Artesian Spas
Artesian 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
The display shows 'COOL', and the spa will not heat to the set temperature immediately after a refill or long standby.
Cool Water Protection / Gradual Heat-Up Mode
dr
The display shows 'dr' or 'DR', and the heater is disabled; the spa may not reach the set temperature.
Dry Heater / Low Water in Heater Manifold
dy
The display shows 'dy' or 'DY', and the spa shuts down the heating cycle.
Dry Fire Protection / Heater Over-Temperature Without Flow
Err
Display shows Err or ERROR, and spa functions are disabled.
General Control System Fault
FLC
The display shows 'FLC' or 'FL2', and the spa may heat erratically or shut down.
Flow Switch Closed When It Should Be Open
FLO
The display shows 'FLO' or 'FL1', and the heater will not run; it may show intermittent heating.
Insufficient Water Flow / Flow Switch Open
HL
The display shows 'HL' or 'HLo', and the spa shuts down or disables the heater.
High-Limit Trip / Localized Overheat
ICE
The display shows 'ICE' or 'IC', and pumps run automatically even when the spa is not in use.
Freeze Protection Mode Active
LOC
Display shows LOC or a lock icon, and buttons do not respond.
Control Panel Lock / Keypad Lockout
Lt
Display shows Lt or LITE error, and spa lights do not work.
Lighting Circuit Fault
O3
Display shows O3 or OZN error, and the ozone indicator does not light.
Ozone Generator Fault
OH
The display shows 'OH' or 'OHH', and the spa shuts down; pumps may run briefly then stop.
Overheat Condition Detected
P1
Display shows P1 error, and Pump 1 will not run or trips the breaker.
Pump 1 Overcurrent or Communication Fault
P2
Display shows P2 error, and Pump 2 will not run or trips the breaker.
Pump 2 Overcurrent or Communication Fault
P3
Display shows P3 error, and Pump 3 does not operate.
Pump 3 Overcurrent or Control Output Fault
Prr
Display shows PRR or PR, and pumps run in a sequence when power is applied.
Priming Mode / Pump Priming Routine
PSoC
Display shows PSOC or PS, and pumps will not start.
Pressure Switch Open Circuit (for older pressure-switch systems)
Sn1
The control panel displays 'Sn1', and the spa will not heat or shows dashes for the temperature.
Primary Temperature Sensor (Thermistor) Failure
Sn2
The control panel displays 'Sn2', and the spa may not heat or may shut down.
High-Limit Temperature Sensor Failure
— —
Display shows two dashes or a blank temperature reading; spa may not heat.
Temperature Not Available / Sensor Out of Range
Symptom
Circulation pump is not running; water at the heater return is still, and the spa may show FLO/HL errors.
Circulation Pump Failure
Symptom
Jets are weak, or some seats have very low water pressure.
Reduced Jet Flow / Hydraulic Restriction
Symptom
One or more pumps do not start; pressing the Jets button only causes a click or hum.
Pump Fails to Start / Seized Motor
Symptom
Some buttons on the topside control panel do not respond or activate incorrect functions.
Keypad Matrix Failure / Water-Damaged Membrane
Symptom
Spa is leaking water inside the equipment bay.
Internal Plumbing or Component Leak
Symptom
Spa lights do not turn on, or only some LEDs work; no specific error code is displayed.
LED Lighting Failure
Symptom
Spa trips the GFCI breaker immediately or within a few seconds of turning on.
Ground Fault or Short Circuit
Symptom
Spa water has a strong burnt plastic or electrical smell from the equipment area.
Overheating Electrical Component
Symptom
Spa water has a strong musty or moldy odor despite normal sanitizer levels.
Biofilm and Contaminant Build-Up in Plumbing
Symptom
Spa will not heat; water stays cold even though pumps run and the set temperature is higher than the actual temperature.
No Heat Condition
Symptom
The spa cabinet or shell vibrates excessively when the jets are on high speed.
Excessive Vibration / Imbalanced Pump or Loose Structure
Symptom
The spa cover is excessively heavy and waterlogged, making it difficult to open and close.
Waterlogged Spa Cover
Symptom
The spa makes loud banging or knocking noises when the pumps run.
Hydraulic Hammer / Cavitation / Loose Components
Symptom
The topside control panel is blank or unreadable, but the spa has power.
Topside Control Panel Failure
Symptom
Water is foamy even with normal sanitizer levels.
Foaming Due to Contaminants
Symptom
Water is leaking from around one or more jets in the shell.
Jet Body or Gasket Leak
Symptom
Water is not circulating through the filter area; the surface remains still during filtration cycles.
Filtration Flow Loss
Symptom
Water temperature overshoots the setpoint by several degrees before the heater shuts off.
