ULTRATEMP
®
Heat Pump Installation and User’s Guide
27
Problem or Symptoms
Possible Cause
Corrective Action
HIGH WATER TEMP Alarm:
Water temperature above 108° F.
Bad Thermistor or bad 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.
LOW WATER TEMP Alarm:
Water temperature below 40° F.
Bad Thermistor or bad control board.
Debris is shorting the connections.
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.
Remove debris or replace PCB.
LOW WATER FLOW Alarm: The pressure
switch sensing water flow is open.
1. Water circulation pump not on.
Verify water circulation pump is on.
2. Insufficient water flow.
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.
3. External bypass open.
Make sure external water bypass around heat pump is closed.
4. Bad water pressure switch.
With water flowing, check resistance of water pressure switch,
if open, replace switch.
REMOTE POOL SPA Alarm:
Pool and Spa remote inputs are
simultaneously energized.
Remote pool, spa, and common spade
terminals on the back of the control board
are all energized.
Modify automation control output so that only either the pool
and common or spa and common terminals are energized.
WATER THERM SHORT Alarm:
Water temperature sensor circuit is shorted.
Bad Thermistor or bad control board.
Use the 10k ohm resistance test to verify thermistor. If shows
shorted, replace thermistor. If good, replace control board.
WATER THERM OPEN Alarm:
Water temperature sensor circuit is open.
Bad Thermistor, or bad control board.
Use the 10k ohm resistance test to verify thermistor. If shows
open, replace thermistor. If good, replace control board.
SUCTION TH SHORT Alarm: Defrost
refrigerant temperature sensor circuit is
shorted.
Bad Thermistor or bad control board.
Use the 10k ohm resistance test to verify thermistor. If shows
shorted, replace thermistor. If good, replace control board.
SUCTION TH OPEN Alarm: Defrost
refrigerant temperature sensor circuit is
open.
Bad Thermistor or bad control board.
Use the 10k ohm resistance test to verify thermistor. If
shows an open, replace thermistor. If good, replace control
board.
BROWNOUT Alarm: The 24 VAC supply
voltage to the control board is low.
CAUTION: High Voltage Checks.
Observe extreme caution or call dealer or
factory for advice before attempting to
Troubleshoot Electrical Box.
1. Bad transformer
Supply voltage to the transformer should be between 208 and
260 volts. Transformer should output between 24 and 28 volts.
If below this range, replace transformer.
2. Insufficient supply voltage to the heat
pump.
Check supply voltage to the heat pump. Supply voltage should
be between 208 and 260 volts. Check to see if a phase is out.
Should have 120 volts to ground and 240 volts across power
legs. A boost transformer may be needed closer to the heat
pump to get voltages within proper range.
TROUBLESHOOTING
RISK OF ELECTRICAL SHOCK OR ELECTROCUTION.
Improper 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:
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.
Always turn power to the unit OFF before servicing or repair.
Refer to 10K Ohm Temperature Resistance Chart on page 25.
Note
: Any service must be done by an authorized service agency person.
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