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check fan motor and capacitor
Note: This protection feature is not available with all models. In the event that compressor is on and off frequently for no
reason, check if the compressor is provided with discharging temperature protection. The protection is activated when
temperature is higher than 120° C and restored when lower than 100° C.
Conduct leak test.
Evacuate and recharge
yes
Measure equalized pressure and
running pressure to see if the
system is overfed or starved. Is
there a leak? Is capillary tube
clogged?
no
repair or replace
yes
Is piping twisted or
deformed?
no
cleaning
Is filter or heat exchanger dirty?
yes
yes
no
no
Does indoor fan motor work properly in
heating cycle? Does outdoor fan motor
work properly in cooling cycle?
replace PCB
Air conditioner is
running in bad
condition?
Unclog piping
If the pipe is
blocked?
Are they too low?
Are high pressure and
low pressure normal?
replace PCB
yes
yes
yes
yes
yes
yes
no
no
no
Is discharging temperature
sensor in good condition?
no
Is discharging temperature detected
by a thermometer too high?
open valves
no
Are stop valves in suction pipe and
liquid pipe of outdoor unit open?
Refrigerant charge is needed
start
replace discharging sensor
8)Compressor discharging temperature protection
yes
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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 ...