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].
Isolation Steps:
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Place a DC voltmeter with the negative lead on terminal 1 and the positive lead on terminal 52 (Page 84) [1].
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Verify if the voltage is fluctuating between 0 and 2.5 volts; this is the normal range (Page 84) [1].
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Disconnect field wiring from the panel one by one until the meter returns to the normal range to identify the shorted wire (Page 84) [1].
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Alternatively, enter Accu-Zone Troubleshooting (Mode 25) by pressing 25 ENTER + Code (Page 88) [1].
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In Mode 25, check Channel 31; a normal reading fluctuates between 1 and 9 (Page 86) [1].