SEN
Raypak Sensor Circuit Error

Display shows 'SEN' and heater will not operate; may indicate general sensor circuit fault.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Shorted or open sensor wiring, Multiple sensor failures, Control board sensor input failure, Incorrect sensor type installed

How to Fix / Troubleshooting

Safety first: Turn off power before working on wiring.

Steps to address SEN error:

  • Identify all sensors: Water temperature, flue, air, and limit sensors may share common circuits. Inspect each for damage.
  • Check harnesses: Follow the sensor harness from the board to each sensor. Look for pinched, cut, or chewed wires.
  • Disconnect sensors one at a time: With power OFF, disconnect each sensor and check resistance individually. Replace any that are out of specification.
  • Inspect control board: Look for corrosion at sensor input pins. Clean gently if minor; replace board if heavily corroded or burned.

Note: If multiple sensors were replaced with non‑OEM parts, verify compatibility with Raypak specifications.

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Repair Difficulty

Hard 4/5

Required Part

Temperature Control Board
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