voltage/Peaks in surge currents.
This normally shuts down the unit in the event of a voltage sage due
to an excessive unexpected load on the PS.

This problem would also cause it not to start properly if the main
caps are totally discharged and there for, is taking to long on the start
to charge them for what the current existing delay is at due to a faulty
cap in the delay protection circuit.

-=-=-=-

Turn-off after 5 seconds is a bit long for a surge or slow cap-charge error,
isn't it?

This cap is normally a small type. You may want to look into that.

Without wiring diagrams, how would one go about locating such a cap?
--
DaveC

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