Fujitsu AW Z24LBC Series Service Instruction page 76

REPLACEMENT PARTS
Wiring of a piping thermistor lead
E
Don't slack each lead in the heat exchanger cover upper part.
F
Spring
E
Do not touch each lead and the spring.
Remainder of each lead (UV unit, room temperature,
piping thermistor lead) is put in between a heat
exchanger cover and an electrical control unit,
as shown in the above figure.
G - G
F
Transparent tube
Piping thermistor
G G
Piping thermistor
09-13