Evolution Spas
Evolution 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 stops heating and may run pumps to circulate water.
Low Water Temperature Protection / Cold Condition
dr
Display shows dr or DR, spa may shut down heater and pumps intermittently.
Dry Heater or Inadequate Water in Heater Tube
dy
Display shows dy or DRY, spa shuts down heater and may display error repeatedly.
Confirmed Dry Heater Condition
EC
Display shows EC or ECON, spa heats only during filtration cycles and may not reach set temperature quickly.
Economy Heating Mode Enabled
Er1
Display shows Er1 or ERR1, spa may not respond to keypad inputs.
Topside Control Panel Communication Error
Er2
Display shows Er2 or ERR2, spa may not heat or may shut down unexpectedly.
Internal Control Pack Error or Configuration Fault
FL1
Display shows FL1, heater is disabled, jets may still operate but spa will not heat.
Open Flow Switch / Insufficient Flow
FL2
Display shows FL2, spa may not heat and may shut down intermittently.
Flow Switch Stuck Closed or Shorted
FLO
Control panel displays FLO or FL, jets may not run, heater will not turn on, and the spa may shut down after a short period.
Low or No Water Flow Through Heater Circuit
GFCI
GFCI indicator on panel or breaker trips repeatedly when spa tries to run.
Ground Fault or Leakage Current Detected
HL
Display shows HL or HLo, spa stops heating and may disable pumps until reset.
High-Limit Sensor Trip / Over-Temperature at Heater
Htr
Display shows HTR or HEAT ERR, spa does not heat even though pumps run normally.
Heater Circuit Failure
ICE
Display shows ICE or IC, pumps may run automatically even when spa is not in use.
Freeze Protection Mode Active
LOC
Display shows LOC or a lock icon, buttons do not respond to presses.
Control Panel Lock / Keypad Lockout
OH
Display shows OH or OHH, spa shuts down, pumps may run briefly then stop, water feels excessively hot near heater outlet.
Overheat Condition Detected by High-Limit Sensor
PF
Display shows PF or PFL, spa may reset unexpectedly or lose settings.
Power Failure or Low Line Voltage Detected
Prr
Display shows PRR or Prr, spa may not heat and may disable pumps intermittently.
Pressure Switch or Flow Verification Error
PSc
Display shows PSc, spa may not start heating cycle properly.
Pressure Switch Closed When It Should Be Open
PSo
Display shows PS or PSo, spa may not heat and may shut down pumps.
Pressure Switch Open When It Should Be Closed
SE
Display shows SE or SEn, spa may behave erratically or shut down.
Sensor Error or Sensor Out of Range
SL
Display shows SL or SLP, spa maintains a lower temperature and heats primarily during filter cycles.
Sleep Mode Enabled
Sn1
Display shows Sn1 or SN1, spa may not heat or may shut down intermittently.
Water Temperature Sensor (Thermistor) Fault
Sn2
Display shows Sn2 or SN2, spa may shut down heating and display error continuously.
High-Limit or Secondary Temperature Sensor Fault
U1
Display shows U1 or U, pump 1 does not respond correctly to button presses.
Pump 1 Control or Relay Fault
U2
Display shows U2, pump 2 does not operate or behaves erratically.
Pump 2 Control or Relay Fault
Symptom
Air controls on the spa top rail do not change jet intensity when turned.
Non-Functional Air Venturi System
Symptom
Jet pump runs but no water comes out of the jets after refilling the spa.
Air-Locked Jet Pump
Symptom
Jets are weak or there is very little water pressure from the Evolution Spas jets.
Reduced Jet Flow / Hydraulic Restriction
Symptom
Loud grinding or screeching noise from the Evolution Spas jet pump when running.
Pump Motor Bearing Failure
Symptom
Ozonator indicator is on but there is no visible ozone bubbles in the spa.
Ozonator or Injector Failure
Symptom
Rattling or vibrating noise from under the spa when pumps are running.
Vibration or Loose Mounting Hardware
Symptom
Spa cover is excessively heavy and waterlogged, difficult to lift.
Waterlogged Spa Cover
Symptom
Spa does not heat, water stays at or near ambient temperature even though pumps run and no error code is displayed.
No Heat Without Error Code
Symptom
Spa is leaking water from under the cabinet or around the equipment bay.
Plumbing or Component Water Leak
Symptom
Spa lights do not turn on, but all other functions work normally.
LED Lighting Circuit Failure
Symptom
Spa trips the GFCI breaker as soon as jets or heater are turned on.
Component Ground Fault Under Load
Symptom
Spa water has a persistent musty or moldy odor despite chemical treatment.
Biofilm and Organic Contamination in Plumbing
Symptom
Spa water has a strong burning or electrical smell coming from the equipment bay.
Overheating Electrical Component
Symptom
Spa will not power on at all, no lights or display on Evolution Spas control panel.
No Power / Dead Spa
Symptom
Topside control buttons are unresponsive or only work intermittently.
Keypad Membrane or Cable Failure
Symptom
Water is leaking from around one or more jets in the Evolution Spa shell.
Jet Body or Gasket Leak
Symptom
Water temperature overshoots the set point by several degrees before shutting off.
