E13
Pennco
Outdoor Reset Sensor Fault
Boiler shows E13 and may lock out during operation
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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
Open or shorted outdoor temperature sensor, Damaged sensor cable, Incorrect sensor location (direct sun or heat source), Faulty control board sensor input
How to Fix / Troubleshooting
Safety first: Turn off power before working on wiring.
- Locate outdoor sensor: Find the Pennco outdoor reset sensor mounted on an exterior wall, typically on the north or shaded side.
- Inspect cable: Check the low-voltage cable from the sensor back to the boiler for cuts, staples through the wire, or UV damage.
- Check mounting: Ensure the sensor is not in direct sunlight or near dryer vents or other heat sources.
- Test sensor: Measure resistance at the boiler terminals and compare to the outdoor temperature/resistance chart. Replace the sensor if out of range.
- If E13 remains: The outdoor reset input on the control board may be defective and require replacement.
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Repair Difficulty
Medium
3/5
Required Part
Outdoor Temperature Sensor
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