Boiler display shows E05; outlet temperature sensor fault on some digital Raypak boilers.

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.

Possible Causes

Damaged outlet sensor, Broken sensor wiring, Sensor not seated in well, Control board fault

How to Fix / Troubleshooting

As with A21, inspect and reseat the outlet temperature sensor and wiring. Compare displayed temperature to actual pipe temperature. Replace the sensor if readings are inaccurate or E05 persists.

Repair Difficulty

Medium 3/5

Required Part

Outlet Temperature Sensor

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