Carrier 42cvur018-703 Service Manual page 67

11-6. Check Code 18 and 1E
<Check procedure>
Gas leakage, disconnection of TS/TC sensors
Is positioning sound of valve (sound hitting to stopper) heard
from valve when the air conditioner starts the operation
after turning off power of the air conditioner once?
Are temp. sensors of indoor/outdoor units correctly set to the holder?
NOTE :
The temperature sensors which are used to control pulse motor valve
include indoor heat exchanger sensor (TC), outdoor heat exchanger temp.
sensor (TE), outdoor suction temp. sensor (TS) and outdoor sensor (TO).
Remove TC sensor connector from the P.C. board in indoor unit.
(Remove connector from the P.C. board.)
Operate the air conditioner in COOL mode by TEMP button
("Beep" sound is heard if keeping pushed for 10 seconds.).
The operation enters temporary operation mode which fixes opening degree of compressor speed.
Check condensation at outlet of PMV, and then check operating pressure from the service port.
If there is condensation at outlet (1/4 inch = Ø6.35mm valve side), the valve is clogged.
Check the operating pressure from service port, and add gas if pressure is low.
1C
(Check code 02, 1C)
Valve drive check
Is coil of the pulse motor valve
(PMV) correctly set?
YES
Is connecter of coil connected to inverter?
YES
YES
YES
Gas amount check and valve clogging check
Existence of condensation at outlet of PMV
Discharge temp. error, gas leakage
(Check code 03, 1E)
NO
NO
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66
FILE NO. SVM-12052
1E
Set it correctly.
Set it correctly.
NO
Replace coil valve.
NO
Set it correctly.
Replace valve.
Add gas.