Tuff Spas
Tuff 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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COL
Display shows COL or COOL; spa indicates water is too cold and may run pumps but not heater immediately.
Cold Water Protection / Freeze or Cool Condition
dr
Display shows dr or DR and spa shuts down heater; may retry several times before locking out.
Dry Fire / Inadequate Water in Heater
dY
Display shows dY or DY after repeated dr errors; spa locks out heating until reset.
Dry Fire Lockout
EC
Display shows EC or ECON; spa heats less frequently and may not reach set temperature quickly.
Economy Mode Active
FLC
Display shows FLC or FLOC; heater is disabled and spa may cycle pumps trying to clear the fault.
Flow Switch Closed When It Should Be Open
FLO
Display shows FLO or FL and heater will not run; sometimes pump runs continuously at low speed.
Low Water Flow / Flow Switch Open
HL
Display shows HL or HOT and spa shuts down; heater icon may be off but water is very hot near the heater manifold.
High-Limit Sensor Trip
ICE
Display shows ICE or FR; pumps run periodically even when spa is not in use.
Freeze Protection Mode
LOC
Display shows LOC or a lock icon; buttons on the topside control panel do not respond.
Panel Lock / Child Lock Enabled
OH
Control panel displays OH and spa shuts down; water in the tub feels extremely hot, often above the set temperature.
Overheat Protection Trip
OH2
Display shows a secondary overheat code (e.g., OH2 or HOT2); spa shuts down all functions.
Redundant Overheat Trip
PF
Display shows PF or PWR FAIL; spa resets unexpectedly or loses settings.
Power Failure / Voltage Interruption
Prr
Display shows PR, PRR, or PRIMING at startup; pumps may run intermittently and heater is off.
Priming Mode / Air in Plumbing
SE
Display shows SE or SEr; spa may not respond to button presses or may behave erratically.
Sensor or Software Error
Sn1
Display shows Sn1 or SENS1; spa may shut down heater or run erratically.
Primary Temperature Sensor Failure
Sn2
Display shows Sn2 or SENS2; spa may continue to run but with limited heating or safety shutdowns.
Secondary / High-Limit Sensor Failure
— —
Display shows dashes (– –) or blank temperature reading; spa may still run pumps but not heat correctly.
Temperature Not Available / Sensor Out of Range
Symptom
Air bubbles are not coming from the jets even when air controls are open.
Air Induction Failure
Symptom
Buttons on the topside control panel are unresponsive or trigger the wrong functions.
Keypad / Button Matrix Failure
Symptom
Circulation pump is very noisy, rattling, or grinding during operation.
Circulation Pump Bearing or Cavitation Noise
Symptom
Excessive vibration or banging noise when jet pump is running.
Pump Vibration / Mounting Issue
Symptom
Jets are weak or some seats have little to no water pressure.
Reduced Jet Flow
Symptom
LED lights in the spa do not work or some colors are missing.
Spa Lighting Failure
Symptom
Main jet pump hums but does not start; may trip the breaker after a few seconds.
Jet Pump Seized or Start Circuit Failure
Symptom
Ozone or UV sanitizer indicator is off and water quality declines faster than normal.
Sanitizer System Failure
Symptom
Spa cover is heavy, waterlogged, and difficult to open; heat loss is noticeable.
Waterlogged Insulated Cover
Symptom
Spa heats but overshoots the set temperature by several degrees before shutting off.
Temperature Overshoot / Poor Regulation
Symptom
Spa powers on but will not heat; temperature stays well below set point even after many hours.
No Heat Condition
Symptom
Spa trips the GFCI breaker immediately or shortly after turning on.
Ground Fault / Short Circuit
Symptom
Spa water foams excessively when jets are on.
Foaming Water
Symptom
Spa water has a strong chemical or musty odor even with normal sanitizer readings.
Water Odor / Contamination
Symptom
Spa will not power on at all; topside display is blank and no pumps run.
No Power / Dead Spa
Symptom
Strong burning or electrical smell coming from the equipment compartment.
Overheating Electrical Component
Symptom
Topside control panel display is dim, missing segments, or unreadable, but spa still runs.
Topside Display Failure
Symptom
Water around the base of the spa after heavy rain, but water level in spa does not drop.
External Water Intrusion / Not a Spa Leak
Symptom
Water is leaking from the equipment area under the Tuff Spas cabinet.
Equipment Bay Leak
Symptom
Water level in the spa drops noticeably between uses with no visible leak in the equipment bay.
