Greensource CDi Series TW Model
Greensource CDi Series TW Model8733954853 (2020/04)
32 | Troubleshooting
Subject to change without prior notice
Table 9 Unit Troubleshooting
HRP Troubleshooting
Table 10 HRP Troubleshooting
INSUFFICIENT
COOLING OR
HEATING
Unit Undersized
Recalculate heating and or cooling loads. If excessive,
possibly adding insulation and shading will rectify the
problem.
Fluid Flow
Check for the lack of adequate fluid flow.
Refrigerant Charge
Refrigerant charge low causing inefficient operation.
Compressor
Check for defective compressor. If discharge is too low
and suction pressure is too high, compressor is not
pumping properly. Replace compressor.
Reversing Valve
Defective reversing valve creating bypass of refrigerant
from discharge of suction side of compressor. Replace
reversing valve.
Operating Pressures
Compare unit operation pressures to the pressure/
temperature chart for the unit.
TXV
Check TXV for possible restriction or defect. Replace if
necessary.
Moisture, Non-
condensables
The refrigerant system may be contaminated with
moisture or non-condensables. Reclaim refrigerant,
replace filter dryer, evacuate the refrigerant system, and
recharge with factory recommended charge.
Unit Troubleshooting
Problem Possible Cause Checks and Corrections
Problem Possible Cause Checks and Corrections
NO FLOW
LOW FLOW
No Power Check the power supply.
On/Off Switch Position
Set switch to “ON” position.
Compressor Contactor
Engage the heat pump contactor.
Broken or loose wires
Repair or tighten the wires.
Air Lock
Purge the air from piping system.
Stuck Pump Shaft/Impeller
Remove the pump cartridge and clean.
Defective Pump
Replace the pump.
Kinked or Undersized Water Piping
Repair the kink and check for proper line
size.
HIGH-WATER
TEMPERATURE
Water Temp Limit Closed
Check for a stuck limit switch.
Check for a sensor not securely attached to
the line.
LOW HEAT
OUTPUT
Scaled or Fouled Heat Exchanger Clean the heat exchanger.
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