Service Manual

─ 24 ─
No. Problem Factor Corrective action
18 When the supply
fan is stopped, the
exhaust fan oper-
ates at the higher
fan speed than
the fan speed set
with the remote
controller.
The Lossnay unit is operating
in the protective mode (inter-
mittent operation). (Outdoor
temperature is 23°F (-5°C) or
lower.)
During the intermittent operation, the exhaust fan
operates at fan speed 4.
19 Abnormal noise
comes from the
damper motor
Mis-assembling of the damper
motor
Remove the GM assembly from the main unit, and
then remove the damper motor from the damper
motor casing to check the pulley position. If the
position is incorrect, adjust it as shown in the pic-
ture below, and then reassemble the GM assembly.
PulleyDamper motor
Damper motor failure If no error is found around the pulley and wire,
replace the GM assembly.