28
ULTRATEMP
®
Heat Pump Installation and User’s Guide
Problems or Symptoms Possible Cause Corrective Action
HIGH REFRIG Alarm: Refrigerant high
pressure switch is open.
Water circulation pump not on. Verify water pump is on.
Insufficient water flow. Verify filter and skimmers are clean, backwash if necessary.
Minimum flow 30 GPM [113.6 LPM].
External bypass open. Verify external water bypass around heat pump is closed. Also
make sure all other valves are open or in the proper positions to
allow proper water flow through heat pump.
Bad refrigerant high pressure switch. Check resistance of switch, if open, replace switch.
TXV Stuck Closed. 1. Disconnect TXV bulb from suction line (SL), have it in
your hand, if pressures go back to normal, then reinstall
the bulb on suction line (it may have some debris stuck in
the port). For adjustable TXVs open adjustable valve, it
may remove the debris and set it back to original position.
2. If (1) does not work, recover the charge, remove bulb from
SL, unscrew TXV head, shake it, if rattles, replace head (PN
KT-45-ZGA), if not, replace TXV and filter dryer and charge
appropriately.
Other Possibilities: Check Water level in pool. This condition may appear if the heat
pump has NOT been operated for an extended period. To Clear
this condition, cycle the heat pump on and off up to 3 times. If this
does not correct problem, call for service.
Other Possibilities. Low or restricted water
flow through heater. Dirty or worn filters
or clogged lint traps. Clogged filter pump
impeller. Improper plumbing valve settings.
Suction leak allowing air into the water
flow. Low water flow when switched to spa
mode. Unit is plumbed backwards. Heat
exchanger clogged with debris. Internal
bypass valve damaged or clogged with
debris.
Clean entire filtering system and or replace filter element. Inspect
& clean pump impeller. Adjust all plumbing valves. Repair suction
air leaks, grease pump lid O-ring. Replace filter. Wrong filter
pump pipe size. Automatic pool vacuum causing restriction. Call
your dealer or factory for advice if above does not solve the
problem.
Unit overcharged. Reclaim charge. Recharge with appropriate nameplate charge.
LOW REFRIG Alarm: Refrigerant low
pressure switch is open.
Low refrigerant in system. Find source of refrigerant leak and fix. Pull vacuum and recharge.
Air and water temperatures too cold to
operate the heat pump.
Wait until temperatures warm up and see if unit operates.
Bad refrigerant low pressure switch.
Check resistance of switch with a full charge, if open, replace switch.
Faulty fan. Check the capacitor and fan motor. Replace either one if it is
faulty. Check the fan blade and make sure it is not slipping or
broken. If so, replace the fan.
TXV Stuck Closed. 1. Disconnect TXV bulb from suction line (SL), have it in
your hand, if pressures go back to normal, then reinstall
the bulb on suction line (it may have some debris stuck in
the port). For adjustable TXVs open adjustable valve, it
may remove the debris and set it back to original position.
2. If (1) does not work, recover the charge, remove bulb from
SL, unscrew TXV head, shake it, if rattles, replace head (PN
KT-45-ZGA), if not, replace TXV and filter dryer and charge
appropriately.
Insufficient airflow through air coil Remove surrounding debris or shrubs or heat pump
maintenance by qualified personnel.
LOW AMBIENT TEMP Alarm: Refrigerant
temperature sensor indicates air temperature
is too low for heat pump operation.
Defrost cycle did not complete within
allotted time
Wait until ice melts from evaporator coil and/or air temperatures
rise.
Bad thermistor. View reported suction temperature on control board. Use 10k
ohm resistance test to verify thermistor.
FIVE ALARMS: Indicates 5 faults have
occurred in 1 hour. This fault will automatically
reset in one hour or can be manually reset by
pressing the ON/OFF button.
5 alarms of any kind within one hour. Press the ON/OFF button to clear the alarm. Check Heat Pump
over the next few minutes/hours to see if alarm appears again.
This alarm most likely caused the five alarms in one hour.
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