Caldera Spas
Caldera Spas Hot Tubs & Spas Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
Advertisements
CF
Display shows a reminder such as “CF” or “CHANGE FILTER”; spa otherwise operates normally.
Filter Maintenance Reminder
CL
Display shows “CL” or “CLEAN” reminder; spa runs normally.
Water Care / Cleaning Reminder
COOL
Display shows “COOL”; spa will not heat to set temperature and may run pumps intermittently.
Water Temperature Below Safe Heating Threshold
dr
Topside control panel displays “dr” and spa will not heat; circulation pump may run briefly then stop.
Dry Fire / Inadequate Water Flow Protection
dy
Topside control panel displays “dy” and spa shuts down heating; may follow a “dr” code.
Dry Heater / Heater Overheat Protection
FLC
Display shows “FLC” (flow closed) even when pump is off; heater may not operate correctly.
Flow Switch Stuck Closed / Shorted
FLO
Display shows “FLO” or “FLO2”; heater does not run and spa will not heat.
Insufficient Water Flow Through Heater / Flow Switch Open
GFCI TRIP
GFCI breaker trips immediately or shortly after turning spa on; no specific code on topside.
Ground Fault / Electrical Leakage
HFL
Display shows “HFL”; spa may shut down heating intermittently.
Heater Flow Low / Heater High-Limit Trip Due to Low Flow
HL
Display shows “HL” or “HIL”; spa shuts down heater and possibly pumps.
High-Limit Trip / Overtemperature at Heater
ICE
Display shows “ICE” or freeze protection icon; pumps may run automatically even when spa is not in use.
Freeze Protection Mode Active
LOC
Display shows “LOC” or lock icon; buttons on topside control are unresponsive.
Panel Lock / Child Lock Activated
OH
Display shows “OH” and spa shuts down; water may feel excessively hot near heater return.
Overheat Condition Detected by High-Limit Sensor
Prr
Display shows a pump-related error (e.g., “P1”, “P2”, or “Prr”) and associated jet pump will not run.
Jet Pump Overload or Failure
SN1
Display shows “SN1” and spa may not heat or may shut down.
Water Temperature Sensor (Thermistor) Fault
SN2
Display shows “SN2” and spa may shut down or stop heating.
High-Limit Temperature Sensor Fault
— —
Display shows dashes or is blank with only backlight; spa does not respond to button presses.
Topside Control Communication Failure
Symptom
Air bubbles or gurgling sounds are heard in the plumbing; jets may sputter.
Air Ingress / Air Lock
Symptom
Cabinet panels are warped, rotting, or separating from the frame.
Cabinet Structural Degradation
Symptom
Jets are weak or some seats have very little water pressure.
Reduced Jet Flow / Hydraulic Restriction
Symptom
Jets do not work; pressing jet button does nothing or only a click is heard.
Jet Pump Not Running
Symptom
Ozone indicator is off and no ozone bubbles are visible when the circulation pump runs.
Ozonator Not Operating
Symptom
Spa cover is heavy, waterlogged, and difficult to open; condensation drips from seams.
Waterlogged Insulated Cover
Symptom
Spa heats very slowly or cannot reach set temperature in cold weather.
Insufficient Heating Capacity / Heat Loss
Symptom
Spa is leaking water inside the equipment compartment or from under the cabinet.
Plumbing or Component Leak
Symptom
Spa lights do not turn on, or some LEDs are out while others work.
Lighting Circuit or LED Failure
Symptom
Spa makes loud grinding, squealing, or rattling noises when pumps are running.
Pump Bearing or Cavitation Noise
Symptom
Spa shell has visible cracks or blisters (bubbles) in the acrylic surface.
Shell Surface Damage / Osmotic Blistering
Symptom
Spa trips household breaker (non-GFCI) under heavy load, such as when multiple pumps and heater run.
Overcurrent / Circuit Overload
Symptom
Spa vibrates excessively or makes thumping noises when jets are on.
Mechanical Vibration / Resonance
Symptom
Spa water has a strong burning or electrical smell near the equipment compartment.
Overheating Electrical Component
Symptom
Spa water has little or no sanitizer even though a Caldera FreshWater salt system is installed.
Salt System Underproduction
Symptom
Spa water is cloudy, foamy, or has a strong chemical odor despite normal operation.
Water Quality Imbalance
Symptom
Spa will not heat; water stays at or near ambient temperature even though pumps run and set temperature is high.
Heater Failure / No Heat Condition
Symptom
Spa will not turn on at all; no lights on topside control, no pump activity.
No Power / Dead Spa
Symptom
Topside control buttons are unresponsive or only some buttons work intermittently.
Keypad / Topside Control Failure
Symptom
Water is leaking from around individual jets in the spa shell.
Jet Body or Gasket Leak
Symptom
Water is not circulating when it should; no movement at circulation jet during heating or filtration cycles.
