E8
Pennco
Internal Control Board Fault / EEPROM Error
Boiler display shows E8 and unit will not start, often after power issues
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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
Power surge or brownout damage, Corrupted control firmware, Loose control board connectors, Moisture intrusion into control compartment
How to Fix / Troubleshooting
Safety first: Turn off power at the service switch before touching the control compartment.
- Power cycle: Turn off power for at least 2 minutes, then restore power and see if the E8 clears.
- Inspect wiring harness: Remove the front panel and visually inspect all multi-pin connectors on the Pennco integrated control board. Reseat each connector firmly.
- Check for moisture: Look for signs of water leaks above the control (from relief valve, piping, or vent). Dry any moisture and correct the leak source.
- Surge protection: If the error occurred after a storm or outage, consider installing a surge protector on the boiler circuit.
- If E8 persists: The control board is likely damaged and must be replaced with the correct Pennco replacement part by a qualified technician.
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Repair Difficulty
Hard
4/5
Required Part
Boiler Integrated Control Board
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