Multi F Four-Way Ceiling Cassette Service Manual

Part 5. Trouble Shooting
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Only for training and service purposes
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Display
code
Title Cause of error Check point & Normal condition
35 Low Presser Error
Excessive decrease of low
pressure
• Defective low pressure sensor
• Defective outdoor/indoor unit fan
• Refrigerant shortage/leakage
• Deformation because of damage of refrigerant pipe
• Defective indoor / outdoor unit EEV
• Covering / clogging (outdoor unit covering during
the cooling mode / indoor unit filter clogging dur-
ing heating mode)
• SVC valve clogging
• Defective outdoor unit PCB
• Defective indoor unit pipe sensor
■ Error diagnosis and countermeasure flow chart
Is service valve
opened?
Open service valve
Are communication cable/
piping normal?
Yes
No
Is amount of refrigerant
normal?
[refer refrigerant part]
Yes
No
Is fan normal?
(in heating outdoor fan,
in cooling indoor fan)
Yes
Adjust the amount of
refrigerant (Additive charge)
check communication/
piping correction.
Check and replace related parts
(error 105~108 reference)
Is strainer Ok?*
No
Replace the strainer
No
Replace the pressure sensor
Yes
Yes
Check indoor / outdoor unit LEV
Check Indoor unit PCB
Check indoor / outdoor unit
installation conditions
Yes
Are the values of manifold
and low pressure sensor same?
( Is the low pressure value
actually low?)
No
Is there pipe crack or trace
of refrigerant leakage?
Weld / reconnect the cracked
portion and recharge refrigerant
No
Yes
* If the temperature difference between inlet and outlet of strainer
is so large that frost or ice formation can be seen or confirmed
then clogging of strainer should be checked
(Notice: it is not full ice forming of strainer, in case that there is
not at inlet portion but at outlet portion)