Michael Phelps Spas
Michael Phelps 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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BL
Display shows BL or a blower symbol, but the air blower does not run.
Air Blower Failure or Overload
CF
Display shows CF or CLn reminder, prompting for filter cleaning.
Filter Maintenance Reminder (Not a Fault)
COL
Display shows COL, and the heater does not run; the spa is in cold protection mode.
Cold Water Protection / Freeze Protection Active
COOL
Display shows COOL, and the heater is disabled temporarily.
Cool Water Condition / Anti-Ice Mode
dr
Display shows dr or DR, and the heater shuts down; may be accompanied by low heat complaints.
Dry Heater or Low Water in Heater Manifold
dY
Display shows dY or DY after a dr condition; the spa will not heat.
Persistent Dry Heater Lockout
FLC
Display shows FLC or FL2, and the spa may not heat; flow error even when the pump is off.
Flow Switch Closed When It Should Be Open (Shorted or Stuck Flow Switch)
FLO
Display shows FLO or FL1, and the heater will not turn on; may show intermittent flow errors.
Insufficient Water Flow Through Heater / Flow Switch Open
HL
Display shows HL or HLt, and the spa shuts down or limits operation.
High-Limit Trip Due to Localized Overheating
HOT
Display shows HOT, and spa functions are limited; water may feel very warm.
High Temperature Condition (Not Full Overheat Lockout)
IC
Display shows IC or ICE, and pumps run periodically even when the spa is not in use.
Freeze Protection Mode Active
LOC
Display shows LOC or LOCK, and buttons do not respond.
Panel Lock or Child Lock Enabled
Lt
Display shows Lt or LITE error; spa light does not work.
LED Spa Light Circuit Fault
OH
Display shows OH or OHH, and the spa shuts down with pumps off; water feels very hot.
Overheat Condition Detected by High-Limit Sensor
P1
Error or status indicating Pump 1 fault; jets 1 do not run or trip the breaker.
Primary Jet Pump 1 Failure or Overload
P2
Error or status indicating Pump 2 fault; secondary jets do not run.
Secondary Jet Pump 2 Failure or Overload
PF
Display shows PF or PFL, and the spa shuts down unexpectedly, often after a power outage.
Power Failure or Power Fluctuation Detected
Prr
Display shows Prr or PR, and the spa may not operate normally.
Program or Configuration Error in Control Pack
SE
Display shows SE or SEn, and the spa may not heat correctly.
Sensor Error or Sensor Out of Sync
Sn1
Control panel displays Sn1, and the spa will not heat or shows an incorrect water temperature.
Primary Temperature Sensor (Sensor 1) Failure or Out-of-Range
Sn2
Control panel displays Sn2, and the spa may not heat or may shut down.
High-Limit or Secondary Temperature Sensor Failure
— —
Display is blank or shows dashes, and the spa does not respond.
Topside Control Panel Communication Failure
Symptom
Excessive vibration or rattling noise when pumps are running
Pump Mounting or Plumbing Vibration
Symptom
Foamy water and poor jet performance despite normal equipment operation
Water Quality and Surfactant Buildup
Symptom
Jets are weak, or some seats have very low water pressure.
Restricted Water Flow in Jet Plumbing
Symptom
Loud grinding or screeching noise from the pump area when jets are on.
Jet Pump Bearing or Motor Failure
Symptom
Ozone indicator is on, but no bubbles are coming from the ozone injector.
Ozonator or Mazzei Injector Failure
Symptom
Spa does not start at all; no lights on topside, completely dead
No Power to Spa Control Pack
Symptom
Spa heats very slowly or cannot reach set temperature in cold weather
Insufficient Heating Capacity or Heat Loss
Symptom
Spa is leaking water inside the equipment bay or under the cabinet.
Plumbing or Component Leak
Symptom
Spa lights flicker or some LEDs are out in the Michael Phelps Spas lighting system
LED Lighting String or Driver Failure
Symptom
Spa trips the GFCI breaker immediately or within seconds of turning it on.
Ground Fault or Short Circuit in Spa Equipment
Symptom
Spa water is not circulating when in filtration mode; the surface becomes stagnant.
Circulation Pump Not Running
Symptom
Spa will not heat; water stays cold even though pumps run and the set temperature is high.
Heater Element Failure
Symptom
Strong chemical or burning plastic smell from equipment bay
Overheating Electrical Component or Pump
Symptom
Topside control buttons are unresponsive, or some buttons work intermittently.
