Common Power Products Misconceptions & Issues

Over our 40 years serving the RV industry’s electrical needs, we have noticed a few common misconceptions about power products. Additionally, our Power Pros have compiled a list of common problems and solutions that our customers have encountered with converters, inverters, and transfer switches. Our goal is to always help our customers any way we can to minimize the potential for problems down the road. Most are fairly simple solutions that, if implemented, can prevent warranty claims and other complications in the future.

The Truths Behind Common Power Product Misconceptions:

  • Batteries are not required for WFCO converters to function.
  • WFCO converters are not built to withstand high voltage situations like plugging into the wrong power source, lightning strikes, or power surges. Surge protectors are recommended for protection.
  • Converters have no effect on 110VAC appliances or outlets. If your outlets are INOP, the converter is not the problem. Further diagnostic tests are required to find the source.
  • WFCO converters convert VAC to VDC only not VDC 12V to VAC 100V.
  • With any converter, the potential to trip GFCI protected poles exists.

Converter Problems & Solutions:

PROBLEM: RED LED WARNING LIGHT IS ALWAYS ON AND FUSE IS GOOD.

SOLUTION: Ensure affected circuit wire is not touching metal or another branch circuit.

PROBLEM: RED LED WARNING LIGHT WILL NOT COME ON AND FUSE IS BAD.

SOLUTION: Ensure the load on the circuit is present. For example, circuit #4 bathroom lights: ensure light switch is in the on position to simulate the load being present. If switch is in the off position, the load is not present, and the LED will not light up.

PROBLEM: CONVERTER NOT CHARGING BATTERY, BUT ALL 12V APPLIANCES ARE OPERATIONAL.

SOLUTION: 8700 Series: Check #4 fuse on WF-8712/25 or #6 fuse on WF-8735/40 (this is your battery positive).

PROBLEM: Converter trips Shore Power GFCI.

SOLUTION: Reset GFCI and plug Shore Cord back into GFCI. When plugging into a GFCI with a completely discharged converter, the possibility does exist to trip GFCI.

PROBLEM: Fan constantly runs with nothing on in the camper.

SOLUTION: Pull Reverse Polarity Fuses. The fan should stop, meaning there is a load on the converter therefore making the cooling fan run. If the fan does not stop, this is an indication of a failure.

PROBLEM: Noticeable flickering of interior lights or Converter Cooling Fan acting erratically.

SOLUTION: Disconnect battery from Converter. This can be an indication of a dead or shorted cell in the 12V battery.

PROBLEM: Converter keeps shutting down.

SOLUTION: Ensure proper ventilation and check for obstructions regarding the cooling fan. WFCO converters are over temperature protected and will shut down.

FACT: Voltage will be present on both sides of the DC fuse terminals due to the LED circuit.

Inverter Problems & Solutions:

PROBLEM: INVERTER KEEPS SHUTTING OFF WHILE TOWING CAMPER DOWN THE ROAD.

SOLUTION: Check voltage of alternator of towing vehicle. Inverter will shut down at 15VDC.

PROBLEM: INVERTER SHOWS ERROR CODE E-04.

SOLUTION: Check battery for low-voltage or dead cell. Inverter will shut down around 10VDC. Battery voltage will be higher before the inverter is turned on. Watch battery voltage when inverter is turned on with a load.

PROBLEM: INVERTER LCD SCREEN INDICATING PROPER OUTPUT VOLTAGE, BUT VOLTAGE IS LOW AT THE OUTPUT WIRES.

SOLUTION: Call WFCO Tech Support for authorization to open WF-5110 to fix. Wire pulled off board of inverter during the installation process.

Transfer Switch Problems & Solutions:

PROBLEM: WILL NOT PASS THROUGH ON SHORE POWER.

SOLUTION: T-30 check VAC coming into shore pigtails to verify voltage to the transfer switch. Also check for good connections to the transfer switch.

PROBLEM: WILL NOT TRANSFER FROM GENERATOR TO PANEL.

SOLUTION: Ensure proper voltage from generator to transfer switch. If proper voltage is getting to transfer switch, cut all power off, verify no voltage inside the transfer switch and check for debris in the relays of the transfer switch.

FACT: Transfer switch will only pass-through what is wired in. Transfer switch cannot generate high voltage or spikes.