Troubleshooting
18 Troubleshooting
18.1 Unit Troubleshooting
NOTICE
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.
18.1.1 Online Help Resources
For FAQs, videos, service bulletins, and more, visit our Service
and Supp
ort web page at www.boschheatingcooling.com/
service or use your cell phone to scan the code below.
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 flow
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 flow 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 flow
Check the fan motor for proper operation.
Check the air filter.
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 flow
Check the fan motor for proper operation.
Check the air filter.
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.
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RL Series Heat Pumps — 8733842393 (2024/03)
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