
QV Series Heat Pumps
QV Series Heat Pumps
8733829041 (2021/07)
38
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Troubleshooting
Subject to change without prior notice
NO
COMPRESSOR
OPERATION
BUT FAN RUNS
(CONTINUED)
X
X
Is the Fault
LED
blinking five
(5) times?
Brown out
fault—Low
voltage
supply
Check primary voltage—Ensure it is
between the limits listed on the unit
data plate.
Brown out
fault—Bad
thermostat
connection
Check control voltage—if below 18V
check accessories connected to the
unit and ensure they do not exceed
the VA draw shown in Table 2 on page
Check that thermostat wiring is
proper gauge and length, that it is not
damaged and that all connections at
the thermostat and heat pump are
secure.
X
Is the Fault
LED
blinking six
(6) times?
Freeze fault,
air
coil—No or
low air
flow
Check fan motor for proper operation.
Check the air filter.
Inspect the air coil for dirt/debris.
Check duct work—Are dampers closed
or blocked?
Freezer fault,
air coil—
Blocked
return air
Check that there is adequate space
between the return air opening and
walls or other obstructions on free
return applications.
Freezer fault,
air coil—Low
refrigerant
Check refrigerant pressure with a
gauge set.
X
X
No Fault LED—
Contractor
Not Energized
Thermostat
not calling for
compressor
operation
Ensure that the thermostat is ON and
calling for "Y."
Bad
thermostat
connection
Check "Y" connection from
thermostat—Ensure that there is 24
VAC between "Y" and "C."
Loose wire to
contactor
coil
Check wiring—Ensure that there is 24
VAC across the contactor coil.
Burned out
contactor
coil
Test contactor with 24 VAC (between
"R" and "C"). Ohm contactor coil—an
open circuit indicates a burned coil.
Unit Troubleshooting
Problem
Mode
Check
Possible
Cause
Action
Cooling
Heating