50A Hardwire Troubleshooting Guide

Surge Guard protects your RV from low quality or incorrect shore power.
Normally shore power should be around 115 –120 Volts AC from L1 or L2 to Neutral, or 240V from L1 to L2. When power
falls too far outside this range it represents a poor or hazardous condition to your RV’s electrical system. Surge Guard
provides protection to your RV by turning off power when the line voltages L1 or L2 fall below 102 Volts AC or go above
132 Volts AC.
Surge Guard also protects your electrical system from a Reverse Polarity condition which indicates that the Hot and
Neutral lines of shore power are swapped or reversed. This can be hazardous to equipment and safety. Surge Guard will
not connect power to your RV until the Reverse Polarity fault is corrected.
In the event your Surge Guard is not functioning as expected, perform the following troubleshooting steps in order to
determine and correct any malfunctions. Note: Testing should be performed with AC units and electrical appliances turned
off, then veried with appliances turned on.
Connect the shore power cord to a 240V, 50A power source. The Caution When Flashing Light will blink on and off for
at least 128 seconds before power is connected to the RV. This allows the Surge Guard to correctly determine the Line
Voltages before applying them to the RV. If you also have the Optional Remote LCD Display, the screen will display
“DELAY” plus the delay time for 128 seconds while the Surge Guard is monitoring the incoming power and the caution
light is ashing. Note that this guide also applies if using 120V, 30A power with a suitable adapter.
TROUBLESHOOTING GUIDE
Model 35550
50A Hardwire Surge Guard
®
with Optional
Remote LCD Display
For technical assistance, please call 1-800-780-4324 x 20311
TECHNOLOGY RESEARCH, LLC A Southwire Company
5250 140th Avenue North ▪ Clearwater, Florida 33760
505-00117A
LINE
www.SurgeGuard.com
POWER ON
561-01044A
(Green = OK, Red = Fault)
LOAD
CAUTION WHEN FLASHING
(Green = OK, Red = Fault)
LINE 2
LINE 1
REMOTE
PORT
120/240V, 50 Amp
3850 Joules of Power Surge Protection
SURGE (No Protection When Lit)
POWER PROTECTION
Model 35550
MODEL 35550 INDICATOR LIGHT GUIDE
CONDITION
DESCRIPTION
INDICATOR LIGHT STATUS
RV POWER
LINE 1 LINE 2 DELAY/CAUTION
Normal Conditions green green off on
Startup Condition on on ashing off
Reverse Polarity on on ashing off
Open Ground on on ashing off
Voltage on Ground on on ashing off
Over or Under Voltage red red ashing off
No Power at L1 off off off off
PROBLEM TROUBLESHOOTING STEPS
Coach powers up after 128 seconds but then
turns off after another 8-10 seconds.
The Surge Guard may be operating properly, and you may have a low voltage condition. If so,
turn off as many loads as possible. It is not safe to operate some equipment with low voltage.
Verify that the input voltage L1 and L2 are greater than 102VAC with loads turned on and off.
L1 or L2 light turns red. You have an Under or Over Voltage condition on Line 1 or Line 2 coming into the RV. If these
lights are green, yet you do not have power after 128 seconds on the remote display and the
Caution light remains blinking, then you must inspect your shore power for a Reverse Polarity or
Open conductor fault. These faults will also be visible on the Optional Remote Display if used.