What does the P3 (Earth Ground Fault) trouble code mean on the SK-5207, and how do I isolate the fault?
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A P3 trouble indicates the panel has detected a short between earth ground (terminal 52) and circuit ground, which includes terminals 1, 10, 20, and 25 (Page 84) [1].
To isolate the fault:
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Place a DC voltmeter with the ground lead on terminal 1 and the positive lead on terminal 52 (Page 84) [1].
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Check the reading; a normal state should continuously fluctuate between 0 and 2.5 volts (Page 84) [1].
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Remove field wiring from the panel one circuit at a time and leave it off until the meter returns to the 0 to 2.5-volt range (Page 84) [1].