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An external alarm is
identified according to the
list of fault codes
no
6) External alarm
Is an external alarm
connected to the system?
Is ALARM terminal in
mainboard disconnected?
yes
Short connect that
terminal
Solve problem
accordingly
yes
if failure disappear after
PCB is changed
yes
no
replace PCB
dredge piping
yes
Refrigerant charge is
needed. Check if there is
refrigerant leak. If yes,
replace pipe.
yes
is pipe blocked?
no
Is high pressure too low?
yes
yes
high pressure failure
no
low pressure failure
no
yes
Is actual pressure detected by
pressure gage acceptable?
yes
yes
Replace PCB
no
Are ports in PCB cut
off?
Does system have
pressure switch?
Confirm the fault according
to the fault code list
7) Pressure protection
Note: The confirmation time of low pressure failure may be shorter, but
high pressure failure confirmation time is at least 1 hour. Besides, take
the ambient temperature into consideration.
Make them in
short circuit
no
Change pressure
switch
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Summary of Contents for AB072XCBAA
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Page 138: ... a__WcU S c a V e a Wc AU282XHBAA AU422XIBAA PCB printed diagram 138 ...
Page 141: ... a__WcU S c a V e a Wc AU84NXTBAA PCB printed diagram 141 ...
Page 144: ... a__WcU S c a V e a Wc AB AE AD units PCB printed diagram 144 ...
Page 149: ... a__WcU S c a V e a Wc AF07 142XCBAA PCB printed diagram 149 ...
Page 180: ...MEMO Commercial Air Conditioner ...