Bosch CA Series - Page 31

Installation, Operation, and Maintenance Manual
CA Series Heat Pumps -8733851021 (2025/04) US
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Unit Troubleshooting
Problem
Mode
Check Possible Cause Action
Cooling Heating
Objectionable noise levels X X
Air noise
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 vibration pad.
Unit cabinet touching
wall or other building
components
Adjust unit location to avoid unit touching structure.
Compressor noise
High water temperature
or low water ow rate
elevating head pressure
Increase water ow rate and/or reduce water temperature
if possible.
Scaled or fouled water
coil elevating heat pres-
sure
Clean/descale water coil.
Low air ow elevating
head pressure
Check lter.
Increase fan speed.
Table 6 Unit Troubleshooting