Because Haier water heater have an excellent energy saving function. We design the PCB process like this, it is normal.
Below explain can help you understand its process clearly.
1>For start: after switch on power, display board fully light 1 second, then goes into standby status, only clock display on screen. You can press the power key to start up.
2>For power saving: after setting, If no operation within 2 minutes, it will goes into power saving model, only clock display on screen, you can touch any key to wake up the PCB showing.