Trane TAMXB0A24V21DB Installation, Operation And Maintenance Manual page 69

Troubleshooting Low Superheat
Perform these steps if Superheat is less than 3°F
STEP 1
Sensors
Verified
Yes
STEP 2
4-Flash
EVC Error
No
STEP 3
Is indoor motor
running
Yes
System
is clean and free
of debris
Yes
P2
18-GJ89D1-1F-EN
Perform Sensor
Check as per Service
No
Facts Troubleshooting
Flowchart
3rd party
shutdown device
Yes
installed
No
System has
proper
No
Superheat
Yes
Correct issue and
No
retest for Low
Superheat
No
Correct and retest for
No
Low Superheat
No
Device wired in
Yes
series with R or
aux contacts?
Yes
Rewire shutdown
device. Retest
System has
proper
Superheat
System has
proper
Superheat
T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g
No
To
A
To
Yes
A
To
Yes
A
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