Question: No display but still heating

Reason：

Because Haier water heater have an excellent energy saving function. We design the PCB process like this, it is normal.

Solution：

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.