Read the brand, model, current code and output status together. A message may describe an active supply problem, a stored event, an RV-side fault or the protector itself. A code alone does not prove that the pedestal is at fault, or that the unit has disconnected power.
Before you read the chart
Record the full scrolling sequence and whether the RV has power, if it is safe to do so. A reconnect countdown is different from a persistent fault. Do not touch damaged or overheated connectors or keep an unsafe supply energised just to collect a code; have it isolated safely.
Progressive Industries E-codes
The references are Progressive’s PT30X/PT50X manual and HW30C/HW50C manual, manufacturer documents hosted by third parties. Use the manual for your model; Line 2 codes apply to the 50A versions.
| Code | Meaning | Response |
|---|---|---|
| E0 | No current error reported | Check output status and any reconnect delay. |
| E1 | Reversed hot and neutral | Stop using the connection; report it. |
| E2 | Open ground | Have the grounding path checked. |
| E3 / E5 | High voltage on Line 1 / Line 2, above 132V | Do not bypass; investigate the supply. |
| E4 / E6 | Low voltage on Line 1 / Line 2, below 104V | Check supply and load conditions. |
| E7 / E8 | Frequency above 69Hz / below 51Hz | Diagnose with the model’s manual; do not assume a generator-only fault. |
| E9 | Data link down on HW models | Persistent errors need support; a brief startup E9 can clear on the next display cycle. |
| E10 | Surge protection needs service | Contact Progressive; this code alone does not stop output. |
The PT30X/PT50X chart does not list E9. The HW manual lists it for the remote display link. Open neutral may produce no illuminated display, so an unlit screen is not proof of a failed protector. For voltage-trip timing, see the Progressive review.
Current fault versus previous fault
Illustrative sequence for Progressive EMS-PT30X/PT50X. E and PE are separate fields in the scrolling display, shown together here so you can compare them.
- 1 · Fault detectedE3
High voltage now
After the applicable trip delay, output is off. This example starts with an actual high-voltage shutdown.
Voltage returns to range ↓ - 2 · Recovery waitE0PE3
Current condition normal; earlier fault recorded
Output remains off during the portable model’s 136-second reconnect wait, with required conditions met.
Reconnect conditions satisfied ↓ - 3 · Power restoredE0PE3
History is not a new high-voltage fault
PE3 can remain after output resumes. Read the current E code and output status as well as the history.
Record before resetting, when safe. Removing input power from the EMS clears its PE record; that does not repair the cause. Never delay disconnecting an unsafe supply just to preserve a code.
Source: Progressive’s PT30X/PT50X manual, display example and previous-error instructions. E0 is not an inspection certificate for the whole RV. Other brands and hardwired models can use different codes or delays.
Read history before a reset when safe. Note the time, supply in use and loads that were running. A retained PE code is useful evidence, but it is not a complete event log or proof of the fault’s location.
Surge Guard 34930/34950 LCD messages
Southwire’s instruction sheet lists the following messages. Line 2 and the high-neutral-current trip apply to the 34950, not the 30A model.
| Message | Interpretation |
|---|---|
| REPLACE SURGE | Surge protection is depleted; arrange replacement. |
| OPEN GROUND | Grounding connection fault. |
| REVERSE POLARITY | Miswiring or an abnormal ground condition; stop using the connection. |
| L1 HIGH / L2 HIGH | Above 136V. |
| L1 LOW / L2 LOW | Below 102V. |
| OPEN NEUTRAL | The sheet identifies a coach-side neutral fault. |
| NEUTRIP | Neutral current above 130% on the 50A model; needs diagnosis. |
| L1 AMPS | Line current above 110% of the rating. |
| RECEPT OVERHEAT | Plug/receptacle overheating. |
| GND HIGH | Abnormal voltage on ground. |
The RV ON/OFF display distinguishes output status from a warning. The sheet says reverse-polarity/ground conditions prevent power on the 50A model only; do not assume the 34930 disconnects for every warning. Voltage recovery has a separate 128-second wait. A message containing WAS includes a recorded value; read the current screens too.
Hughes Power Watchdog indicators
Codes are brand-specific. Hughes’ FAQ identifies a red logo with E9 as a depleted surge module on Gen I EPO and Gen II models. E9 itself does not cut power. Gen I base PWD30/PWD50 use the lower surge-status lights instead. Follow the exact model’s module procedure.
Other active faults can appear on the unit as well as in the app. A failed phone connection is not an electrical diagnosis. Gen II Wi-Fi setup starts with Bluetooth and requires a compatible 2.4GHz network; Hughes says most combined 2.4/5GHz networks work too. See the manufacturer setup guide and Watchdog review.
Is it the protector, the supply or the RV?
A check on a verified alternative supply can help narrow a fault after damaged connections and unresolved RV-side hazards have been excluded. It does not settle every diagnosis: supply conditions can change, and a fault that follows you may involve the cord, adapter, RV or protector.
Use the exact manufacturer procedure and involve campground maintenance or a qualified electrician for wiring faults. Record any current and previous codes for support. Do not open or probe an energised pedestal.
Which conditions mean stop
Open ground, open neutral, reverse polarity, abnormal ground voltage and overheating require attention before using the affected connection. They are not corrected by clearing a history record. A depleted surge module also needs prompt service even if other functions still pass power.
If the supply appears normal but an RV breaker trips, follow the breaker troubleshooting guide. A normal EMS code does not rule out every downstream fault.
Related guides
- EMS vs surge protector — why a basic surge protector shows you none of this.
- Best RV surge protectors — eight units compared, including which ones report faults in plain English.
- Progressive vs Power Watchdog — local readings, app access and protection features compared.
- Hughes Power Watchdog review — including app selection and Wi-Fi setup requirements.
- Progressive EMS-PT30X review — including the separate trip and 136-second reconnect timers.
- Surge Guard vs Progressive — plain English messages against numbered codes, and which brand cuts power sooner.
- Why does my RV breaker keep tripping? — when the problem is load rather than the pedestal.
- 30 amp vs 50 amp RV — why 50 amp units have Line 2 codes and 30 amp units do not.
Questions worth answering
Does an error code mean the protector is broken?
Not necessarily. It may report a supply fault, an RV-side condition, depleted surge protection or an internal communication problem. Identify the exact model, current code and output status before diagnosing it.
What is the difference between E and PE on a Progressive EMS?
E describes the current condition. PE records a previous shutdown fault and can remain after normal power returns. Removing power from the EMS clears the PE record; it does not fix the underlying cause.
Can an adapter fix E2 open ground?
Do not use an adapter to defeat a ground warning. Stop using the suspect connection and have the supply and connection path checked. Generator grounding arrangements need the exact equipment instructions.
Can REPLACE SURGE appear while power still works?
Yes. Southwire’s 34930/34950 instructions say other functions continue after surge protection fails, but recommend replacing the unit. Arrange service or replacement promptly; continuing power does not mean surge protection remains available.
Why does a normal code appear before power returns?
The reconnect delay is separate from detecting the fault. Progressive PT30X/PT50X portables wait 136 seconds; Surge Guard 34930/34950 wait 128 seconds after the applicable conditions clear. Other models can differ.
Should I bypass the EMS to clear a fault?
Do not bypass a reported hazardous supply to restore power. Have the fault checked. A history reset and an electrical repair are different actions.