LG ARWN038GA2 Service Manual page 80

Troubleshooting Guide
* Measure the resistance of 4way valve
** Confirm the 4way valve coil is inserted to the end
*** When power is supplied in order as follow
ODU information is displayed one after the other at main PCB 7-segment
1. Model ID
→ 5HP : 60, 6HP : 61, 8HP : 62, 10HP : 63, 12HP : 64, 14HP : 65
2. Total Capacity
→ Displayed with HP
3. ODU Type
→ HEAT PUMP : 2, Cooling : 0
4. Normal mode : 25
5. Refrigerant
→ R410a : 41
***** Checking method for outside unit of 3unit system
➀ Close all the SVC valves of high / low pressure common pipe
➁ Operate system
➂ Check the difference of high and low pressure with LGMV for each unit
➃ If there is a unit in which the difference is not increased then the 4way valve of that unit is defective
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Only for training and service purposes
Location of 4way valve connector on
Main PCB (marked as 4way, CN09)
**** Check the output voltage of terminal socket
during heating operation
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