Hydropool
Hydropool 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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AOH
Display shows AOH (Ambient Overheat); spa may shut down or limit functions.
Ambient Overheat in Equipment Bay
CF
Display shows CF or CLn; reminder to clean or change filter; spa otherwise operates normally.
Filter Maintenance Reminder
COL
Display shows COL or COOL; heater may run continuously until set temperature is reached.
Cold Water Protection / Low Temperature Condition
dr
Display shows dr or DR; spa may attempt to run but heater is disabled.
Low Water or Flow Detected at Heater
dY
Display shows DY or DRY; heater is disabled and spa may not heat.
Dry-Fire Protection / No Water in Heater
FL1
Display shows FL1, spa does not heat and may shut down the heater circuit.
Open Flow Switch Circuit
FL2
Display shows FL2 and the heater is disabled; spa may run pumps but will not heat.
Flow Switch Closed When It Should Be Open
FLO
Topside control shows FLO or FL1 and the hot tub will not heat; pump may run briefly then stop.
Insufficient Water Flow Through Heater
HL
Display shows HL and spa stops heating; pumps may continue to run in protection mode.
High-Limit Trip Due to Localized Overheating
Htr
Display shows HTR or HEATER FAIL; water does not heat even though pumps run.
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 LOCK; buttons on the topside control are unresponsive.
Panel Lock / Child Lock Activated
OH
Display shows OH or OHH and the spa shuts down; water may feel excessively hot near the heater outlet.
Overheat Condition Detected by High-Limit Sensor
P1
Display shows P1 error; Pump 1 does not start or runs erratically.
Pump 1 Circuit or Motor Fault
P2
Display shows P2 error; Pump 2 does not respond to button presses.
Pump 2 Circuit or Motor Fault
Prr
Display shows PRR or Prr and spa may not heat; pumps may still operate.
Heater Relay or Power Relay Fault
rE
Display shows rE or RESET; spa may be in a startup or configuration error state.
Control System Reset or Configuration Error
SE
Display shows SE or SENSOR; spa may shut down heating and enter protection mode.
General Sensor Error or Sensor Mismatch
Sn1
Display shows Sn1 or SN1 and the spa may not heat or may shut down.
Water Temperature Sensor (Primary) Fault
Sn2
Display shows Sn2 or SN2; spa may operate but with limited heating or safety lockout.
High-Limit or Secondary Temperature Sensor Fault
Symptom
Air blower (if equipped) does not turn on or shuts off quickly.
Air Blower Motor or Circuit Failure
Symptom
Buttons on the topside control are unresponsive or trigger the wrong functions.
Keypad Matrix Failure or Moisture Damage
Symptom
Jets are weak or have very little pressure even when pumps are on high speed.
Reduced Jet Flow / Hydraulic Restriction
Symptom
LED lights in the spa do not work or some colors are missing.
LED Lighting Circuit or Module Failure
Symptom
One or more jets do not work at all while others are strong.
Individual Jet Blockage or Diverter Misposition
Symptom
Ozone generator is not operating; no ozone bubbles visible at the ozone jet.
Ozone System Failure
Symptom
Spa cabinet panels are warped or rotting; insulation may be wet.
Cabinet and Structural Moisture Damage
Symptom
Spa cover is heavy, waterlogged, and difficult to open; heat loss is noticeable.
Waterlogged Insulated Cover
Symptom
Spa is leaking water inside the cabinet; water collects in the base or equipment bay.
Internal Plumbing or Component Leak
Symptom
Spa makes a high-pitched whine or grinding noise from the pump area during operation.
Worn Pump Bearings or Cavitation
Symptom
Spa makes a loud humming noise but the pump does not start; jets do not move water.
Seized Pump Motor or Failed Start Capacitor
Symptom
Spa powers on but will not heat; water temperature remains far below setpoint with no error code displayed.
No Heat Without Error Indication
Symptom
Spa trips the GFCI breaker immediately or within a few seconds of turning it on.
Ground Fault or Short Circuit in Spa Components
Symptom
Spa water is cloudy even though jets and pumps work normally.
Suspended Particles / Poor Filtration
Symptom
Spa water is foamy and has a strong chemical or musty odor.
Water Chemistry Imbalance / Contamination
Symptom
Spa will not power on at all; topside display is blank and no pumps run.
No Power to Hydropool Spa System
Symptom
Topside control panel display is dim, flickering, or unreadable, but spa still runs.
Topside Control Panel Degradation
Symptom
Water is leaking from around the pump area specifically.
Pump Union or Shaft Seal Leak
Symptom
Water temperature fluctuates widely or overshoots the set temperature.
