─ 22 ─
3 Remove all lead wires connected to the circuit board.
4 Take the circuit board out.
1 Unscrew the screws (seven PTT screws 5 × 10,
indicated by ) to remove the humidifier (H. elem.)
cover.
2 Remove the H. elem. cover (inside).
Circuit board
H. elem. cover
H. elem. cover (inside)
Assembly precaution
After replacing the circuit board, switches (SW4 and
SW5, indicated by ) must be set to "HIGH".
Otherwise, the unit will not work.
(
5
)
Humidifier Section
Note: GUF-50/100RD4 types are not equipped with the humidifier elements, hose bands, and tubes.
Note: The compatible circuit board, which is equipped
with switches (SW4 and SW5), is used as a ser-
vice part.
SW4
SW5
"HIGH"
"HIGH"
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