Strong Spas
Strong Spas 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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COOL
Display shows COOL and heating is temporarily suspended
Water Temperature Below Set Threshold / Cool Condition
dr
Display shows dr or DR and spa will not heat; may show intermittent heating attempts
Dry Heater / Low Water in Heater Tube
dy
Display shows dy or DY and spa shuts down heating cycle
Dry Heater Protection / Repeated Dry Condition
EC
Display shows EC or ECO and spa heats less frequently than expected
Energy-Saving / Economy Mode Active
FLC
Display shows FLC or FL2 and heater will not run
Flow Switch Closed When It Should Be Open
FLO
Display shows FLO or FL1 and heater will not run; spa may show "Heating Suspended"
Insufficient Water Flow / Flow Switch Open
HL
Display shows HL or HLt and spa shuts down or limits operation
High-Limit Trip / Localized Overheat
ICE
Display shows ICE or IC and pumps run automatically even when spa is not in use
Freeze Protection Mode Active
LOC
Display shows LOC or lock icon; buttons do not respond
Control Panel Lock / Keypad Lockout
OH
Display shows OH or OHH and spa shuts down, pumps may run briefly then stop
Overheat Condition Detected
PF
Display shows PF or PFL and spa shuts down unexpectedly
Power Failure / Line Voltage Error
Prr
Display shows PRR or PR and pumps run in a sequence; limited control response
Priming Mode / Pump Priming Routine
PSo
Display shows PSO or PS and pump will not start or shuts off quickly
Pump Suction Overload / Dry Pump Protection
SbY
Display shows SbY or SBY and spa appears off but has power
Standby Mode / Maintenance Mode
SE
Display shows SE or SEr and spa functions erratically
Sensor Error / Sensor Out of Range
Sn1
Control panel displays Sn1 and spa will not heat or may shut down
Primary Temperature Sensor (Sensor 1) Failure
Sn2
Control panel displays Sn2 and spa may not heat or may shut down
Secondary Temperature or High-Limit Sensor Failure
— —
Display is blank or shows only dashes; spa has power but no normal readout
Topside Control Communication Failure
Symptom
Blower does not turn on or shuts off quickly after starting
Air Blower Failure or Overheat
Symptom
Circulation pump is noisy, rattling, or running hot
Worn Circulation Pump Bearings or Cavitation
Symptom
Jet pump hums but does not start; may trip breaker after a few seconds
Seized or Locked Pump Motor
Symptom
Jets are weak or some seats have very little water pressure
Reduced Jet Flow / Hydraulic Restriction
Symptom
LED lights do not work or only some colors/functions operate
LED Lighting System Failure
Symptom
Ozone indicator is on but there is no ozone smell or visible bubbles from ozone injector
Ozonator Failure or Injector Blockage
Symptom
Spa cabinet or shell vibrates excessively and makes loud rumbling when jets are on high
Excessive Vibration / Pump Mounting Issue
Symptom
Spa cabinet panels are hot to the touch and internal temperature seems excessive
Overheating Equipment Bay / Ventilation Issue
Symptom
Spa cover is extremely heavy, waterlogged, and difficult to open
Waterlogged Insulated Cover
Symptom
Spa does not heat; water stays cold even though pumps run and no error code is displayed
No Heat Without Error
Symptom
Spa shell has visible cracks or blisters; water may seep from damaged areas
Acrylic Shell Damage
Symptom
Spa trips the GFCI breaker immediately or within seconds of turning on
Ground Fault / Short Circuit
Symptom
Spa water is foamy and has a strong odor despite normal operation
Water Chemistry Imbalance / Contamination
Symptom
Spa will not power on at all; no lights, no display, no pump operation
No Power / Dead Spa
Symptom
Strong chemical or burning plastic smell from equipment bay
Overheating Electrical Component or Pump
Symptom
Topside control buttons are unresponsive or only some buttons work
Keypad Failure or Moisture Intrusion
Symptom
Water is leaking from around individual jets in the spa shell
Jet Body or Gasket Leak
Symptom
Water is leaking from around the light lens or in the footwell area
Spa Light Niche or Lens Leak
Symptom
Water is leaking from the equipment bay under the control pack or heater
Heater Manifold or Plumbing Leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| COOL |
Display shows COOL and heating is temporarily suspended
|
Water Temperature Below Set Threshold / Cool Condition | View Details |
| dr |
Display shows dr or DR and spa will not heat; may show intermittent heating attempts
|
Dry Heater / Low Water in Heater Tube | View Details |
| dy |
