
QV Series Heat Pumps
QV Series Heat Pumps
8733829041 (2021/07)
36
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Troubleshooting
Subject to change without prior notice
TROUBLESHOOTING
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.
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.