signals is sent out through drive ICULN2003 to control relay’s ON/OFF. Then the
machine can work well under SCM uniform control.
Chapter II Typical Trouble Analysis
Trouble Detecting Flow for Abnormal Display
Display Abnormal
Display Failure Code
E1：Indoor temperature sensor failure:
sensor plug is in a bad contact with
control panel, or damage in sensor
E2：
Coil pipe temperature sensor:
sensor plug is in bad contact with
control panel, or damage in sensor.
Water-full indicator turns on and display
P2 (Refer to Section One Chapter I)
Display stroke-lack or indicator off :
1.Control panel is in a bad contact with display panel, then
need to re-insert plug .
2.
Damage in display panel, then need to replace display panel.
Trouble Shooting Flow for Machine Turn-On Failure
NO
Re-plug N line and L line , make them in
a good contact with film-inserted
After power-on , key "POWER "cannot run machine:
Check if power cord terminator (N, L) is in a good
contact with control panel film-inserted.
Check if there is 5V voltage out from 7805
YES
NO
YES
Replace main control panel
Check if the link between display panel and main control
panel is loose.
NO
YES
Re-link them
Replace main control panel and display panel .
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