E19
Tesy
External Control Input Error
Tesy heater shows E19; unit may not detect external control signal (e.g., tariff control, smart grid input).
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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
Open circuit on external control terminals, incorrect wiring of tariff contact, failed optocoupler or input circuit on control board, configuration not matching wiring
How to Fix / Troubleshooting
Safety first: Turn off power and, if working on external control circuits, ensure all related circuits are de-energized.
Steps:
- Check external wiring: Inspect the wiring to the external control terminals (e.g., night tariff contact). Ensure connections are tight and correctly placed as per the wiring diagram.
- Bypass test (qualified person only): Temporarily bridge the external control terminals (if allowed by the manual) to simulate a closed contact and see if E19 clears.
- Verify configuration: Ensure the heater is configured to use or ignore external control according to your installation. Misconfiguration can cause E19.
- Replace control board: If wiring is correct and E19 persists, the external input circuit on the control board may be defective; replace the board.
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Repair Difficulty
Medium
3/5
Required Part
Electronic Control Board
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