Section 5: Troubleshooting - Pentair UltraTemp User Manual

Section 5
Troubleshooting
Use the following troubleshooting information to resolve possible problems with your heat pump.
WARNING — RISK OF ELECTRICAL SHOCK OR ELECTROCUTION.
Improperly installation will create an electrical hazard which could result in death or serious injury
to pool users, installers, or others due to electrical shock, and may also cause damage to property.
Do NOT attempt any internal adjustments inside the heater.
1. Keep your hands and hair clear of the fan blades to avoid injury.
2. If you are not familiar with your pool filtering system and heater:
Note: Turn off power to unit prior to attempting service or repair.
Problems and Corrective Action
Fault Condition
HIGH WATER TEMP Alarm: Water
temperature above 108° F.
LOW WATER TEMP Alarm: Water
temperature below 40° F.
LOW WATER FLOW Alarm: The
pressure switch sensing water flow is
open.
REMOTE POOL SPA Alarm: Pool and
Spa remote inputs are simultaneously
energized.
WATER THERM SHORT Alarm: Water
temperature sensor circuit is shorted.
WATER THERM OPEN Alarm: Water
temperature sensor circuit is open.
SUCTION TH SHORT Alarm: Defrost
refrigerant temperature sensor circuit is
shorted.
SUCTION TH OPEN Alarm: Defrost
refrigerant temperature sensor circuit is
open.
* Refer to 10K Ohm Temperature Resistance Chart on
a. Do NOT attempt to adjust or service without consulting your dealer, professional pool or air
conditioning contractor.
b. Read the entire Installation & User's Guide before attempting to use, service or adjust the
heater or pool filtering system. The water pressure switch should be adjusted to turn the
heater off when the pump is off. Setting the switch to close at too low of a flow can damage the
appliance. Adjust the switch to turn the heater off, not on.
Possible Cause
Bad Thermistor or bad control board.
Bad Thermistor or bad control board.
1. Water circulation pump not on.
2. Insufficient water flow.
3. External bypass open.
4. Bad water pressure switch.
Remote pool, spa, and common spade terminals
on the back of the control board are all
energized.
Bad Thermistor or bad control board.
Bad Thermistor, or bad control board.
Bad Thermistor or bad control board.
Bad Thermistor or bad control board.
Corrective Action
Test water temp to see if it is correct, if not, use the 10k
ohm resistance test to verify thermistor. If bad, replace
thermistor. If good, replace control board.
Test water temp to see if it is correct, if not, use the 10k
ohm resistance test to verify thermistor. If bad, replace
thermistor. If good, replace control board.
Verify water circulation pump is on.
Dirty or worn filters or clogged lint traps. Verify filter is
clean, backwash if necessary to clean entire filter system
or replace filter element if needed. Inspect & clean pump
impeller. Adjust Plumbing valves. Repair suction air
leaks.
Make sure external water bypass around heat pump is
closed.
With water flowing, check resistance of water pressure
switch, if open, replace switch.
Modify automation control output so that only either the
pool and common or spa and common terminals are
energized.
Use the 10k ohm resistance test to verify thermistor.
If shows shorted, replace thermistor. If good, replace
control board.
Use the 10k ohm resistance test to verify thermistor.
If shows open, replace thermistor. If good, replace
control board.
Use the 10k ohm resistance test to verify thermistor.
If shows shorted, replace thermistor. If good, replace
control board.
Use the 10k ohm resistance test to verify thermistor.
If shows an open, replace thermistor. If good, replace
control board.
page 42.
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Installation and User's Guide
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