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Bosch Greensource SM024 Installation, Operation And Maintenance Manual page 49

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

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