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Verify that OD
condenser coils
are clean
Add refrigerant
until subcooling
reaches ~10F
Recheck
superheat
Replace coil
AM7A0C36H31-SF-1A
HIGH SUPERHEAT
Superheat above 30F at OD unit
Verify line set is
properly sized for
NO
application
EEV and coil are working.
Replace EVC
Check operation
YES
Does suction
pressure go
down?
Ohm coil per FIG 1?
Is ohm reading
NO
correct?
YES
Replace EEV.
Check operation
Start Here
Is subcooling at the
outdoor unit
YES
between 8-12F?
Is liquid line temperature
at the indoor unit within
8F of outdoor liquid line
Perform "CLOSE
VALVE" test at
YES
EVC.
Figure 1
4 - Phase Coil Control
4 - BLUE
5 - BROWN (COMMON)
6 - RED (COMMON)
● Brown (common) to Blue or Yellow should measure 46 ohms
● Red (common) to Orange or White should measure 46 ohms
18
Perform
temperature
sensor check
NO
temperature?
The system is running at
maximum capacity and this
YES
may be causing the high
superheat. Wait until the
Perform "OPEN
indoor temperature is less
VALVE" test at
than 80F and check the
EVC.
Does
superheat drop
NO
below 30F?
NO
3 - ORANGE
2 - YELLOW
1 - WHITE
Verify line set size
and charge is
correct
superheat again.
YES
Is indoor
temperature
>85F?
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