Samsung AVXC4H052/072/100/110/145CE, Service Manual

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Troubleshooting
Samsung Electronics 4-128
4-4-35 : EEV Off-malfunctions (1
st
)
1. How to check
The above malfunction codes do not indicate a malfunction of the product. All you have to do is change the temperature suitably for
the limits shown in the manual. When the product malfunctions, if the actual situation does not match the above diagnosis, measure
the temperature of incoming air with S-net to see if the measurement is the same as the actual outdoor temperature. If not, replace
the temperature sensor.
2. Inspection:
1) See if the EEV cable is properly connected to the indoor machine PCB.
2) See if the EEV coil is inserted into the EEV main body.
3) Visually inspect the rust on the EEV coil. Measure the inter-terminal resistance and look for open/short circuited areas.
4) Press the outdoor machine PCB reset button (K3) to see if the same error occurs again.
- Problems with turning off, then start the indoor machine where the error occurs.
- Problems with turning on, then do not operate the indoor machine where the error occurs.
5) If the above inspections successful, replace the electronic expansion valve of the problematic indoor machine.
- It is very complicated work to replace the electronic expansion valve because it takes a collection of coolant from the system.
Before replacement, you must check the above items.
4-4-36 : EEV Off inefficiently (1
st
)
1. Diagnosis:
1) Check only if the AC is on. (The following conditions met for more than 20 minutes.).
2) Check if the heater is on. (All the conditions should be met.)
- Min. two indoor machines operate when the thermostat is started.
- The mean high pressure exceeds 18kg/cm2.
- 5 minutes of safe operation.
- Maintained for more than 5 minutes. Indoor machine evaporator inlet temperature<actual temp3°C and evaporator exit
temperature<actual tempe3°C.
2. Inspection
1) Check if the electronic expansion valve is accurately connected to the indoor machine PCB.
2) Check if the electronic expansion valve coil is inserted into the main body.
3) Visually inspect the rust on the EEV coil. Measure the inter-terminal resistance and look for open/short circuited areas.
4) Press the outdoor machine PCB reset button (K3) to see if the same error occurs again.
- Problems with turning off, then start the indoor machine where the error occurs.
- Problems with turning on, then do not operate the indoor machine where the error occurs.
5) If the above inspections are successful, replace the electronic expansion valve of the problematic indoor machine.
- It is very complicated work to replace the electronic expansion valve because it takes a collection of coolant from the system.
Before replacement, you must check the above items.
Cooler exit/exhaust air temp>3°C OK
Sucked air temp-cooler inlet temperature>4°C NO
Sucked air temp-cooler exit temperature>4°C NO
Compressor operation, indoor machine operation, thermostat operation OK
Malfunctions EEV Off-malfunctions