Daikin F-Series Service Manual page 257

Check
(1) Valve body catches at fully opened or half
opened position.
(Symptom)
Cooling:
Heating:
(Discharge air temperatures are different by
room)
(2) Valve body catches at complete close
position.
(Symptom)
Cooling:
room .
makes pump down.
(The low pressure of the unit becomes vacuum)
Heating:
Insufficient gas due to liquid refrigerant
stagnation inside
the faulty indoor unit
(Only for heat pump model)
(3) Valve does not open fully.
(Symptom)
pump model.)
246
Valve Body Condition (Symptom)
Water leakage at the no-operation unit
Flow noise of refrigerant in the no-operation unit
Operation halt due to anti-icing function
The unit does not heat
Refrigerant flow rate vary by unit
Peak cut
The only unit having problem does not cool the
When the only faulty unit is in operation, the unit
IT is activated.
Abnormal discharge pipe temperature
The unit does not heat the room.
OL is activated.
Abnormal discharge pipe temperature
The unit does not cool nor heat (only for heat
OL is actuated.
Abnormal discharge pipe temperature
Check Method / Measure
Reset power supply and conduct cooling
operation unit by unit.
Check the liquid pipe temperature
of no-operation unit.
Is it almost
same as the outside air
temperature?
YES
Replace the EVn of the room.
Reset power supply and conduct cooling
operation unit by unit.
Check the low pressure
Does the
pressure become into
vacuum zone?
YES
Replace the EVn of the room
Check the number of rotation of shaft if it is 5 and
half from full open to complete close using
manual coil for electronic expansion valve. When
the number of rotation of shaft is less than the
above value, the valve may catch anywhere of
the body.
SiBE12-712C
NO
(R7154)
NO
(R7155)
Service Diagnosis