E20
CTC
Condensate / Leak Detection Fault
Display shows E20 and unit will not start; often after a leak or condensation event
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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
Water detected in base pan, Tripped leak sensor, Blocked condensate drain (condensing models), Faulty leak detection sensor
How to Fix / Troubleshooting
Safety first: Turn off power and gas. Water and electricity are a dangerous combination.
Steps to check:
- Remove the lower front panel and inspect the base of the CTC water heater for standing water.
- Locate the leak detection sensor or float switch in the base pan. Dry the area thoroughly with towels.
- Clear any blockage in the condensate drain line and trap (for condensing gas models). Flush with water to ensure free flow.
- Inspect for active leaks from fittings, the heat exchanger, or the tank. Repair or replace leaking components.
- Once the area is dry and leaks are corrected, restore power. If E20 persists, replace the leak detection sensor.
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Repair Difficulty
Hard
4/5
Required Part
Leak Detection Sensor
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