Unit Troubleshooting | 49Greensource CDi Series SM Model
8733819578 (2019/02)Greensource CDi Series SM Model
Subject to change without prior notice
LOW-PRESSURE
FAULT
Compressor,
Loop Pump
Reduced or no water flow
Check pump operation/check flow
rate.
Water temperature out of
range
Bring water temperature within range.
Reduced airflow
Check for dirty air filter or coil. Check
fan motor operation and airflow
restriction.
Undercharged with
refrigerant
Check and service system refrigerant.
RAT outside of nominal
range
Bring air temperature within range.
Bad low pressure switch
Verify continuity and/or replace
switch.
FREEZE COAXIAL
FAULT
Compressor,
Loop Pump
Reduced or no water flow
Check pump operation/check flow
rate.
Inadequate antifreeze level
Check antifreeze density with
hydrometer/service.
Temperature limit setting
adjust freeze protection setting
15–26ºF.
Water temperature out of
range
Bring water temperature within range.
Bad thermistor
Check temperature and impedance
correlation. Service/replace.
CONDENSATE
OVERFLOW FAULT
Compressor,
Loop Pump
Blocked drain
Check for blockage and clean the
drain.
Improper trap
Check trap dimensions and location
ahead of vent. Service/replace.
Poor drainage
Check pipe sloping and check venting.
Service/replace.
Moisture on sensor
Check for moisture shorting to air coil.
Service/replace.
Plugged air filter Replace air filter.
Restricted return air flow
Find and eliminate restriction.
Increase return duct/grill size.
Unit Troubleshooting
Problem Check Possible Cause Action
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