CTC Keypad / Interface Failure

CTC water heater display works but buttons are unresponsive or intermittent

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.

Possible Causes

Worn membrane switches, Moisture behind control panel, Loose ribbon cable, Damaged user interface PCB

Safety first: Disconnect power before removing the control panel.

Steps to check:

Remove the front control panel and inspect for moisture or corrosion; dry thoroughly if damp.
Reseat the keypad ribbon cable at both ends.
If only certain buttons fail, replace the user interface PCB / keypad assembly.
If all buttons fail but display is normal, the main control PCB may not be reading the keypad and may require replacement.

Medium 3/5

Keypad / User Interface PCB

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