Troubleshooting
Unit not shifting into
cooling and heating
X X
Reversing valve
solenoid energized
Faulty solenoid
Check that the reversing valve solenoid is receiving
24 VAC.
If it is receiving 24 VAC, check the resistance of the
solenoid—an open circuit may indicate a burned out
solenoid.
Reversing valve
solenoid NOT
energized
Miswired/faulty
thermostat
Check that the reversing valve thermostat wire is
connected to the “O” terminal of the thermostat.
Check for a contact closure between “O” and “R.”
Loose wire on “O”
terminal
Check that the wires from the thermostat to the
unit are securely connected and that the wires from
the electrical box to the reversing valve are
connected.
Excessively cold
supply air
temperature in
cooling or excessively
hot supply air
temperature in
heating
X X Reduced air flow
Dirty Filter Replace filter.
Fan speed too low
Consult blower performance table and increase fan
speed if possible.
Excessive duct
pressure drop
Consult blower performance table and increase fan
speed if possible.
Excessively warm
supply air
temperature in
cooling and/or
excessively cool air in
heating
X X
Air flow too high
Fan speed setting
too high
Consult blower performance table and reduce fan
speed if possible.
High or low water
temperature
Inlet water
temperature out of
range
Check unit capacity vs. water temperature.
Air leakage Leaky duct work Inspect the duct work.
Loss of
refrigeration
capacity
Low refrigerant
Check refrigerant pressures with a gauge set.
High humidity X
Air flow is too high
Fan speed setting is
too high
Consult the blower performance table and reduce
fan speed if possible.
Lost of
refrigeration
capacity
Low refrigerant
Check refrigerant pressures with gauge set.
Short cycling
Unit oversized
Check unit performance against building load
calculations.
Poor thermostat
location
Make sure that the thermostat is not located near a
supply air duct.
Unit Troubleshooting
Problem
Mode
Check Possible Cause Action
Cooling Heating
56 |
RF Series Heat Pumps — 8733980022 (2024/12)
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