Temperature Overshoot / Sensor Calibration Drift
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| COOL |
The display shows 'COOL', and the spa will not heat to the set temperature immediately after a refill or long standby.
|
Cool Water Protection / Gradual Heat-Up Mode | View Details |
| dr |
The display shows 'dr' or 'DR', and the heater is disabled; the spa may not reach the set temperature.
|
Dry Heater / Low Water in Heater Manifold | View Details |
| dy |
The display shows 'dy' or 'DY', and the spa shuts down the heating cycle.
|
Dry Fire Protection / Heater Over-Temperature Without Flow | View Details |
| Err |
Display shows Err or ERROR, and spa functions are disabled.
|
General Control System Fault | View Details |
| FLC |
The display shows 'FLC' or 'FL2', and the spa may heat erratically or shut down.
|
Flow Switch Closed When It Should Be Open | View Details |
| FLO |
The display shows 'FLO' or 'FL1', and the heater will not run; it may show intermittent heating.
|
Insufficient Water Flow / Flow Switch Open | View Details |
| HL |
The display shows 'HL' or 'HLo', and the spa shuts down or disables the heater.
|
High-Limit Trip / Localized Overheat | View Details |
| ICE |
The display shows 'ICE' or 'IC', and pumps run automatically even when the spa is not in use.
|
Freeze Protection Mode Active | View Details |
| LOC |
Display shows LOC or a lock icon, and buttons do not respond.
|
Control Panel Lock / Keypad Lockout | View Details |
| Lt |
Display shows Lt or LITE error, and spa lights do not work.
|
Lighting Circuit Fault | View Details |
| O3 |
Display shows O3 or OZN error, and the ozone indicator does not light.
|
Ozone Generator Fault | View Details |
| OH |
The display shows 'OH' or 'OHH', and the spa shuts down; pumps may run briefly then stop.
|
Overheat Condition Detected | View Details |
| P1 |
Display shows P1 error, and Pump 1 will not run or trips the breaker.
|
Pump 1 Overcurrent or Communication Fault | View Details |
| P2 |
Display shows P2 error, and Pump 2 will not run or trips the breaker.
|
Pump 2 Overcurrent or Communication Fault | View Details |
| P3 |
Display shows P3 error, and Pump 3 does not operate.
|
Pump 3 Overcurrent or Control Output Fault | View Details |
| Prr |
Display shows PRR or PR, and pumps run in a sequence when power is applied.
|
Priming Mode / Pump Priming Routine | View Details |
| PSoC |
Display shows PSOC or PS, and pumps will not start.
|
Pressure Switch Open Circuit (for older pressure-switch systems) | View Details |
| Sn1 |
The control panel displays 'Sn1', and the spa will not heat or shows dashes for the temperature.
|
Primary Temperature Sensor (Thermistor) Failure | View Details |
| Sn2 |
The control panel displays 'Sn2', and the spa may not heat or may shut down.
|
High-Limit Temperature Sensor Failure | View Details |
| — — |
Display shows two dashes or a blank temperature reading; spa may not heat.
|
Temperature Not Available / Sensor Out of Range | View Details |
| – |
Circulation pump is not running; water at the heater return is still, and the spa may show FLO/HL errors.
|
Circulation Pump Failure | View Details |
| – |
Jets are weak, or some seats have very low water pressure.
|
Reduced Jet Flow / Hydraulic Restriction | View Details |
| – |
One or more pumps do not start; pressing the Jets button only causes a click or hum.
|
Pump Fails to Start / Seized Motor | View Details |
| – |
Some buttons on the topside control panel do not respond or activate incorrect functions.
|
Keypad Matrix Failure / Water-Damaged Membrane | View Details |
| – |
Spa is leaking water inside the equipment bay.
|
Internal Plumbing or Component Leak | View Details |
| – |
Spa lights do not turn on, or only some LEDs work; no specific error code is displayed.
|
LED Lighting Failure | View Details |
| – |
Spa trips the GFCI breaker immediately or within a few seconds of turning on.
|
Ground Fault or Short Circuit | View Details |
| – |
Spa water has a strong burnt plastic or electrical smell from the equipment area.
|
Overheating Electrical Component | View Details |
| – |
Spa water has a strong musty or moldy odor despite normal sanitizer levels.
|
Biofilm and Contaminant Build-Up in Plumbing | View Details |
| – |
Spa will not heat; water stays cold even though pumps run and the set temperature is higher than the actual temperature.
|
No Heat Condition | View Details |
| – |
The spa cabinet or shell vibrates excessively when the jets are on high speed.
|
Excessive Vibration / Imbalanced Pump or Loose Structure | View Details |
| – |
The spa cover is excessively heavy and waterlogged, making it difficult to open and close.
|
Waterlogged Spa Cover | View Details |
| – |
The spa makes loud banging or knocking noises when the pumps run.
|
Hydraulic Hammer / Cavitation / Loose Components | View Details |
| – |
The topside control panel is blank or unreadable, but the spa has power.
|
Topside Control Panel Failure | View Details |
| – |
Water is foamy even with normal sanitizer levels.
|
Foaming Due to Contaminants | View Details |
| – |
Water is leaking from around one or more jets in the shell.
|
Jet Body or Gasket Leak | View Details |
| – |
Water is not circulating through the filter area; the surface remains still during filtration cycles.
|
Filtration Flow Loss | View Details |
| – |
Water temperature overshoots the setpoint by several degrees before the heater shuts off.
|
Temperature Overshoot / Sensor Calibration Drift | View Details |
No matching codes found
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