Troubleshooting | 33Revised 08/14
8 733 914 818 (2014/08)SV Heat Pump Series
TROUBLESHOOTING
UNIT TROUBLESHOOTING
Problem Mode Check Possible Cause Action
Cooling Heating
No compressor
operation but fan runs
X
Is fault LED Blinking
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
High Pressure fault - no
or low air flow
Check fan motor for proper
operation.
Check air filter
Inspect air coil for dirt/debris
Check duct work - are dampers
closed or blocked?
X
Is fault LED Blinking
2 times?
Low Pressure fault - no
or low air flow
Check fan motor for proper
operation.
Check air filter
Inspect air coil for dirt/debris
Check duct work - are dampers
closed or blocked?
Low Pressure fault - low
refrigerant
Check refrigerant pressure with
gauge set
X
Low Pressure fault - no
or low water flow
Check water valves and/or pumps
for proper operation. Check for
water coil blockage.
75Unit
Check for proper flow rate and
water temperature, but low water
side temp drop in heating.
Low Pressure fault - low
refrigerant
Check refrigerant pressure with
gauge set
X
Is fault LED Blinking
3 times?
Freeze fault, water coil -
no or low water flow
Check water valves and/or pumps
for proper operation. Check for
water coil blockage.
Freeze fault - low water
temperature
Check water temperature - is it
below 40° entering? If heat pump is
connected to a closed loop with
antifreeze check that the "FREEZE
1" resistor on the UPM board has
been cut to set the unit to
antifreeze mode (see UPM features
on pages 15-17).
Freeze fault - low
refrigerant
Check refrigerant pressure with
gauge set
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