Samsung AQ09VFUAGM/CV Service Manual page 64

New Function [ Indoor Terminal Block Safety Device ]
1.Thermal Fuse is installed in Terminal Block as below.
(Thermal Fuse is used to prevent PL caused by a defective connection of indoor and
outdoor units)
2. Thermal Fuse is opened when internal temperature of Terminal Block goes to a certain point
due to Tracking caused by a defective connection of indoor and outdoor units.
- When Thermal Fuse is opened, Main PBA (DC12V) is turned off and the indoor unit does
not operate. (There is no problem with Main PBA in this case)
- In the above case, the change of all-in-one Terminal Block will make Main PBA operate again.
3. Measurement method of fair/defective thermal fuse