Troubleshooting | 35LV Heat Pump Series
8 733 905 683 (2016/09)LV 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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