Mitsubishi Electric Lossnay LGH-50RVS-E Handbook page 21

No. Problem
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.
19 Abnormal noise
comes from the
damper motor
Factor
The Lossnay unit is operating
in the protective mode (inter-
mittent operation). (Outdoor
temperature is -5°C or lower.)
Mis-assembling of the damper
motor
Damper motor failure
During the intermittent operation, the exhaust fan
operates at fan speed 4.
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.
Damper motor
If no error is found around the pulley and wire,
replace the GM assembly.
─ 21 ─
Corrective action
Pulley