Daikin REYQ-AATJA, Service Manual

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Troubleshooting by Error Code SiUS372201EA
401 Part 6 Service Diagnosis
Unified Cool/Heat
selection
Cool/Heat
selection for the
external control adaptor
for o
u tdoor u nit is set to
“Unified Master”.
Cool/Heat
selection for the
external control adaptor
for o u tdoor u nit is set
to “Unified S ub ”.
Is the
normal
operation monitor
LED on the o u tdoor u nit
main PCB
b linking?
Is po w er s u pplied to
the o u tdoor u nit?
Is the po w er
s u pply ca b le of the
external control adaptor for
o u tdoor u nit connected to
the 16 V DC po w er
s u pply line?
Is the
normal
operation monitor
LED on the external control
adaptor for o u tdoor
u nit b linking?
Does the
error rec u r w hen
setting Cool/Heat
selection for the external
control adaptor for
o u tdoor u nit to
“I N D”?
N O
N O
N O
N O
N O N O
N O
N O
YES
YES
YES
YES
YES
YES
YES
YES
Replace the o u tdoor u nit
main PCB (A1P).
Replace the external
control adaptor for
o
u tdoor u nit main PCB.
Connect the po w er
s u pply ca b le of the
external control adaptor
for o
u tdoor u nit to the 16
V DC po w er s u pply line.
Replace the o u tdoor u nit
main PCB (A1P).
S u pply po w er to the
o u tdoor u nit.
Replace the o u tdoor u nit
main PCB (A1P).
Unified Cool/Heat
addresses for o
u tdoor
u nits in the
o u tdoor-o u tdoor
transmission are
d
u plicated. Make
address setting again.
Set Cool/Heat selection
for the external control
adaptor for o
u tdoor u nit
to “I N D.”
Diagnosis Flo w chart-2
(Transmission error w hen the external
control adaptor for o u tdoor u nit is mo u nted)
Error code S ub code
U7-02