Circulation Pump Failure
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| CF |
Display shows a reminder such as “CF” or “CHANGE FILTER”; spa otherwise operates normally.
|
Filter Maintenance Reminder | View Details |
| CL |
Display shows “CL” or “CLEAN” reminder; spa runs normally.
|
Water Care / Cleaning Reminder | View Details |
| COOL |
Display shows “COOL”; spa will not heat to set temperature and may run pumps intermittently.
|
Water Temperature Below Safe Heating Threshold | View Details |
| dr |
Topside control panel displays “dr” and spa will not heat; circulation pump may run briefly then stop.
|
Dry Fire / Inadequate Water Flow Protection | View Details |
| dy |
Topside control panel displays “dy” and spa shuts down heating; may follow a “dr” code.
|
Dry Heater / Heater Overheat Protection | View Details |
| FLC |
Display shows “FLC” (flow closed) even when pump is off; heater may not operate correctly.
|
Flow Switch Stuck Closed / Shorted | View Details |
| FLO |
Display shows “FLO” or “FLO2”; heater does not run and spa will not heat.
|
Insufficient Water Flow Through Heater / Flow Switch Open | View Details |
| GFCI TRIP |
GFCI breaker trips immediately or shortly after turning spa on; no specific code on topside.
|
Ground Fault / Electrical Leakage | View Details |
| HFL |
Display shows “HFL”; spa may shut down heating intermittently.
|
Heater Flow Low / Heater High-Limit Trip Due to Low Flow | View Details |
| HL |
Display shows “HL” or “HIL”; spa shuts down heater and possibly pumps.
|
High-Limit Trip / Overtemperature at Heater | View Details |
| ICE |
Display shows “ICE” or freeze protection icon; pumps may run automatically even when spa is not in use.
|
Freeze Protection Mode Active | View Details |
| LOC |
Display shows “LOC” or lock icon; buttons on topside control are unresponsive.
|
Panel Lock / Child Lock Activated | View Details |
| OH |
Display shows “OH” and spa shuts down; water may feel excessively hot near heater return.
|
Overheat Condition Detected by High-Limit Sensor | View Details |
| Prr |
Display shows a pump-related error (e.g., “P1”, “P2”, or “Prr”) and associated jet pump will not run.
|
Jet Pump Overload or Failure | View Details |
| SN1 |
Display shows “SN1” and spa may not heat or may shut down.
|
Water Temperature Sensor (Thermistor) Fault | View Details |
| SN2 |
Display shows “SN2” and spa may shut down or stop heating.
|
High-Limit Temperature Sensor Fault | View Details |
| — — |
Display shows dashes or is blank with only backlight; spa does not respond to button presses.
|
Topside Control Communication Failure | View Details |
| – |
Air bubbles or gurgling sounds are heard in the plumbing; jets may sputter.
|
Air Ingress / Air Lock | View Details |
| – |
Cabinet panels are warped, rotting, or separating from the frame.
|
Cabinet Structural Degradation | View Details |
| – |
Jets are weak or some seats have very little water pressure.
|
Reduced Jet Flow / Hydraulic Restriction | View Details |
| – |
Jets do not work; pressing jet button does nothing or only a click is heard.
|
Jet Pump Not Running | View Details |
| – |
Ozone indicator is off and no ozone bubbles are visible when the circulation pump runs.
|
Ozonator Not Operating | View Details |
| – |
Spa cover is heavy, waterlogged, and difficult to open; condensation drips from seams.
|
Waterlogged Insulated Cover | View Details |
| – |
Spa heats very slowly or cannot reach set temperature in cold weather.
|
Insufficient Heating Capacity / Heat Loss | View Details |
| – |
Spa is leaking water inside the equipment compartment or from under the cabinet.
|
Plumbing or Component Leak | View Details |
| – |
Spa lights do not turn on, or some LEDs are out while others work.
|
Lighting Circuit or LED Failure | View Details |
| – |
Spa makes loud grinding, squealing, or rattling noises when pumps are running.
|
Pump Bearing or Cavitation Noise | View Details |
| – |
Spa shell has visible cracks or blisters (bubbles) in the acrylic surface.
|
Shell Surface Damage / Osmotic Blistering | View Details |
| – |
Spa trips household breaker (non-GFCI) under heavy load, such as when multiple pumps and heater run.
|
Overcurrent / Circuit Overload | View Details |
| – |
Spa vibrates excessively or makes thumping noises when jets are on.
|
Mechanical Vibration / Resonance | View Details |
| – |
Spa water has a strong burning or electrical smell near the equipment compartment.
|
Overheating Electrical Component | View Details |
| – |
Spa water has little or no sanitizer even though a Caldera FreshWater salt system is installed.
|
Salt System Underproduction | View Details |
| – |
Spa water is cloudy, foamy, or has a strong chemical odor despite normal operation.
|
Water Quality Imbalance | View Details |
| – |
Spa will not heat; water stays at or near ambient temperature even though pumps run and set temperature is high.
|
Heater Failure / No Heat Condition | View Details |
| – |
Spa will not turn on at all; no lights on topside control, no pump activity.
|
No Power / Dead Spa | View Details |
| – |
Topside control buttons are unresponsive or only some buttons work intermittently.
|
Keypad / Topside Control Failure | View Details |
| – |
Water is leaking from around individual jets in the spa shell.
|
Jet Body or Gasket Leak | View Details |
| – |
Water is not circulating when it should; no movement at circulation jet during heating or filtration cycles.
|
Circulation Pump Failure | View Details |
No matching codes found
Advertisements