LG LV-B2461CL Manual page 56

Possible Trouble 5
Is 4way-valve operated?
YES
Is IC02M operated
normally?
YES
Check the RY-4WAY
and 4way-valve
Possible Trouble 6
Is the F/OP key
any problem?
NO
Check P.C.B pattern check
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Only for training and service purposes
: Ineffective Heating
NO
NO
: The unit does not operate by forced operation switch.
YES
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Check RY-4WAY
Exchange IC02M
Exchange F/OP key
LGE Internal Use Only