Short Answer: This message generally means that the SuperSting™ transmitter is unable to output current—usually due to an open circuit between the A & B transmitting conductors related to menu settings or physical connections.
Check for the following if you're getting an HVOVL error code:
1. Check that the Passive Cable Connections are Correct:
HVOVL errors can occur if passive cables are split incorrectly between the low and high address of the SwitchBox. Check the Passive Connection Guide to make sure your SwitchBox 28, 56, 84, or 112 is connected correctly.
2. Double-check that the Command File, Cable Address Table and SwitchBox size and programming all match:
Check if the SwitchBox is programmed to the sequence of electrodes you are specifying in your Cable Address Table (Menu 6, then press 2 on the keypad). You may need to reprogram the SwitchBox in Menu 3 if this SwitchBox were used in a multiple SwitchBox setup prior. A quick Relay Test from Menu 3 will confirm the current program addresses of the SwitchBox.
3. Check all of the round black connectors for the single 2m extension cable (used to connect the SuperSting™ and SwitchBox) and its two connectors:
Look for pushed in pins in each connector. Inspect the cable for physical damage. Use an ohm meter (multimeter) and check for continuity of each connector pin.
4. Do a Contact Resistance test to check the Transmitter:
On your SuperSting™ go to Menu 3, then press 1 on the keypad.
If the Contact Resistance option 3 for B-Inf Test is turned to On but you have not installed an infinity wire and electrode, you will receive HVOVL error on all contact resistance values and all Automatic Mode measurements
5. Check the SwitchBox:
Inspect the fuse of the 1 Amp fuse on the SuperSting™ that provides power to the SwitchBox. On SuperSting™ WiFi models, all fuses are mounted on the left side of the faceplate near the power switch. Older systems have the 1 Amp fuse internal mounted inline. Please troubleshoot other items before checking this internal fuse and contact AGI for instructions on checking the internal fuse. A relay test (Menu 3) will confirm if the Switchbox is receiving power and the programming of the SwitchBox matches the relay low and high address you have tested
6. Check the electrodes cable:
Check if the electrode takeout is disconnected from the stainless steel stake.
Check if the stainless steel stake is disconnected from the earth or poorly planted in the ground.
Look for pushed in pins in each connector.
Inspect the cable for physical damage.
Use an ohm meter (multimeter) and check for continuity of each connector pin.
7. Check the battery:
If using 12V batteries make sure that the voltage is above 12.1 Volts. The SuperSting™ batteries should be swapped out at 11.7V well before the 11.3V low battery warning. Batteries often fluctuate under load and can cause HVOVL due to not providing enough current to operate correctly.
8. Contact Support if the problem persists:
If you've checked all of the components above and are still experiencing issues. Please contact us at firstname.lastname@example.org