Hayward OmniLogic Relay Or Output Not Activating: HVR And LVR Diagnostics

OmniLogic Relay Architecture

The HLBASE includes four on-board high-voltage relays (HVR1–HVR4). The optional HLRELAYBANK adds four more (HVR5–HVR8). Two HLRELAY single-relay kits can fill positions HVR9 and HVR10 for a maximum of 10 high-voltage relay positions. All HVR relays switch both legs of a 240 V load (double-pole), and all are rated for pool equipment at 3HP/30A (240 V) or 1.5HP/30A (120 V).

Low-voltage relay outputs (LVR1–LVR8) are dry-contact closures for heaters and other low-voltage controlled equipment. The OmniLogic does not supply voltage through LVR outputs — it simply opens or closes the contact.

Step-By-Step Troubleshooting

Step 1: Confirm the relay number and configuration assignment

1. Open the enclosure door and locate the Connection Table. Confirm the relay number (HVR1–HVR10 or LVR1–LVR8) that is assigned to the affected equipment.
2. In the OmniLogic Config Wizard, verify the equipment is assigned to the correct relay position. If the connection table was never filled out and the wizard assignment is unknown, check each relay in Quick Edit mode.
3. For HLRELAYBANK or HLRELAY add-on relays: confirm the OmniLogic detected the hardware at startup (it will appear in the device table in the Config Wizard). If not detected, the relay bank may not be properly connected to the main board — refer to the HLRELAYBANK installation manual for the required wire connection at the main board.

Step 2: Command the relay on and listen for the click

On the OmniLogic touchscreen, navigate to the equipment assigned to the relay and command it ON. Listen for the distinct audible click of the relay closing inside the enclosure.

• If you hear the click: The relay is energizing. Proceed to Step 3 to check voltage on the load side and the circuit breaker downstream.
• If you hear no click: Either the relay coil has failed, the relay is not receiving the command due to an interlock or configuration issue, or the main board is not sending the energize signal. Proceed to Step 4.

Step 3: Measure voltage on the relay load terminals

Tech-level, with power on and PPE:

1. With the output commanded ON, measure voltage across the load-side terminals of the relay for the affected circuit.
2. A 240 V load should show approximately 240 VAC between both load terminals when the relay is closed.
3. A 120 V load should show approximately 120 VAC between the hot load terminal and neutral.
4. If you measured voltage on the line side of the relay (breaker side) but no voltage on the load side with the relay commanded ON, the relay contacts have failed. Replace the relay.
5. If no voltage exists on the line side, the circuit breaker for that relay's supply is open or missing — check and reset the breaker in the OmniLogic subpanel.

Step 4: Check interlock settings

Interlocks are the most commonly overlooked reason a relay refuses to activate. An interlocked output will only close when the filter pump is on AND the system is in the correct body-of-water mode (pool, not spa).

• In the Config Wizard, navigate to the equipment and check whether "Interlock" is enabled.
• Temporarily disable the interlock and test the relay. If it activates, the interlock was preventing operation — confirm the filter pump and body-of-water state requirements before re-enabling.
• For water features and pressure-side cleaner boost pumps, interlocking is intentional and should remain enabled per the installation manual guidance.

Step 5: Test for relay coil failure

Tech-level, with power off:

1. Disconnect the relay from the circuit.
2. Using a multimeter in resistance mode, measure the relay coil resistance. A functioning relay coil will show a finite resistance (typically 150–500 ohms for a 24 VDC relay coil). An open coil will read OL (infinite resistance).
3. If the coil reads open, the relay is defective and must be replaced with a Hayward genuine replacement part. Contact your Hayward distributor with the relay position (HVR1–HVR10) and the OmniLogic model number (HLBASE).

Step 6: For GFCB-protected lighting circuits

Pool lights must be supplied through a ground fault circuit breaker (GFCB) in the OmniLogic subpanel. If the GFCB has tripped, the relay will click (and show voltage at the line side) but no voltage will reach the light fixtures.

• With the output commanded OFF, reset the GFCB.
• Command the light output ON and observe whether the GFCB trips immediately. If it does, there is a ground fault in the lighting circuit — isolate the fault before resetting again.