TROUBLESHOOTING GUIDE
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
1. Low Voltage – If the input voltage drops below 102VAC for more than 8 seconds, the power will be removed protecting your electronics. This condition may
be caused by overloading the park’s power grid. Try reducing your loads. Otherwise, do not operate until power is restored to safe levels.
2. High Voltage – If the input voltage increases above 132VAC for more than 8 seconds, power will be removed. In Generator mode, check for load balance.
Have the generator's voltage regulator checked by a qualied RV technician.
3. Reverse Polarity – The Caution When Flashing light will be ashing. This indicates that shore power’s hot line and ground are reversed. It can also mean
you have an open conductor on any of the shore power lines. For instance you could have Line 1, Line 2, or Neutral open. Check all input wiring to the Surge
Guard. Check the shore power cord and wiring from the generator if applicable. Check/replace adapter if reducing down to 120V, 20A service. Notify park for
shore power problems if applicable. Also, this can mean a faulty ground condition.
4. Caution When Flashing Light – – Anytime the caution light is ashing, there is some kind of fault present: Reverse Polarity, high voltage on the ground
or neutral wires, or L1 or L2 or both are outside their operating ranges. It is not uncommon for 2 to 3 volts to be on the neutral wire with respect to ground.
Anything higher than this will make this light ash
Model 35550 Troubleshooting (Continued)
Notes:
PROBLEM TROUBLESHOOTING STEPS
Coach does not power up after 128 seconds
after connecting to shore power.
Check the Caution When Flashing light (Red LED). If this light is blinking on and off, you could
have a fault condition on your AC shore power which means the voltage for Line 1 or Line 2 is
either too low (under 102V), too high (over 132V), or that you have a Reverse Polarity condition
(ground and hot lines coming into the RV are reversed, or an open conductor). If you are using
the Optional Remote Display, you can also view these faults on the LCD screen.
Caution When Flashing light is red and
blinking.
This is normal when you rst connect the Surge Guard to shore power. It will ash on and off
for 2 minutes when you rst power it up. Then, if shore power is good, it will stop ashing and
connect power to your RV. If the Surge Guard has been in use for a while and it starts blinking
after power has been good, then a fault has occurred with your shore power. This indicates that
you have an Under Voltage, an Over Voltage, a Reverse Polarity fault or a Faulty Ground. In this
case please notify your park of the condition in order to correct the fault.
A fault occurs such as a low or a high voltage
during normal operation when shore power is
within good operating range
Surge Guard will turn off power to the RV, and the Caution When Flashing light will start blinking.
Also the Line 1 and/or Line 2 light will turn red if you have an Under Voltage or Over Voltage
fault. These faults will also be visible on the Optional Remote Display if used. If the power
returns to normal, the Caution Light will start blinking or the Remote Display will show “DELAY”
on the LCD screen and will wait 128 seconds before turning power to the RV back on.
Optional Remote Display shows a fault (such
as L1 or L2 Low or L1 or L2 High) and the
Caution When Flashing light is blinking.
Any faults detected by the Surge Guard are reected in the Optional Remote Display. This allows
you to view the status or condition of your electrical power from a remote or convenient location.
If the Optional Remote Display shows a fault, as above, check the input connections, shore
power cord, and adapter (if applicable), and notify your park of the condition in order to correct
the fault.
Optional Remote Display shows “REVERSE
POLARITY” and the Caution When Flashing
light is blinking
In this case you have an unsafe condition such as: Shore power connections are reversed, or
there is a faulty ground. In this case please notify your park of the condition in order to correct
the fault. Check voltage on L1 and L2. Voltage should be 240V across.
Optional Remote Display shows "NEUTRIP" This indicates current on neutral return over 65A.
L1 and L2 are within range (102 – 132VAC)
and there is no power.
Please call TRC Technical Support at 1-800-780-4324
Surge Failure Light is on. If the red “SURGE” indicator LED is on, it means that the built-in surge protection has been
sacriced to protect your equipment and is no longer functioning properly. Other features will still
function, but the unit is recommended to be replaced.
L1 and L2 is on, and DELAY/CAUTION light is
ashing
Check to make sure the unit is properly grounded. The green wire going to the terminal block
should be properly attached (see installation manual). The other end of the green wire should
be properly grounded to the RV. If there is a voltage difference between the incoming neutral
(white) and the ground (green) the unit will not allow power to pass through it. If all connections
are correct then there is a bad ground at the pedestal or connection.
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