Temperature Regulation Instability
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| AOH |
Display shows AOH (Ambient Overheat); spa may shut down or limit functions.
|
Ambient Overheat in Equipment Bay | View Details |
| CF |
Display shows CF or CLn; reminder to clean or change filter; spa otherwise operates normally.
|
Filter Maintenance Reminder | View Details |
| COL |
Display shows COL or COOL; heater may run continuously until set temperature is reached.
|
Cold Water Protection / Low Temperature Condition | View Details |
| dr |
Display shows dr or DR; spa may attempt to run but heater is disabled.
|
Low Water or Flow Detected at Heater | View Details |
| dY |
Display shows DY or DRY; heater is disabled and spa may not heat.
|
Dry-Fire Protection / No Water in Heater | View Details |
| FL1 |
Display shows FL1, spa does not heat and may shut down the heater circuit.
|
Open Flow Switch Circuit | View Details |
| FL2 |
Display shows FL2 and the heater is disabled; spa may run pumps but will not heat.
|
Flow Switch Closed When It Should Be Open | View Details |
| FLO |
Topside control shows FLO or FL1 and the hot tub will not heat; pump may run briefly then stop.
|
Insufficient Water Flow Through Heater | View Details |
| HL |
Display shows HL and spa stops heating; pumps may continue to run in protection mode.
|
High-Limit Trip Due to Localized Overheating | View Details |
| Htr |
Display shows HTR or HEATER FAIL; water does not heat even though pumps run.
|
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 LOCK; buttons on the topside control are unresponsive.
|
Panel Lock / Child Lock Activated | View Details |
| OH |
Display shows OH or OHH and the spa shuts down; water may feel excessively hot near the heater outlet.
|
Overheat Condition Detected by High-Limit Sensor | View Details |
| P1 |
Display shows P1 error; Pump 1 does not start or runs erratically.
|
Pump 1 Circuit or Motor Fault | View Details |
| P2 |
Display shows P2 error; Pump 2 does not respond to button presses.
|
Pump 2 Circuit or Motor Fault | View Details |
| Prr |
Display shows PRR or Prr and spa may not heat; pumps may still operate.
|
Heater Relay or Power Relay Fault | View Details |
| rE |
Display shows rE or RESET; spa may be in a startup or configuration error state.
|
Control System Reset or Configuration Error | View Details |
| SE |
Display shows SE or SENSOR; spa may shut down heating and enter protection mode.
|
General Sensor Error or Sensor Mismatch | View Details |
| Sn1 |
Display shows Sn1 or SN1 and the spa may not heat or may shut down.
|
Water Temperature Sensor (Primary) Fault | View Details |
| Sn2 |
Display shows Sn2 or SN2; spa may operate but with limited heating or safety lockout.
|
High-Limit or Secondary Temperature Sensor Fault | View Details |
| – |
Air blower (if equipped) does not turn on or shuts off quickly.
|
Air Blower Motor or Circuit Failure | View Details |
| – |
Buttons on the topside control are unresponsive or trigger the wrong functions.
|
Keypad Matrix Failure or Moisture Damage | View Details |
| – |
Jets are weak or have very little pressure even when pumps are on high speed.
|
Reduced Jet Flow / Hydraulic Restriction | View Details |
| – |
LED lights in the spa do not work or some colors are missing.
|
LED Lighting Circuit or Module Failure | View Details |
| – |
One or more jets do not work at all while others are strong.
|
Individual Jet Blockage or Diverter Misposition | View Details |
| – |
Ozone generator is not operating; no ozone bubbles visible at the ozone jet.
|
Ozone System Failure | View Details |
| – |
Spa cabinet panels are warped or rotting; insulation may be wet.
|
Cabinet and Structural Moisture Damage | View Details |
| – |
Spa cover is heavy, waterlogged, and difficult to open; heat loss is noticeable.
|
Waterlogged Insulated Cover | View Details |
| – |
Spa is leaking water inside the cabinet; water collects in the base or equipment bay.
|
Internal Plumbing or Component Leak | View Details |
| – |
Spa makes a high-pitched whine or grinding noise from the pump area during operation.
|
Worn Pump Bearings or Cavitation | View Details |
| – |
Spa makes a loud humming noise but the pump does not start; jets do not move water.
|
Seized Pump Motor or Failed Start Capacitor | View Details |
| – |
Spa powers on but will not heat; water temperature remains far below setpoint with no error code displayed.
|
No Heat Without Error Indication | View Details |
| – |
Spa trips the GFCI breaker immediately or within a few seconds of turning it on.
|
Ground Fault or Short Circuit in Spa Components | View Details |
| – |
Spa water is cloudy even though jets and pumps work normally.
|
Suspended Particles / Poor Filtration | View Details |
| – |
Spa water is foamy and has a strong chemical or musty odor.
|
Water Chemistry Imbalance / Contamination | View Details |
| – |
Spa will not power on at all; topside display is blank and no pumps run.
|
No Power to Hydropool Spa System | View Details |
| – |
Topside control panel display is dim, flickering, or unreadable, but spa still runs.
|
Topside Control Panel Degradation | View Details |
| – |
Water is leaking from around the pump area specifically.
|
Pump Union or Shaft Seal Leak | View Details |
| – |
Water temperature fluctuates widely or overshoots the set temperature.
|
Temperature Regulation Instability | View Details |
No matching codes found
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