USSPA
USSPA Hot Tubs & Spas Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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COL
Display shows COL and spa enters a cool or protection mode; heating may be limited.
Cold Water Protection / Freeze Mode Indication
DR
Display shows DR and heater is disabled; spa may think it is running dry.
Dry Fire Protection / Low Water in Heater
DRY
Display shows DRY and spa immediately shuts down heater to prevent damage.
Severe Dry Fire Condition
EC
Display shows EC or ECO and spa heats less frequently; temperature may drop between cycles.
Economy Heating Mode Indication
F1
Control panel displays F1 and spa functions are disabled or intermittent; keypad may beep randomly.
Keypad / Topside Control Panel Communication Fault
F2
Display shows F2 and heater does not operate; circulation pump may still run.
Water Temperature Sensor (Thermistor) Fault
F3
Control panel shows F3 and spa may overheat or not heat correctly; heater is disabled.
High-Limit Temperature Sensor Fault
F4
Display shows F4 and heater will not engage; spa may run pumps but not heat.
Heater Relay or Heater Circuit Failure
F5
Control panel shows F5 and jets may not respond correctly; pump speeds may be locked or unavailable.
Pump 1 Control / Relay Fault
F6
Display shows F6 and secondary pump or blower does not operate when commanded.
Auxiliary Pump / Blower Output Fault
F7
Control panel shows F7 and spa may shut down or run erratically; often related to power input issues.
Input Power / Line Voltage Fault
F8
Display shows F8 and spa may not respond to button presses; random resets or lockups occur.
Control System Internal Error
F9
Control panel shows F9 and spa may shut down heating and pumps intermittently.
Overcurrent / System Protection Fault
FLC
Display shows FLC (flow closed) even when pumps are off; heater may not operate correctly.
Flow Switch Stuck Closed
FLO
Display shows FLO and heater will not turn on; circulation appears weak or absent.
Insufficient Water Flow / Flow Switch Open
HL
Display shows HL and spa shuts down heater; pumps may continue to run.
High-Limit Trip / Overheat Protection
ICE
Display shows ICE and spa automatically runs pumps to prevent freezing; user control may be limited.
Freeze Protection Mode Active
LOC
Display shows LOC and buttons do not respond; spa appears locked.
Panel Lock / Child Lock Activated
OH
Display shows OH and spa shuts down pumps and heater; water feels excessively hot.
Overheat Condition Detected
P1
Display shows P1 and spa may not heat; circulation appears weak or intermittent.
Primary Circulation Pump Fault
P2
Display shows P2 and one of the jet pumps does not start or shuts off quickly.
Secondary Jet Pump Fault
SE
Display shows SE or SENSOR and spa may shut down heating.
General Sensor Error
SN1
Display shows SN1 and spa may not heat; temperature reading may be erratic.
Primary Temperature Sensor Error
SN2
Display shows SN2 and spa may shut down heater; high-limit protection may be compromised.
High-Limit Sensor Error
Symptom
Buttons on the topside control panel are unresponsive or trigger the wrong functions.
Keypad Matrix / Button Failure
Symptom
Cover lifter area or cabinet smells strongly of burning plastic or electrical smoke.
Overheating Electrical Component
Symptom
LED lighting in the spa is flickering, partially out, or not responding to color changes.
LED Lighting System Fault
Symptom
Ozone indicator is on but no bubbles appear from the ozone injector.
Ozonator or Injector Failure
Symptom
Spa is leaking water inside the equipment bay; puddles form under the spa.
Internal Plumbing or Component Leak
Symptom
Spa jets are weak even with pumps on high speed.
Reduced Jet Pressure / Flow Restriction
Symptom
Spa makes loud grinding or screeching noises from the pump area when jets are on.
Pump Bearing or Motor Failure
Symptom
Spa powers on but will not heat; temperature remains below setpoint despite long run times.
No Heat Condition
Symptom
Spa trips the GFCI/RCD immediately or shortly after turning on.
Ground Fault / Electrical Leakage
Symptom
Spa vibrates excessively or makes banging noises when jets are on.
Hydraulic Imbalance / Pump or Jet Vibration
Symptom
Spa water is cloudy, foamy, or has a strong odor despite filtration.
Water Quality / Filtration Inefficiency
Symptom
Spa will not power on at all; no lights on control panel, no pump activity.
No Power / Dead Spa
Symptom
Topside control panel display is blank or very dim, but pumps may still operate via service mode.
Display / Topside Power Fault
Symptom
Water is leaking from around the jet bodies inside the spa shell.
Jet Body or Gasket Leak
Symptom
Water temperature fluctuates widely or does not match the set temperature.
