Troubleshooting | 25WW & WT Models
8733943362 (2016/08)Revised 08-16
Unit Lockouts
Periodic lockouts almost always are caused by air or
water flow problems. The lockout (shutdown) of the unit
is a normal protective measure in the design of the
equipment. If continual lockouts occur call a mechanic
immediately and have them check for: water flow
problems, water temperature problems, air flow
problems or air temperature problems. Use of the
pressure and temperature charts for the unit may be
required to properly determine the cause.
HRP Troubleshooting
Problem Possible Cause Checks and Corrections
NO FLOW
LOW FLOW
No Power Check power supply
On/Off Switch Position
Set switch to “ON” position
Compressor Contactor
Engage heat pump contactor
Broken or loose wires
Repair or tighten wires
Air Lock
Purge air from piping system
Stuck pump shaft/impeller
Remove pump cartridge and clean
Defective pump
Replace pump
Kinked or under sized water piping
Repair kink and check for proper line size
HIGH WATER
TEMPERATURE
Water temp limit closed Stuck limit switch
Sensor not attached securely to line
LOW HEAT OUTPUT Scaled or fouled heat exchanger Clean heat exchanger
UPM I Board LED Indications
Indication
Color
Blinks Description
GREEN Solid 18-30 VAC Power is present
RED 1 High pressure lockout
RED 2 Low pressure lockout
RED 3 Source Freeze sensor
lockout
RED 5 Brownout
RED 6 Load Freeze Sensor Lockout
UPM II Board LED Indications
Indication
Color
Blinks Description
GREEN Solid 18-30 VAC Power is present
RED 1 High pressure lockout
RED 2 Low pressure lockout
RED 3 Freeze sensor lockout
RED 5 Brownout
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