Pentair IntelliTouch Relay Board Problems
The IntelliTouch load center contains high-voltage relay circuits that switch power to pumps, lights, heaters, and other equipment. Relay failures are among the most common hardware faults on IntelliTouch systems. This guide covers identifying relay failures, how the relay system is organized by model, electrical testing steps, and what to do when a relay circuit fails.
High-Voltage Hazard
The IntelliTouch relay circuits switch 120V and 240V loads. Turn off the main breaker to the load center and verify absence of voltage with a multimeter at all relay terminals before opening the enclosure or touching any board component. This is not a task to perform with the system energized.
IntelliTouch Models, Load Centers, and Relay Counts
IntelliTouch uses a Personality Kit system. The relay count depends on which Personality Kit is installed and whether the system uses a Load Center or Power Center:
- Load Center: 26"H × 17"W × 5¼"D. Includes a built-in sub-panel (150 amps) and 5 × 25-amp three-horsepower relays as standard.
- Power Center: 20"H × 17"W × 5¼"D. Same as Load Center except no circuit breaker base.
| Personality Kit | Part Number | Total Relay Circuits | Notes |
|---|---|---|---|
| i5+3 | 521219 | 5 (Load Center only) | Filter pump + 4 aux; no additional relays in kit |
| i7+3 | 521220 | 7 (5 in LC + 2 in kit) | 2 additional relays included in Personality Kit |
| i9+3 | 521221 | 9 (5 in LC + 4 in kit) | 4 additional relays included in Personality Kit |
| i10+3D | 521222 | 10 (5 in LC + 5 in kit) | Dual equipment system; 5 additional relays in kit |
| i5S+3 | 521223 | 5 (Load Center only) | Single body of water configuration |
| i9+3S | 521224 | 9 (5 in LC + 4 in kit) | Single body of water, larger configuration |
The "+3" in IntelliTouch model names refers to the capability of operating additional equipment through Feature Macro circuits — spillway functionality, valve control, and feature circuits — not to three additional physical relay positions.
Relay connectors on the Personality board are labeled: FLTR PUMP, AUX1, AUX2, AUX3, AUX4, AUX5, AUX6, AUX7, AUX8 at the top edge of the board. IntelliTouch supports up to 40 relay circuits total when expansion centers (i5x, i10x) are added — a maximum of 10 per Load Center, with up to three expansion centers.
Symptoms of Relay Circuit Failure
- Circuit On in panel, load does not run. You activate a circuit on the IntelliTouch indoor or outdoor control panel but the pump, light, or other device stays off. This is the primary symptom of a relay connector that is unseated, or a relay with failed-open contacts.
- Load runs continuously regardless of circuit state. A pump or light that runs even when the circuit is commanded Off indicates relay contacts that are welded closed (failed closed). This is a serious condition.
- One specific circuit fails while others work normally. This pattern strongly suggests a problem with that circuit's relay connector or relay, rather than the Personality board or PCB.
- Intermittent circuit operation. The circuit works sometimes but randomly fails. This indicates a relay connector that is partially unseated, a relay with partially damaged contacts, or a connector pin with intermittent contact.
- Audible chattering from the load center. Rapid clicking indicates either a relay coil that is not fully energizing, or the outdoor control panel toggling the circuit command rapidly.
Visual Inspection
With the load center de-energized and the outdoor control panel folded down to expose the Personality board, inspect the relay connectors:
- Check that all relay connectors at the top edge of the Personality board are fully seated. Each connector is labeled (FLTR PUMP, AUX1, AUX2, etc.). A connector that is partially unseated will prevent that relay from operating.
- Look for any relay with discoloration, cracked housing, or burn marks on or around its base. Heat damage from overloaded relay contacts is often visible.
- Inspect the PCB traces on the Personality board around each relay connector for burn marks, lifted traces, or corrosion.
- Look for evidence of water intrusion — rust stains, white mineral deposits, or condensation marks — particularly at the bottom of the enclosure and around conduit entries.
Testing the Relay Circuits from the Outdoor Control Panel
IntelliTouch provides a way to test relay circuits directly from the Outdoor Control Panel in Service mode:
- Press the System Control button on the Outdoor Control Panel until the SERVICE LED is lit.
- Press the F (Filter Pump) button to activate the filter pump relay. Verify the pump turns on.
- Press AUX 1 through AUX 8 buttons in sequence, verifying each piece of equipment turns on and off when commanded.
- Label the circuit buttons on the Outdoor Control Panel with the equipment each relay controls.
Note: When IntelliTouch is in Service mode, IntelliFlo pumps will stop responding to speed commands from RS-485 and run at their default speed or stop. This is normal behavior, not a relay failure.
Voltage Testing at Relay Output Terminals
Test 1: Output voltage (contact closure)
With the system powered and a circuit commanded On from the Outdoor Control Panel in Service mode, measure AC voltage at the relay output terminals for that circuit (the screw terminals where the load wires connect). You should read line voltage (120V or 240V). If no voltage is present at the output terminals when the circuit is On, the relay contacts are not closing — check that the relay connector is fully seated on the Personality board.
Test 2: Stuck-closed relay
With the circuit commanded Off, verify 0V at the relay output terminals. Voltage present with the circuit off means the relay contacts are welded closed — the relay must be replaced.
Relay Connector Service
- Turn off the main breaker feeding the load center. Use a multimeter to verify no voltage is present at the relay output terminals.
- Photograph all wire connections before removing anything.
- Label each load wire with its circuit name using masking tape and a marker.
- Unplug the relay connector from the labeled output on the Personality board (FLTR PUMP, AUX1, etc.).
- Inspect the connector pins for corrosion or damage. Clean corrosion with contact cleaner if needed.
- Reseat the relay connector firmly onto the Personality board output.
- Restore power and test the affected circuit from the Outdoor Control Panel in Service mode.
For relay replacement, contact Pentair Technical Support at 800-831-7133 with your Personality Kit model number (found on the label inside the Load Center door or on the Personality board) to obtain the correct replacement relay.
When to Suspect the Personality Board Instead of the Relay
If the relay connector is correctly seated and the relay tests as functional, escalate to suspecting the Personality board if:
- Multiple relay positions fail simultaneously with no visible damage to any relay.
- The system behaves erratically across multiple circuits — schedules running at wrong times, circuits toggling randomly, or the display showing incorrect circuit states.
- The indoor control panel shows no power (screen blank, no LEDs, buttons not working). This can indicate bad wiring from the Outdoor Control Panel or Personality board; check the wiring and screw terminal connections. In some cases crossed wiring can cause permanent board damage — contact Technical Support.