Temperature Overshoot / Sensor Calibration Drift
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| COL |
Display shows COL or COOL, spa stops heating and may run pumps to circulate water.
|
Low Water Temperature Protection / Cold Condition | View Details |
| dr |
Display shows dr or DR, spa may shut down heater and pumps intermittently.
|
Dry Heater or Inadequate Water in Heater Tube | View Details |
| dy |
Display shows dy or DRY, spa shuts down heater and may display error repeatedly.
|
Confirmed Dry Heater Condition | View Details |
| EC |
Display shows EC or ECON, spa heats only during filtration cycles and may not reach set temperature quickly.
|
Economy Heating Mode Enabled | View Details |
| Er1 |
Display shows Er1 or ERR1, spa may not respond to keypad inputs.
|
Topside Control Panel Communication Error | View Details |
| Er2 |
Display shows Er2 or ERR2, spa may not heat or may shut down unexpectedly.
|
Internal Control Pack Error or Configuration Fault | View Details |
| FL1 |
Display shows FL1, heater is disabled, jets may still operate but spa will not heat.
|
Open Flow Switch / Insufficient Flow | View Details |
| FL2 |
Display shows FL2, spa may not heat and may shut down intermittently.
|
Flow Switch Stuck Closed or Shorted | View Details |
| FLO |
Control panel displays FLO or FL, jets may not run, heater will not turn on, and the spa may shut down after a short period.
|
Low or No Water Flow Through Heater Circuit | View Details |
| GFCI |
GFCI indicator on panel or breaker trips repeatedly when spa tries to run.
|
Ground Fault or Leakage Current Detected | View Details |
| HL |
Display shows HL or HLo, spa stops heating and may disable pumps until reset.
|
High-Limit Sensor Trip / Over-Temperature at Heater | View Details |
| Htr |
Display shows HTR or HEAT ERR, spa does not heat even though pumps run normally.
|
Heater Circuit Failure | View Details |
| ICE |
Display shows ICE or IC, pumps may run automatically even when spa is not in use.
|
Freeze Protection Mode Active | View Details |
| LOC |
Display shows LOC or a lock icon, buttons do not respond to presses.
|
Control Panel Lock / Keypad Lockout | View Details |
| OH |
Display shows OH or OHH, spa shuts down, pumps may run briefly then stop, water feels excessively hot near heater outlet.
|
Overheat Condition Detected by High-Limit Sensor | View Details |
| PF |
Display shows PF or PFL, spa may reset unexpectedly or lose settings.
|
Power Failure or Low Line Voltage Detected | View Details |
| Prr |
Display shows PRR or Prr, spa may not heat and may disable pumps intermittently.
|
Pressure Switch or Flow Verification Error | View Details |
| PSc |
Display shows PSc, spa may not start heating cycle properly.
|
Pressure Switch Closed When It Should Be Open | View Details |
| PSo |
Display shows PS or PSo, spa may not heat and may shut down pumps.
|
Pressure Switch Open When It Should Be Closed | View Details |
| SE |
Display shows SE or SEn, spa may behave erratically or shut down.
|
Sensor Error or Sensor Out of Range | View Details |
| SL |
Display shows SL or SLP, spa maintains a lower temperature and heats primarily during filter cycles.
|
Sleep Mode Enabled | View Details |
| Sn1 |
Display shows Sn1 or SN1, spa may not heat or may shut down intermittently.
|
Water Temperature Sensor (Thermistor) Fault | View Details |
| Sn2 |
Display shows Sn2 or SN2, spa may shut down heating and display error continuously.
|
High-Limit or Secondary Temperature Sensor Fault | View Details |
| U1 |
Display shows U1 or U, pump 1 does not respond correctly to button presses.
|
Pump 1 Control or Relay Fault | View Details |
| U2 |
Display shows U2, pump 2 does not operate or behaves erratically.
|
Pump 2 Control or Relay Fault | View Details |
| – |
Air controls on the spa top rail do not change jet intensity when turned.
|
Non-Functional Air Venturi System | View Details |
| – |
Jet pump runs but no water comes out of the jets after refilling the spa.
|
Air-Locked Jet Pump | View Details |
| – |
Jets are weak or there is very little water pressure from the Evolution Spas jets.
|
Reduced Jet Flow / Hydraulic Restriction | View Details |
| – |
Loud grinding or screeching noise from the Evolution Spas jet pump when running.
|
Pump Motor Bearing Failure | View Details |
| – |
Ozonator indicator is on but there is no visible ozone bubbles in the spa.
|
Ozonator or Injector Failure | View Details |
| – |
Rattling or vibrating noise from under the spa when pumps are running.
|
Vibration or Loose Mounting Hardware | View Details |
| – |
Spa cover is excessively heavy and waterlogged, difficult to lift.
|
Waterlogged Spa Cover | View Details |
| – |
Spa does not heat, water stays at or near ambient temperature even though pumps run and no error code is displayed.
|
No Heat Without Error Code | View Details |
| – |
Spa is leaking water from under the cabinet or around the equipment bay.
|
Plumbing or Component Water Leak | View Details |
| – |
Spa lights do not turn on, but all other functions work normally.
|
LED Lighting Circuit Failure | View Details |
| – |
Spa trips the GFCI breaker as soon as jets or heater are turned on.
|
Component Ground Fault Under Load | View Details |
| – |
Spa water has a persistent musty or moldy odor despite chemical treatment.
|
Biofilm and Organic Contamination in Plumbing | View Details |
| – |
Spa water has a strong burning or electrical smell coming from the equipment bay.
|
Overheating Electrical Component | View Details |
| – |
Spa will not power on at all, no lights or display on Evolution Spas control panel.
|
No Power / Dead Spa | View Details |
| – |
Topside control buttons are unresponsive or only work intermittently.
|
Keypad Membrane or Cable Failure | View Details |
| – |
Water is leaking from around one or more jets in the Evolution Spa shell.
|
Jet Body or Gasket Leak | View Details |
| – |
Water temperature overshoots the set point by several degrees before shutting off.
|
Temperature Overshoot / Sensor Calibration Drift | View Details |
No matching codes found
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