Troubleshooting; Unit Troubleshooting - Bosch CL Series Installation, Operation And Maintenance Manual

19 Troubleshooting

19.1 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.
Problem
Cooling
X
No compressor
operation but fan runs
X
CL Series Heat Pumps — 8733838716 (2024/05)
Unit Troubleshooting
Mode
Check
Heating
Is the Fault LED
blinking
one (1) time?
Is the Fault LED
blinking
X
one (1) time?
Is the Fault LED
blinking two (2)
times?
19.1.1 Online Help Resources
For FAQs, videos, service bulletins, and more, visit our Service
and Support web page at www.boschheatingcooling.com/
service or use your cell phone to scan the code below.
Possible Cause
High pressure Check water valves and/or pumps for proper
fault—No or low operation. Check for water coil blockage.
water flow
High pressure Check water temperature—is it in range?
fault—High water
temperature
High pressure Check for proper flow rate and water temperature,
fault—fouled or but low-water-side temp rise in cooling.
scaled water coil
Check the fan motor for proper operation.
High
Check the air filter.
pressure fault—No
or low air flow
Inspect the air coil for dirt/debris.
Check duct work—Are dampers closed or blocked?
Check the fan motor for proper operation.
Check the air filter.
Low pressure
fault—No or low air
flow
Inspect the air coil for dirt/debris.
Check duct work—Are dampers closed or blocked?
Low pressure Check refrigerant pressure with a gauge set.
fault—Low
refrigerant
Troubleshooting
Action
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