Display shows dy or DY and spa shuts down heating cycle
|
Dry Heater Protection / Repeated Dry Condition | View Details |
| EC |
Display shows EC or ECO and spa heats less frequently than expected
|
Energy-Saving / Economy Mode Active | View Details |
| FLC |
Display shows FLC or FL2 and heater will not run
|
Flow Switch Closed When It Should Be Open | View Details |
| FLO |
Display shows FLO or FL1 and heater will not run; spa may show "Heating Suspended"
|
Insufficient Water Flow / Flow Switch Open | View Details |
| HL |
Display shows HL or HLt and spa shuts down or limits operation
|
High-Limit Trip / Localized Overheat | View Details |
| ICE |
Display shows ICE or IC and pumps run automatically even when spa is not in use
|
Freeze Protection Mode Active | View Details |
| LOC |
Display shows LOC or lock icon; buttons do not respond
|
Control Panel Lock / Keypad Lockout | View Details |
| OH |
Display shows OH or OHH and spa shuts down, pumps may run briefly then stop
|
Overheat Condition Detected | View Details |
| PF |
Display shows PF or PFL and spa shuts down unexpectedly
|
Power Failure / Line Voltage Error | View Details |
| Prr |
Display shows PRR or PR and pumps run in a sequence; limited control response
|
Priming Mode / Pump Priming Routine | View Details |
| PSo |
Display shows PSO or PS and pump will not start or shuts off quickly
|
Pump Suction Overload / Dry Pump Protection | View Details |
| SbY |
Display shows SbY or SBY and spa appears off but has power
|
Standby Mode / Maintenance Mode | View Details |
| SE |
Display shows SE or SEr and spa functions erratically
|
Sensor Error / Sensor Out of Range | View Details |
| Sn1 |
Control panel displays Sn1 and spa will not heat or may shut down
|
Primary Temperature Sensor (Sensor 1) Failure | View Details |
| Sn2 |
Control panel displays Sn2 and spa may not heat or may shut down
|
Secondary Temperature or High-Limit Sensor Failure | View Details |
| — — |
Display is blank or shows only dashes; spa has power but no normal readout
|
Topside Control Communication Failure | View Details |
| – |
Blower does not turn on or shuts off quickly after starting
|
Air Blower Failure or Overheat | View Details |
| – |
Circulation pump is noisy, rattling, or running hot
|
Worn Circulation Pump Bearings or Cavitation | View Details |
| – |
Jet pump hums but does not start; may trip breaker after a few seconds
|
Seized or Locked Pump Motor | View Details |
| – |
Jets are weak or some seats have very little water pressure
|
Reduced Jet Flow / Hydraulic Restriction | View Details |
| – |
LED lights do not work or only some colors/functions operate
|
LED Lighting System Failure | View Details |
| – |
Ozone indicator is on but there is no ozone smell or visible bubbles from ozone injector
|
Ozonator Failure or Injector Blockage | View Details |
| – |
Spa cabinet or shell vibrates excessively and makes loud rumbling when jets are on high
|
Excessive Vibration / Pump Mounting Issue | View Details |
| – |
Spa cabinet panels are hot to the touch and internal temperature seems excessive
|
Overheating Equipment Bay / Ventilation Issue | View Details |
| – |
Spa cover is extremely heavy, waterlogged, and difficult to open
|
Waterlogged Insulated Cover | View Details |
| – |
Spa does not heat; water stays cold even though pumps run and no error code is displayed
|
No Heat Without Error | View Details |
| – |
Spa shell has visible cracks or blisters; water may seep from damaged areas
|
Acrylic Shell Damage | View Details |
| – |
Spa trips the GFCI breaker immediately or within seconds of turning on
|
Ground Fault / Short Circuit | View Details |
| – |
Spa water is foamy and has a strong odor despite normal operation
|
Water Chemistry Imbalance / Contamination | View Details |
| – |
Spa will not power on at all; no lights, no display, no pump operation
|
No Power / Dead Spa | View Details |
| – |
Strong chemical or burning plastic smell from equipment bay
|
Overheating Electrical Component or Pump | View Details |
| – |
Topside control buttons are unresponsive or only some buttons work
|
Keypad Failure or Moisture Intrusion | View Details |
| – |
Water is leaking from around individual jets in the spa shell
|
Jet Body or Gasket Leak | View Details |
| – |
Water is leaking from around the light lens or in the footwell area
|
Spa Light Niche or Lens Leak | View Details |
| – |
Water is leaking from the equipment bay under the control pack or heater
|
Heater Manifold or Plumbing Leak | View Details |
No matching codes found
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