Err 20
Burnham
Internal Configuration or Parameter Fault
Boiler display shows “Err 20” and unit will not start, often after configuration changes
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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
Corrupted control settings, Incompatible firmware, Incorrect installer setup, Control board memory failure
How to Fix / Troubleshooting
Safety first: Turn off power before accessing the control panel.
- Restore factory defaults (if allowed): Using the installer menu on the Burnham control, follow the manual to reset parameters to factory defaults. Record existing settings first.
- Re-enter system parameters: Carefully reprogram boiler type, input size, system design temperatures, and sensor configuration per the installation manual.
- Power cycle: Turn power off for 30 seconds, then back on to allow the control to reboot.
- Firmware update: If the boiler supports firmware updates, consult Burnham documentation or a technician to update to the latest version.
- Replace control if needed: If Err 20 persists after reset and reprogramming, the control board memory may be defective and require replacement.
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Repair Difficulty
Hard
4/5
Required Part
Boiler Control Board
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