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Section
IV - 5
SM830082
4. Service procedures
(B) Heating
Poor heating
Is setting temp.
suitable ?
Change the setting temp.
Is heating load
too large ?
Review heating load
estimate.
4-way valve is
defective.
Replace the valve.
Refrigerant
shortage
Charge with
refrigerant.
Refrigerant flow
failure
Electronic refrigerant
control valve is defective.
Service valves are not
fully open.
Replace the compressor.Compressor is defective.
Open the valves fully.
Air filter
is clogged.
Clean the filter.
Not enough
air circulation
Is fan speed
set to LOW ?
Set the fan speed to
either MEDIUM or HIGH.
Refrigerant tubes between
indoor and outdoor units
are not insulated.
Insulate wide and narrow
tubes separately.
Replace the valve.
4-way valve is
defective.
Replace the valve.
Cold air is
discharged.
“ STANDBY ” is
displayed.
Cold draft prevention
is not working.
Replace indoor
P.C.B. Ass'y.
Indoor coil sensor E2 is
defective.
Replace the sensor.
b. Heating
0459_M_I