Surge Protection / Electrical Management (EMS) error codes

20 codes from 2 manufacturers, each with its meaning and the document it comes from. Open a code for the details, or search every system.

Hughes Power Watchdog EPO (9)

• E1Line 1 voltage error - park voltage on line 1 rose above 132 V or fell below 104 V, so the Watchdog cut power…
• E2Line 2 voltage error (50 A units only) - park voltage on line 2 rose above 132 V or fell below 104 V, so the…
• E3Line 1 overcurrent - the RV drew more than the unit's amp rating on line 1 (30 A or 50 A model); the park…
• E4Line 2 overcurrent (50 A units only) - the RV drew more than the unit's amp rating on line 2; the park…
• E5Line 1 and neutral reversed - the park pedestal has a hot and neutral wire swapped. The Watchdog will not…
• E6Line 2 and neutral reversed (50 A units only) - the pedestal has a hot and neutral swapped on line 2. The…
• E7Missing ground - the source has no ground connection, so a hot-to-chassis fault would not trip a breaker…
• E8Missing neutral at the coach - the Watchdog sees no neutral circuit INSIDE the RV (after the Watchdog), not…
• E9Power Watchdog surge module used up - the WatchDog logo and the E9 code turn RED; the surge protection…

Progressive Industries EMS-PT (11)

• E 0Normal operating condition - AC source is correctly wired and within limits; safe to use.
• E 1Reverse Polarity - the hot and neutral lines are reversed; the EMS will not provide power to the RV.
• E 2Open Ground - the earth ground wire is open or neutral and ground are not bonded; power will not be provided.
• E 3High Voltage (EMS-PT30X) / Line 1 High Voltage (EMS-PT50X). Stepped shutdown: >132V & <140V after 3 s; >140V…
• E 4Low Voltage (EMS-PT30X) / Line 1 Low Voltage (EMS-PT50X) - AC line voltage dropped below 104V for longer than…
• E 5Line 2 High Voltage (EMS-PT50X, 50A service) - overvoltage on the second 120V leg (same stepped thresholds as…
• E 6Line 2 Low Voltage (EMS-PT50X, 50A service) - undervoltage on the second 120V leg (below 104V for 6 s).
• E 7High Frequency - AC frequency above 69 Hz (normal 60 Hz); EMS shuts down power.
• E 8Low Frequency - AC frequency below 51 Hz (normal 60 Hz); EMS shuts down power.
• E 10Surge protection damaged/depleted - the internal surge devices have absorbed a surge and are no longer…
• PEPrevious Error Code - shows what error last occurred and why power was interrupted (e.g. PE3 = previous E 3…