If the heating does not work even after checking all of the above checks, do as below.

> If the actuator fails, separate the valve body and the actuator for emergency heating.  
> Use a manual valve to turn on/off the heating.  
> Request warranty after emergency heating.  

The boiler heats up even though the set temperature is lowered.

1. Check: Is the actuator and valve loosely assembled?  
> Action: Turn the actuator and valve connection clockwise to secure the loosened connection.  

Even though the thermostat heating indicator mark and the actuator lamp are on, there is no heating.

1. Check: Is there any debris in the pipes?  
> Action: Clean the strainer before using it.  
2. Check: Is there any AIR pocket in the piping?  
> Action: Remove the AIR before using it.  
3. Check: In case of individual heating, is the boiler operating normally?  
> Action: Ask the boiler manufacturer for after self-testing the boiler.  

The thermostat heating indicator is on but no heating.

1. Check: Is the thermostat set temperature lower than the room temperature?  
> Action: Set the set temperature higher than the room temperature.  
2. Check: Is the LED lamp on the actuator at the bottom of the sink on?  
> Action: When the thermostat heating icon is on, make sure that the actuator LED lamp in the room is on at the same time.  
3. Check: Is there a sound of heating water flowing through the distributor pipe at the bottom of the sink?  
> Action: If there is no sound, contact the management office  

The thermostat LCD screen does not come on.

1. Check: Is the power plug not out?  
> Action: Plug in the sink lower motor controller power plug.  
2. Checked: Is the thermostat engaged in good?  
> Action: If it is not closely attached to the wall, request an aftersales service.