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10) Temperature cutoff protection- Wired controller shows 0D
confirm the malfunction
according to the fault code list
yes
yes
no
yes
no
yes
no
yes
no
yes
no
Replace sensor
yes
Replace indoor PCB
Are indoor sensors for
ambient temperature and
coil properly located?
Is resistance of indoor
sensor correct?
Does four-way
valve work
properly?
Relocate
Replace four-way
valve
Is outdoor four-way valve
in good condition during
heating cycle?
Does small relay coil
of four-way valve have
a voltage of 12V DC?
no
Relay is broken.
Replace PCB
Is indoor unit
malfunction caused by
lack of refrigerant?
charge refrigerant
Is heat exchange effect
adversely affected by heavy dust
in indoor and outdoor units?
cleaning
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