Boiler shows E19; may indicate internal clock or timer fault on models with integrated programmer.

Safety first: Isolate power before removing covers.

• Reset clock settings: Using the user interface, attempt to reset the time and programme settings. Observe whether they are retained after a power cycle.
• Check backup battery (if fitted): Some control boards use a small battery or supercapacitor to maintain clock settings. If accessible and replaceable, fit a new one of the same type.
• Firmware update (if supported): Consult Elnur technical documentation to see if a firmware update is available to correct known clock issues.
• Replace PCB: If the clock cannot be set or loses time rapidly, the PCB may need replacement.