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6. Discharging temperature protection
no
Open the stop valve
11 flashes of outdoor LED302
When is temperature protection activated: Temperature of
discharge line is above 115° C
Replace TD sensor
yes
cleaning
replace PCB
Are stop valves in gas pipe and liquid
pipe of outdoor unit open totally?
yes
Does EEV work properly during heating cycle?
Check 1) Connector 2) Winding resistance 3)
Valve 4) Mainboard
no
yes
Repair outdoor EEV
Is actual discharging temperature detected
by thermometer too high?
yes
Does indoor fan work properly during heating
cycle? Does outdoor fan work properly during
cooling cycle?
Is discharging temperature
sensor in good condition?
no
no
no
Check fan motor and capacitor
yes
yes
Is filter or heat exchanger dirty?
no
Measure balance pressure and running
pressure to see if the refrigerant is too much or
lack. Is there air in system? Is there a leak?
Conduct leak test.
Evacuate and recharge
yes
no
Is piping twisted or deformed? Is piping
clogged with weld?
yes
Adjustment or
replacement
no
When TD is high, if SV2 by pass circuit
can work normally
no
Check coil and valve body of
electromagnetic valve.
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