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

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.
Problem
Cooling
X
No compressor
operation but fan runs
X
40 |
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?
18.1.1 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 fault— Check water valves and/or pumps for proper
No or low water flow operation. Check for water coil blockage.
High pressure fault— Check water temperature—is it in range?
High water
temperature
High pressure fault— Check for proper flow rate and water
Fouled or scaled temperature, but low-water-side temp rise in
water coil cooling.
Check the fan motor for proper operation.
High
Check the air filter.
pressure fault—No
Inspect the air coil for dirt/debris.
or low air flow
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 fault— Check refrigerant pressure with a gauge set.
Low refrigerant
RL Series Heat Pumps — 8733842393 (2024/03)
Action