Installation, Operation, and Maintenance Manual
CA Series Heat Pumps - 8733851021 (2025/04) US
26 |
20 Troubleshooting
20.1 Unit Troubleshooting
If troubleshooting a system that is low on refrigerant due to a system leak, do not
simply add refrigerant. The leak must be found and repaired per F-Gas regulation.
Unit Troubleshooting
Problem
Mode
Check Possible Cause Action
Cooling Heating
No compressor
operation but fan
runs
X
Is the Fault LED blinking
one (1) time?
High pressure fault—No
or low water ow
Check water valves and/or pumps for proper operation. Check for
water coil blockage.
High pressure fault—
High water temperature
Check water temperature—is it in range?
High pressure fault—
fouled or scaled water
coil
Check for proper ow rate and water temperature, but low-water-
side temp rise in cooling.
X
Is the Fault LED blinking
one (1) time?
High pressure fault—No
or low air ow
Check the fan motor for proper operation.
Check the air lter.
Inspect the air coil for dirt/debris.
Check duct work—Are dampers closed or blocked?
X
Is the Fault LED blinking
two (2) times?
Low pressure fault—No
or low air ow
Check the fan motor for proper operation.
Check the air lter.
Inspect the air coil for dirt/debris.
Check duct work—Are dampers closed or blocked?
Low pressure fault—Low
refrigerant
Check refrigerant pressure with a gauge set.
20.1.1 Online Help Resources
For FAQs, videos, service bulletins, and more, visit our Service and Support web
page at www.bosch-homecomfort.us/service or use your cell phone to scan the
code below.
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