Temperature Regulation / Calibration Issue
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| COL |
Display shows COL and spa enters a cool or protection mode; heating may be limited.
|
Cold Water Protection / Freeze Mode Indication | View Details |
| DR |
Display shows DR and heater is disabled; spa may think it is running dry.
|
Dry Fire Protection / Low Water in Heater | View Details |
| DRY |
Display shows DRY and spa immediately shuts down heater to prevent damage.
|
Severe Dry Fire Condition | View Details |
| EC |
Display shows EC or ECO and spa heats less frequently; temperature may drop between cycles.
|
Economy Heating Mode Indication | View Details |
| F1 |
Control panel displays F1 and spa functions are disabled or intermittent; keypad may beep randomly.
|
Keypad / Topside Control Panel Communication Fault | View Details |
| F2 |
Display shows F2 and heater does not operate; circulation pump may still run.
|
Water Temperature Sensor (Thermistor) Fault | View Details |
| F3 |
Control panel shows F3 and spa may overheat or not heat correctly; heater is disabled.
|
High-Limit Temperature Sensor Fault | View Details |
| F4 |
Display shows F4 and heater will not engage; spa may run pumps but not heat.
|
Heater Relay or Heater Circuit Failure | View Details |
| F5 |
Control panel shows F5 and jets may not respond correctly; pump speeds may be locked or unavailable.
|
Pump 1 Control / Relay Fault | View Details |
| F6 |
Display shows F6 and secondary pump or blower does not operate when commanded.
|
Auxiliary Pump / Blower Output Fault | View Details |
| F7 |
Control panel shows F7 and spa may shut down or run erratically; often related to power input issues.
|
Input Power / Line Voltage Fault | View Details |
| F8 |
Display shows F8 and spa may not respond to button presses; random resets or lockups occur.
|
Control System Internal Error | View Details |
| F9 |
Control panel shows F9 and spa may shut down heating and pumps intermittently.
|
Overcurrent / System Protection Fault | View Details |
| FLC |
Display shows FLC (flow closed) even when pumps are off; heater may not operate correctly.
|
Flow Switch Stuck Closed | View Details |
| FLO |
Display shows FLO and heater will not turn on; circulation appears weak or absent.
|
Insufficient Water Flow / Flow Switch Open | View Details |
| HL |
Display shows HL and spa shuts down heater; pumps may continue to run.
|
High-Limit Trip / Overheat Protection | View Details |
| ICE |
Display shows ICE and spa automatically runs pumps to prevent freezing; user control may be limited.
|
Freeze Protection Mode Active | View Details |
| LOC |
Display shows LOC and buttons do not respond; spa appears locked.
|
Panel Lock / Child Lock Activated | View Details |
| OH |
Display shows OH and spa shuts down pumps and heater; water feels excessively hot.
|
Overheat Condition Detected | View Details |
| P1 |
Display shows P1 and spa may not heat; circulation appears weak or intermittent.
|
Primary Circulation Pump Fault | View Details |
| P2 |
Display shows P2 and one of the jet pumps does not start or shuts off quickly.
|
Secondary Jet Pump Fault | View Details |
| SE |
Display shows SE or SENSOR and spa may shut down heating.
|
General Sensor Error | View Details |
| SN1 |
Display shows SN1 and spa may not heat; temperature reading may be erratic.
|
Primary Temperature Sensor Error | View Details |
| SN2 |
Display shows SN2 and spa may shut down heater; high-limit protection may be compromised.
|
High-Limit Sensor Error | View Details |
| – |
Buttons on the topside control panel are unresponsive or trigger the wrong functions.
|
Keypad Matrix / Button Failure | View Details |
| – |
Cover lifter area or cabinet smells strongly of burning plastic or electrical smoke.
|
Overheating Electrical Component | View Details |
| – |
LED lighting in the spa is flickering, partially out, or not responding to color changes.
|
LED Lighting System Fault | View Details |
| – |
Ozone indicator is on but no bubbles appear from the ozone injector.
|
Ozonator or Injector Failure | View Details |
| – |
Spa is leaking water inside the equipment bay; puddles form under the spa.
|
Internal Plumbing or Component Leak | View Details |
| – |
Spa jets are weak even with pumps on high speed.
|
Reduced Jet Pressure / Flow Restriction | View Details |
| – |
Spa makes loud grinding or screeching noises from the pump area when jets are on.
|
Pump Bearing or Motor Failure | View Details |
| – |
Spa powers on but will not heat; temperature remains below setpoint despite long run times.
|
No Heat Condition | View Details |
| – |
Spa trips the GFCI/RCD immediately or shortly after turning on.
|
Ground Fault / Electrical Leakage | View Details |
| – |
Spa vibrates excessively or makes banging noises when jets are on.
|
Hydraulic Imbalance / Pump or Jet Vibration | View Details |
| – |
Spa water is cloudy, foamy, or has a strong odor despite filtration.
|
Water Quality / Filtration Inefficiency | View Details |
| – |
Spa will not power on at all; no lights on control panel, no pump activity.
|
No Power / Dead Spa | View Details |
| – |
Topside control panel display is blank or very dim, but pumps may still operate via service mode.
|
Display / Topside Power Fault | View Details |
| – |
Water is leaking from around the jet bodies inside the spa shell.
|
Jet Body or Gasket Leak | View Details |
| – |
Water temperature fluctuates widely or does not match the set temperature.
|
Temperature Regulation / Calibration Issue | View Details |
No matching codes found
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