E20
American Water Heaters
Internal Relay or Output Driver Fault
Electronic gas water heater displays E20; unit may not start blower or igniter.
Advertisements
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.
Advertisements
Possible Causes
Failed relay on control board, Burned output driver, Shorted load (blower or igniter) damaging control
How to Fix / Troubleshooting
Safety: Turn off power and gas. Do not attempt to repair the control board at component level.
- 1. Check loads: Disconnect the blower and igniter connectors and test each component for shorts to ground or abnormal resistance. Replace any shorted component.
- 2. Inspect control board: Look for burn marks or melted areas on the control. If present, the board must be replaced.
- 3. Replace control assembly: If E20 is present and loads test good, replace the gas control valve/control board assembly per the service manual.
- 4. Verify operation: After replacement, verify correct sequence of operation (blower start, ignition, flame sense).
Advertisements
Repair Difficulty
Professional Required
5/5
Required Part
Gas Control Valve / Electronic Control Assembly
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements