The algorithm in Figure 1 is designed to check if a laboratory incubator's temperature is valid (at least $37.0^{\circ }C$) and calculate the buffer temperature above the room's temperature. It contains a logic error on line 11.

Figure 1

1  validReading ← False
2  REPEAT
3      buffer ← 0
4      OUTPUT 'Enter room temperature: '
5      roomTemp ← USERINPUT
6      OUTPUT 'Enter incubator temperature: '
7      incubatorTemp ← USERINPUT
8      IF roomTemp ≥ incubatorTemp THEN
9          OUTPUT 'Room temperature must be less than incubator temperature'
10     ELSE
11         IF incubatorTemp ≥ 37.0 THEN
12             OUTPUT 'Incubator temperature must be at least 37.0 degrees'
13         ELSE
14             validReading ← True
15         ENDIF
16     ENDIF
17 UNTIL validReading = True
18 buffer ← incubatorTemp - roomTemp
19 OUTPUT buffer