Keypad / Topside Control Panel Failure
Symptom
Water features (waterfalls, fountains) are weak or not flowing
Water Feature Flow Restriction
Symptom
Water temperature fluctuates widely or does not match set temperature
Temperature Regulation / Sensor Calibration Issue
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| BL |
Display shows BL or a blower symbol, but the air blower does not run.
|
Air Blower Failure or Overload | View Details |
| CF |
Display shows CF or CLn reminder, prompting for filter cleaning.
|
Filter Maintenance Reminder (Not a Fault) | View Details |
| COL |
Display shows COL, and the heater does not run; the spa is in cold protection mode.
|
Cold Water Protection / Freeze Protection Active | View Details |
| COOL |
Display shows COOL, and the heater is disabled temporarily.
|
Cool Water Condition / Anti-Ice Mode | View Details |
| dr |
Display shows dr or DR, and the heater shuts down; may be accompanied by low heat complaints.
|
Dry Heater or Low Water in Heater Manifold | View Details |
| dY |
Display shows dY or DY after a dr condition; the spa will not heat.
|
Persistent Dry Heater Lockout | View Details |
| FLC |
Display shows FLC or FL2, and the spa may not heat; flow error even when the pump is off.
|
Flow Switch Closed When It Should Be Open (Shorted or Stuck Flow Switch) | View Details |
| FLO |
Display shows FLO or FL1, and the heater will not turn on; may show intermittent flow errors.
|
Insufficient Water Flow Through Heater / Flow Switch Open | View Details |
| HL |
Display shows HL or HLt, and the spa shuts down or limits operation.
|
High-Limit Trip Due to Localized Overheating | View Details |
| HOT |
Display shows HOT, and spa functions are limited; water may feel very warm.
|
High Temperature Condition (Not Full Overheat Lockout) | View Details |
| IC |
Display shows IC or ICE, and pumps run periodically even when the spa is not in use.
|
Freeze Protection Mode Active | View Details |
| LOC |
Display shows LOC or LOCK, and buttons do not respond.
|
Panel Lock or Child Lock Enabled | View Details |
| Lt |
Display shows Lt or LITE error; spa light does not work.
|
LED Spa Light Circuit Fault | View Details |
| OH |
Display shows OH or OHH, and the spa shuts down with pumps off; water feels very hot.
|
Overheat Condition Detected by High-Limit Sensor | View Details |
| P1 |
Error or status indicating Pump 1 fault; jets 1 do not run or trip the breaker.
|
Primary Jet Pump 1 Failure or Overload | View Details |
| P2 |
Error or status indicating Pump 2 fault; secondary jets do not run.
|
Secondary Jet Pump 2 Failure or Overload | View Details |
| PF |
Display shows PF or PFL, and the spa shuts down unexpectedly, often after a power outage.
|
Power Failure or Power Fluctuation Detected | View Details |
| Prr |
Display shows Prr or PR, and the spa may not operate normally.
|
Program or Configuration Error in Control Pack | View Details |
| SE |
Display shows SE or SEn, and the spa may not heat correctly.
|
Sensor Error or Sensor Out of Sync | View Details |
| Sn1 |
Control panel displays Sn1, and the spa will not heat or shows an incorrect water temperature.
|
Primary Temperature Sensor (Sensor 1) Failure or Out-of-Range | View Details |
| Sn2 |
Control panel displays Sn2, and the spa may not heat or may shut down.
|
High-Limit or Secondary Temperature Sensor Failure | View Details |
| — — |
Display is blank or shows dashes, and the spa does not respond.
|
Topside Control Panel Communication Failure | View Details |
| – |
Excessive vibration or rattling noise when pumps are running
|
Pump Mounting or Plumbing Vibration | View Details |
| – |
Foamy water and poor jet performance despite normal equipment operation
|
Water Quality and Surfactant Buildup | View Details |
| – |
Jets are weak, or some seats have very low water pressure.
|
Restricted Water Flow in Jet Plumbing | View Details |
| – |
Loud grinding or screeching noise from the pump area when jets are on.
|
Jet Pump Bearing or Motor Failure | View Details |
| – |
Ozone indicator is on, but no bubbles are coming from the ozone injector.
|
Ozonator or Mazzei Injector Failure | View Details |
| – |
Spa does not start at all; no lights on topside, completely dead
|
No Power to Spa Control Pack | View Details |
| – |
Spa heats very slowly or cannot reach set temperature in cold weather
|
Insufficient Heating Capacity or Heat Loss | View Details |
| – |
Spa is leaking water inside the equipment bay or under the cabinet.
|
Plumbing or Component Leak | View Details |
| – |
Spa lights flicker or some LEDs are out in the Michael Phelps Spas lighting system
|
LED Lighting String or Driver Failure | View Details |
| – |
Spa trips the GFCI breaker immediately or within seconds of turning it on.
|
Ground Fault or Short Circuit in Spa Equipment | View Details |
| – |
Spa water is not circulating when in filtration mode; the surface becomes stagnant.
|
Circulation Pump Not Running | View Details |
| – |
Spa will not heat; water stays cold even though pumps run and the set temperature is high.
|
Heater Element Failure | View Details |
| – |
Strong chemical or burning plastic smell from equipment bay
|
Overheating Electrical Component or Pump | View Details |
| – |
Topside control buttons are unresponsive, or some buttons work intermittently.
|
Keypad / Topside Control Panel Failure | View Details |
| – |
Water features (waterfalls, fountains) are weak or not flowing
|
Water Feature Flow Restriction | View Details |
| – |
Water temperature fluctuates widely or does not match set temperature
|
Temperature Regulation / Sensor Calibration Issue | View Details |
No matching codes found
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