E11
Pennco
Return Temperature Sensor Fault
Boiler shows E11 and cycles off quickly after starting
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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 return water temperature sensor, Loose sensor wiring, Sensor not properly inserted into well, Defective control board input
How to Fix / Troubleshooting
Safety first: Turn off power and allow boiler to cool before touching sensors or wells.
- Locate sensor: Find the return temperature sensor on the return piping or in a sensor well on the boiler. It is typically a small probe with two wires.
- Check connections: Ensure the sensor wires are firmly connected to the control board terminals and not damaged.
- Inspect sensor placement: Confirm the sensor is fully inserted into the well and secured with a clip or set screw.
- Resistance check (advanced): With power off, measure sensor resistance with a multimeter and compare to Pennco temperature/resistance chart. Replace if readings are out of range.
- If wiring and sensor are good: The control board input may be faulty and require replacement.
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Repair Difficulty
Hard
4/5
Required Part
Return Temperature Sensor
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