SM Series Heat Pump
SM Series Heat Pump8733942411 (2017/07) Subject to change without prior notice
38 | Troubleshooting
UNIT TROUBLESHOOTING
Problem Mode Check Possible Cause Action
Cooling Heating
Objectionable noise
levels
X
X
Air noise
Poor duct work/grille
design
Ensure duct work and grilles are properly sized
for unit air flow.
Fan speed setting too
high
Consult blower performance table and reduce fan
speed if possible.
Structure bourne noise
Unit not mounted on full
vibration pad
Mount unit on a vibration pad (see page 7).
Unit not connected with
flexible conduit, water
lines and/or duct work
Install unit in accordance with instructions on
pages 5-15.
Unit cabinet touching wall
or other building
component
Adjust unit location to avoid unit touching
structure.
X
X Compressor noise
High water temperature
or low water flow rate
elevating head pressure
Increase water flow rate and/or reduce water
temperature if possible.
Scaled or fouled water
coil elevating heat
pressure
Clean/de scale water coil.
Low air flow elevating
head pressure
Check filter.
Increase fan speed.
X
X Water hammer Fast closing valves
installed
Change valves to slow-close type.
HRP Troubleshooting
Problem Possible Cause Checks and Corrections
NO FLOW
LOW FLOW
No Power Check power supply
On/Off Switch Position
Set switch to “ON” position
Compressor Contactor
Engage heat pump contactor
Broken or loose wires
Repair or tighten wires
Air Lock
Purge air from piping system
Stuck pump shaft/impeller
Remove pump cartridge and clean
Defective pump
Replace pump
Kinked or under sized water piping
Repair kink and check for proper line size
HIGH WATER
TEMPERATURE
Water temp limit closed Stuck limit switch
Sensor not attached securely to line
LOW HEAT OUTPUT Scaled or fouled heat exchanger Clean heat exchanger
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