E16
Pennco
Condensate Level / Float Switch Fault (Condensing Models)
Boiler display shows E16 and unit may shut down intermittently
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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
Blocked condensate trap, Kinked condensate drain hose, Faulty condensate float switch, Improper condensate pump operation
How to Fix / Troubleshooting
Safety first: Turn off power before working on condensate components. Condensate is mildly acidic; wear gloves and eye protection.
- Locate condensate trap: Find the clear or opaque plastic trap at the bottom of the heat exchanger. Remove and flush it with clean water to remove sludge.
- Check drain line: Ensure the condensate hose is not kinked, frozen, or blocked. Verify it slopes continuously to the drain.
- Inspect float switch: If equipped, check the condensate float switch in the trap or external pump. Make sure it moves freely and is not stuck.
- Test condensate pump: If a pump is used, pour water into the reservoir and confirm it activates and discharges properly.
- If E16 remains: The float switch or its wiring may be faulty and require replacement.
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Repair Difficulty
Medium
3/5
Required Part
Condensate Trap and Float Switch
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