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SECTION 9 – SERVICE AND TROUBLESHOOTING
PROBLEM
COMPRESSOR(S) WON'T START
LACK OF COOLING EFFECT
146
TROUBLESHOOTING (CONT'D)
CAUSE
1. Demand not great enough.
2. Defective Water Temperature
Sensor.
3. Contactor/Overload failure.
4. Compressor failure.
1. Check DX Coil.
2. Improper air flow through the
DX Coil.
3. Low refrigerant charge. Low
suction pressure will be ob-
served.
FORM 150.73-NM2
ISSUE DATE: 09/07/2020
SOLUTION
1. No problem. Consult "Instal-
lation" Manual to aid in under-
standing compressor operation
and capacity control.
2. Compare the display with a
thermometer. Should be within
+/- 2 degrees. See Section
9 – SERVICE AND TROUBLE-
SHOOTING for RWT/ LWT temp./
voltage table.
3. Replace defective part.
4. Diagnose cause of failure and
replace.
1 Contact the local Johnson Con-
trols service representative.
2. Reduce flow to within unit
design specs. See Limitations in
Installation Section.
3. Check subcooling and add
charge as needed.
JOHNSON CONTROLS
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Troubleshooting
