Pentair ULTRATEMP ETi 220 Installation And User Manual page 42

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Problems or Symptoms
HIGH REFRIG Alarm: Refrigerant high
pressure switch is open.
LOW REFRIG Alarm: Refrigerant low
pressure switch is open.
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.
HI LIMIT SWITCH: Water temperature is
above 127° F [52.8° C].
ULTRATEMP ETI™ Hybrid Heater Installation and User's Guide
Possible Cause
1. Water circulation pump not on.
2. Insufficient water flow.
3. External bypass open.
4. Bad refrigerant high pressure switch.
5. TXV Stuck Closed.
6. Other Possibilities:
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.
8. Unit overcharged.
1. Low refrigerant in system.
2. Air and water temperatures too cold to
operate the heater.
3. Bad refrigerant low pressure switch.
4. Faulty fan.
5. TXV Stuck Closed.
6. Insufficient airflow through air coil.
5 alarms of any kind within one hour.
1. Insufficient water flow
2. Excessive inlet water temperature
3. High limit switch wiring faulty
4. High limit switch faulty
Corrective Action
Verify water pump is on.
Verify filter and skimmers are clean, backwash if necessary.
Minimum flow 30 GPM [113.6 LPM].
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.
Call for professional servicing.
Call for professional servicing.
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.
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.
Call for professional servicing.
Call for professional servicing.
Wait until temperatures warm up and see if unit operates.
Check resistance of switch with a full charge, if open, replace switch.
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.
Call for professional servicing.
Remove surrounding debris or shrubs or heater maintenance by
qualified personnel.
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.
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.
Verify inlet water temperature is below 104° F [40° C]. Refer to HIGH
WATER TEMP Alarm Troubleshooting
Verify high limit switch connections in low voltage box. Clean or
replace terminals.
Check for continuity between switch terminals with water
temperature below 100° F [37.8° C]. Replace high limit switch if
faulty.