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ULTRATEMP ETI™ Hybrid Heater Installation and User’s Guide
Problems or Symptoms
Possible Cause
Corrective Action
HIGH REFRIG Alarm
: Refrigerant high
pressure switch is open.
1. Water circulation pump not on.
Verify water pump is on.
2. Insufficient water flow.
Verify filter and skimmers are clean, backwash if necessary.
Minimum flow 30 GPM [113.6 LPM].
3. External bypass open.
Verify external water bypass around heater is closed. Also make
sure all other valves are open or in the proper positions to allow
proper water flow through heater.
4. Bad refrigerant high pressure switch.
Call for professional servicing.
5. TXV Stuck Closed.
Call for professional servicing.
6. Other Possibilities:
Check Water level in pool. This condition may appear if the heater
has NOT been operated for an extended period. To Clear this
condition, cycle the heater on and off up to 3 times. If this does not
correct problem, call for service.
7. 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. 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.
8. Unit overcharged.
Call for professional servicing.
LOW REFRIG Alarm:
Refrigerant low
pressure switch is open.
1. Low refrigerant in system.
Call for professional servicing.
2. Air and water temperatures too cold to
operate the heater.
Wait until temperatures warm up and see if unit operates.
3. Bad refrigerant low pressure switch.
Check resistance of switch with a full charge, if open, replace switch.
4. 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.
5. TXV Stuck Closed.
Call for professional servicing.
6. Insufficient airflow through air coil.
Remove surrounding debris or shrubs or heater maintenance by
qualified personnel.
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 Heater over the
next few minutes/hours to see if alarm appears again. This alarm
most likely caused the five alarms in one hour.
HI LIMIT SWITCH:
Water temperature is
above 127° F [52.8° C].
1. Insufficient water flow
Increase pump speed or flow setting.
Water flow obstruction. Verify proper flow to heater. Refer to
LOW
WATER FLOW
Alarm troubleshooting.
Internal bypass valve stuck open. Repair or replace internal
plumbing.
2. Excessive inlet water temperature
Verify inlet water temperature is below 104° F [40° C]. Refer to
HIGH
WATER TEMP
Alarm Troubleshooting
3. High limit switch wiring faulty
Verify high limit switch connections in low voltage box. Clean or
replace terminals.
4. High limit switch faulty
Check for continuity between switch terminals with water
temperature below 100° F [37.8° C]. Replace high limit switch if
faulty.