Shell or Plumbing Leak in Foam
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| COL |
Display shows COL or COOL; spa indicates water is too cold and may run pumps but not heater immediately.
|
Cold Water Protection / Freeze or Cool Condition | View Details |
| dr |
Display shows dr or DR and spa shuts down heater; may retry several times before locking out.
|
Dry Fire / Inadequate Water in Heater | View Details |
| dY |
Display shows dY or DY after repeated dr errors; spa locks out heating until reset.
|
Dry Fire Lockout | View Details |
| EC |
Display shows EC or ECON; spa heats less frequently and may not reach set temperature quickly.
|
Economy Mode Active | View Details |
| FLC |
Display shows FLC or FLOC; heater is disabled and spa may cycle pumps trying to clear the fault.
|
Flow Switch Closed When It Should Be Open | View Details |
| FLO |
Display shows FLO or FL and heater will not run; sometimes pump runs continuously at low speed.
|
Low Water Flow / Flow Switch Open | View Details |
| HL |
Display shows HL or HOT and spa shuts down; heater icon may be off but water is very hot near the heater manifold.
|
High-Limit Sensor Trip | View Details |
| ICE |
Display shows ICE or FR; pumps run periodically even when spa is not in use.
|
Freeze Protection Mode | View Details |
| LOC |
Display shows LOC or a lock icon; buttons on the topside control panel do not respond.
|
Panel Lock / Child Lock Enabled | View Details |
| OH |
Control panel displays OH and spa shuts down; water in the tub feels extremely hot, often above the set temperature.
|
Overheat Protection Trip | View Details |
| OH2 |
Display shows a secondary overheat code (e.g., OH2 or HOT2); spa shuts down all functions.
|
Redundant Overheat Trip | View Details |
| PF |
Display shows PF or PWR FAIL; spa resets unexpectedly or loses settings.
|
Power Failure / Voltage Interruption | View Details |
| Prr |
Display shows PR, PRR, or PRIMING at startup; pumps may run intermittently and heater is off.
|
Priming Mode / Air in Plumbing | View Details |
| SE |
Display shows SE or SEr; spa may not respond to button presses or may behave erratically.
|
Sensor or Software Error | View Details |
| Sn1 |
Display shows Sn1 or SENS1; spa may shut down heater or run erratically.
|
Primary Temperature Sensor Failure | View Details |
| Sn2 |
Display shows Sn2 or SENS2; spa may continue to run but with limited heating or safety shutdowns.
|
Secondary / High-Limit Sensor Failure | View Details |
| — — |
Display shows dashes (– –) or blank temperature reading; spa may still run pumps but not heat correctly.
|
Temperature Not Available / Sensor Out of Range | View Details |
| – |
Air bubbles are not coming from the jets even when air controls are open.
|
Air Induction Failure | View Details |
| – |
Buttons on the topside control panel are unresponsive or trigger the wrong functions.
|
Keypad / Button Matrix Failure | View Details |
| – |
Circulation pump is very noisy, rattling, or grinding during operation.
|
Circulation Pump Bearing or Cavitation Noise | View Details |
| – |
Excessive vibration or banging noise when jet pump is running.
|
Pump Vibration / Mounting Issue | View Details |
| – |
Jets are weak or some seats have little to no water pressure.
|
Reduced Jet Flow | View Details |
| – |
LED lights in the spa do not work or some colors are missing.
|
Spa Lighting Failure | View Details |
| – |
Main jet pump hums but does not start; may trip the breaker after a few seconds.
|
Jet Pump Seized or Start Circuit Failure | View Details |
| – |
Ozone or UV sanitizer indicator is off and water quality declines faster than normal.
|
Sanitizer System Failure | View Details |
| – |
Spa cover is heavy, waterlogged, and difficult to open; heat loss is noticeable.
|
Waterlogged Insulated Cover | View Details |
| – |
Spa heats but overshoots the set temperature by several degrees before shutting off.
|
Temperature Overshoot / Poor Regulation | View Details |
| – |
Spa powers on but will not heat; temperature stays well below set point even after many hours.
|
No Heat Condition | View Details |
| – |
Spa trips the GFCI breaker immediately or shortly after turning on.
|
Ground Fault / Short Circuit | View Details |
| – |
Spa water foams excessively when jets are on.
|
Foaming Water | View Details |
| – |
Spa water has a strong chemical or musty odor even with normal sanitizer readings.
|
Water Odor / Contamination | View Details |
| – |
Spa will not power on at all; topside display is blank and no pumps run.
|
No Power / Dead Spa | View Details |
| – |
Strong burning or electrical smell coming from the equipment compartment.
|
Overheating Electrical Component | View Details |
| – |
Topside control panel display is dim, missing segments, or unreadable, but spa still runs.
|
Topside Display Failure | View Details |
| – |
Water around the base of the spa after heavy rain, but water level in spa does not drop.
|
External Water Intrusion / Not a Spa Leak | View Details |
| – |
Water is leaking from the equipment area under the Tuff Spas cabinet.
|
Equipment Bay Leak | View Details |
| – |
Water level in the spa drops noticeably between uses with no visible leak in the equipment bay.
|
Shell or Plumbing Leak in Foam | View Details |
No matching codes found
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