Bosch Greensource CDi Series Installation, Operation And Maintenance Manual page 38

38 | Troubleshooting
Problem Mode
Cooling
X
Objectionable noise
levels
X
X
Problem
NO FLOW
LOW FLOW
HIGH WATER
TEMPERATURE
LOW HEAT OUTPUT
8733942411 (2017/07)
UNIT TROUBLESHOOTING
Check
Heating
Air noise
X
Structure bourne noise
X Compressor noise
X Water hammer
HRP Troubleshooting
Possible Cause
No Power
On/Off Switch Position
Compressor Contactor
Broken or loose wires
Air Lock
Stuck pump shaft/impeller
Defective pump
Kinked or under sized water piping
Water temp limit closed
Scaled or fouled heat exchanger
Subject to change without prior notice
Possible Cause
Poor duct work/grille Ensure duct work and grilles are properly sized
design
Fan speed setting too Consult blower performance table and reduce fan
high
Unit not mounted on full Mount unit on a vibration pad (see page 7).
vibration pad
Unit not connected with Install unit in accordance with instructions on
flexible conduit, water
lines and/or duct work
Unit cabinet touching wall Adjust unit location to avoid unit touching
or other building
component
High water temperature Increase water flow rate and/or reduce water
or low water flow rate
elevating head pressure
Scaled or fouled water
coil elevating heat
pressure
Low air flow elevating
head pressure
Fast closing valves
installed
Checks and Corrections
Check power supply
Set switch to "ON" position
Engage heat pump contactor
Repair or tighten wires
Purge air from piping system
Remove pump cartridge and clean
Replace pump
Repair kink and check for proper line size
Stuck limit switch
Sensor not attached securely to line
Clean heat exchanger
SM Series Heat Pump
Action
for unit air flow.
speed if possible.
pages 5-15.
structure.
temperature if possible.
Clean/de scale water coil.
Check filter.
Increase fan speed.
Change valves to slow-close type.
SM Series Heat Pump