Mitsubishi Electric Lossnay VL-250CZPVU-L-E Handbook page 39

No. Symptom
2 Water leaks from the
duct pipe.
Failure mode 7 Individual troubleshooting
[1] Diagnosis of the damper
No. Symptom
1 Damper motor failure
2 Damper adhesion
Cause
The pipe guide and duct is not caulked
with silicone with no gap.
Condensation occurs around the pipe
guide or in the pipe guide.
The gradient of the duct pipe is not cor-
rect. (It should be tilted upward for 1/30
or more from outdoors to indoors to pre-
vent rain drops, snow, or mist from enter-
ing the unit.)
Rain drops, snow, or mist enters the unit. • Stop the product temporarily in case of
Diagnosis method
Disassemble the product to see the
damper (assembly). (Refer to "10.
Overhauling procedures".)
Check if the damper operates in the
trial operation mode.
(Refer to "6.7 Trial operation" in the
Installation Manual for details of the
trial operation mode.)
Disassemble the product to see the
damper (assembly). (Refer to "10.
Overhauling procedures".)
Open and close the damper plate man-
ually and check if a foreign substance
is adhered to the damper plate and/or
the damper plate is adhered.
If there is a gap, caulk it using silicone.
(Refer to the Installation Manual for the
procedure.)
Use commercial heat insulation materials
to insulate the duct.
(Refer to the Installation Manual for the
insulation procedure.)
Connect the duct correctly.
a hard rain, snow, or dense mist.
• Use an outdoor hood which prevents
rain drops or snow from entering the
unit.
If the damper does not operate, replace
the damper (assembly).
Remove the foreign substance or cause
of adhesion.
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Corrective action
Corrective action