TAM833
HIGH SUPERHEAT
Superheat above 30F at OD unit
Start Here
Is subcooling at the
outdoor unit
between 8-12F?
Verify line set is
properly sized for
application
NO
Verify that OD
condenser coils
are clean
Add refrigerant
until subcooling
reaches ~10F
Recheck
superheat
Is liquid line temperature
at the indoor unit within
8F of outdoor liquid line
temperature?
Verify line set size
and charge is
correct
NO
Perform “OPEN
VALVE” test at
EVC.
YES
Does
superheat drop
below 30F?
Is indoor
temperature
>85F?
NO
Perform “CLOSE
VALVE” test at
EVC.
YES
Does suction
pressure go
down?
EEV and coil are working.
Replace EVC
Check operation
YES
YES
Perform
temperature
sensor check
YES
NO
The system is running at
maximum capacity and this
may be causing the high
superheat. Wait until the
indoor temperature is less
than 80F and check the
superheat again.
Replace EEV.
Check operation
Ohm coil per FIG 1?
Is ohm reading
correct?
YES
Replace coil
NO
4 - Phase Coil Control
Figure 1
4 - BLUE
5 - BROWN (COMMON)
6 - RED (COMMON)
3 - ORANGE
2 - YELLOW
1 - WHITE
● Brown (common) to Blue or Yellow should measure 46 ohms
● Red (common) to Orange or White should measure 46 ohms
