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Check code Check code name<br />
Cause<br />
[P19] / [08]<br />
(AI-NET)<br />
4-way valve reverse error 1. 4-way valve error<br />
2. TS1 sensor/TE1 sensor error<br />
3. Pd sensor/Ps sensor error<br />
4. TE sensor/TL sensor misconnection<br />
Sub-code: Detected outdoor unit No.<br />
Is 4-way valve<br />
coil connector<br />
connected?<br />
No<br />
Correct connector connection.<br />
(4-way valve coil: CN317)<br />
Yes<br />
Are output voltage<br />
characteristics of Pd and<br />
Ps sensors normal?<br />
No<br />
Sensor error<br />
Yes<br />
Are<br />
characteristics of<br />
resistance value of TS1,<br />
TE1 and TL sensors<br />
normal?<br />
Yes<br />
No<br />
* See “Outdoor unit temperature sensor<br />
characteristics” on “8-9. Sensor Characteristics”.<br />
Sensor error<br />
Are TS1, TE1<br />
and TL sensor<br />
connectors connected<br />
normally?<br />
No<br />
Correct connector connection<br />
TS1 sensor: CN505<br />
TE1 sensor: CN520<br />
TL sensor: CN523<br />
Reset the power supply and<br />
start heating test operation.<br />
Does 4-way valve<br />
operate?<br />
No<br />
Does<br />
Yes discharge refrigerant No<br />
gas bypass to suction<br />
side through 4-way<br />
valve? *1<br />
Yes<br />
If no error occurs in the test<br />
operation, restart operation.<br />
4-way valve error Check 4-way valve.<br />
*1 Check TS1 and TE1 temperature of the outdoor unit which is running.<br />
(I/F) SW01=[1], SW02=[6], SW03=[2] ➝ TS sensor temperature<br />
SW01=[1], SW02=[7], SW03=[2] ➝ TE sensor temperature<br />
<br />
TE1 sensor: Normal if TE1 is 30°C or less in the seasons except<br />
summer (Outside temp 20°C or lower)<br />
TS1 sensor: Normal if TS is 50°C or less in the seasons except<br />
summer (Outside temp 20°C or lower)<br />
Check code Check code name<br />
Cause<br />
[P18] / [E2]<br />
(AI-NET)<br />
Discharge temp TD3 error 1. Outdoor unit service valve closed<br />
2. Outdoor PMV error<br />
3. TD sensor error<br />
4. Refrigerant shortage, clogging of refrigerant circuit<br />
5. 4-way valve error<br />
6. SV4 circuit leakage, misinstallation<br />
Are service<br />
valves of gas and<br />
liquid sides fully<br />
opened?<br />
No<br />
Open service valves fully.<br />
Yes<br />
Is outdoor PMV normal?<br />
1. Connector connection<br />
2. Wiring<br />
3. Coil<br />
4. Valve body<br />
5. Outdoor I/F P.C. board<br />
No<br />
Connectors: PMV1: CN300,<br />
PMV2: CN301, PMV4: CN303<br />
Repair outdoor PMV.<br />
Yes<br />
Are<br />
characteristics of TD3<br />
sensor resistance<br />
normal?<br />
Yes<br />
No<br />
* See “Outdoor unit temperature sensor<br />
characteristics” on “8-9. Sensor Characteristics”.<br />
Replace TD3 sensor.<br />
Does<br />
discharge refrigerant<br />
gas bypass to suction<br />
side through 4-way<br />
valve?<br />
Yes<br />
Check 4-way valve.<br />
No<br />
SV4 circuit<br />
1. Are SV41, SV42 and SV43<br />
valve coils installed correctly?<br />
2. Is SV42 circuit sealed<br />
correctly (no leakage)?<br />
No<br />
Correct installation of valve<br />
coil.<br />
Replace SV43 valve.<br />
Yes<br />
Are indoor units of a<br />
different refrigerant line<br />
connected?<br />
No<br />
Yes<br />
(Check it using the miswiring check<br />
function of the outdoor unit.)<br />
Correct wiring<br />
Refrigerant shortage,<br />
clogging, pipe breakage<br />
(Check there is no pipe breakage, and<br />
then recharge the refrigerant.)<br />
221
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