Master Spas
Master 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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BLB
Display shows BLB or bLb and spa light does not work
Blower/Light Circuit Fault (varies by model)
CF
Display shows CF or CLn and prompts for filter cleaning, spa may limit heating or run pumps more often
Filter Maintenance Reminder / Flow Protection
COL
Display shows COL and spa will not heat above a low temperature setpoint
Cold Weather Protection / Economy Mode Indication
COOL
Display shows COOL and water temperature is significantly below setpoint, heater may be limited
Cool Water Condition / Extended Heat-Up Time
dr
Display shows dr or DR and heater is disabled, spa may not heat
Low Flow / Dry Heater Detected
dY
Display shows dY or DY and heater is disabled
Dry Heater Confirmed / Severe Low Flow
FLC
Display shows FLC or FL2 and spa may shut down heater, sometimes pumps run continuously
Flow Switch Closed When It Should Be Open
FLO
Display shows FLO or FL1 and heater will not run, circulation may be intermittent
Flow Switch or Pressure Switch Fault (Open When Should Be Closed)
HL
Display shows HL or HLo and spa shuts down heater, pumps may still run
High-Limit Trip / Localized Heater Overheat
ICE
Display shows ICE or IC and pumps run periodically even when spa is not in use
Freeze Protection Mode Active
LOC
Display shows LOC or lock icon and buttons do not respond
Panel Lock / Child Lock Activated
O3
Display shows O3 or OZN and ozone system does not appear to run
Ozone Generator or Ozone Circuit Fault
OH
Display shows OH or OHH and spa shuts down, pumps may run briefly then stop, water feels very hot
Overheat Condition Detected
OHt
Display shows OHt and heater shuts off, pumps may continue
Heater Tube Overheat / Localized High Temperature
P1
Display shows P1 error and Pump 1 does not operate correctly
Pump 1 Circuit or Overcurrent Fault
P2
Display shows P2 error and Pump 2 does not operate correctly
Pump 2 Circuit or Overcurrent Fault
PF
Display shows PF or PFL and spa may randomly shut off or reboot
Power Fault / Line Voltage Error
Prr
Display shows Prr or PR and spa may not heat or may shut down
Pressure Switch Error
SE
Display shows SE or SEr and controls may be unresponsive or erratic
Sensor Error / Sensor Out of Range
Sn1
Control panel displays Sn1 and spa will not heat or may shut down
Primary Temperature Sensor Failure (Sensor 1)
Sn2
Control panel displays Sn2 and spa may not heat correctly or shuts down
Secondary Temperature Sensor Failure (Sensor 2 / High-Limit Sensor)
Sn3
Display shows Sn3 and spa may shut down or ignore temperature settings
Auxiliary / Ambient Temperature Sensor Failure
UV
Display shows UV or UVC and UV sanitizer indicator is off or flashing
UV Sanitizer Lamp or Ballast Fault
— —
Display is blank or shows only dashes, spa not responding
Topside Control Panel Communication Failure
Symptom
Air blower does not turn on or shuts off quickly after starting
Air Blower Failure or Overheat Protection
Symptom
Jets are weak or some seats have very little water pressure even though pumps run
Hydraulic Flow Restriction / Air Control or Diverter Misconfiguration
Symptom
Loud grinding, squealing, or rattling noise from pump area when jets are on
Pump Motor or Wet End Mechanical Failure
Symptom
One or more jets have popped out or will not stay in place
Jet Internal Retainer Wear or Damage
Symptom
Persistent foaming on water surface even after rinsing filters
Surfactant Build-Up / Water Contamination
Symptom
Pump runs but no water comes out of jets after draining and refilling spa
Air Lock in Pump or Plumbing
Symptom
Spa is leaking water inside the equipment bay or from under the cabinet
Plumbing or Component Leak
Symptom
Spa lights flicker, some LEDs are out, or colors do not change correctly
LED Lighting System Degradation or Driver Fault
Symptom
Spa trips the GFCI breaker immediately or within a few seconds of turning on
Ground Fault or Short Circuit in Spa Components
Symptom
Spa water cools down quickly between use even though cover is on
Heat Loss / Insulation or Cover Inefficiency
Symptom
Spa water has strong chemical or musty odor despite normal readings
Water Quality Imbalance / Biofilm or Contamination
Symptom
Spa will not heat, water stays cold but pumps run normally and no error code is displayed
Heater Element Failure Without Code
Symptom
Spa will not turn on at all, no lights on control panel, completely dead
No Power to Spa / Control Pack Not Energized
Symptom
Topside control buttons are unresponsive or activate wrong functions
Keypad Overlay or Topside Control Failure
Symptom
Water feature (waterfall or fountain) not flowing or very weak
Water Feature Flow Restriction or Valve Misadjustment
Symptom
Water seeping around one or more jets on the spa shell
Jet Body Gasket or Locknut Leak
Symptom
Water temperature overshoots setpoint by several degrees before heater shuts off
Temperature Regulation Inaccuracy
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| BLB |
Display shows BLB or bLb and spa light does not work
|
Blower/Light Circuit Fault (varies by model) | View Details |
| CF |
Display shows CF or CLn and prompts for filter cleaning, spa may limit heating or run pumps more often
|
Filter Maintenance Reminder / Flow Protection | View Details |
| COL |
Display shows COL and spa will not heat above a low temperature setpoint
|
Cold Weather Protection / Economy Mode Indication | View Details |
| COOL |
Display shows COOL and water temperature is significantly below setpoint, heater may be limited
|
Cool Water Condition / Extended Heat-Up Time | View Details |
| dr |
Display shows dr or DR and heater is disabled, spa may not heat
|
Low Flow / Dry Heater Detected | View Details |
| dY |
Display shows dY or DY and heater is disabled
|
Dry Heater Confirmed / Severe Low Flow | View Details |
| FLC |
Display shows FLC or FL2 and spa may shut down heater, sometimes pumps run continuously
|
Flow Switch Closed When It Should Be Open | View Details |
| FLO |
Display shows FLO or FL1 and heater will not run, circulation may be intermittent
|
Flow Switch or Pressure Switch Fault (Open When Should Be Closed) | View Details |
| HL |
Display shows HL or HLo and spa shuts down heater, pumps may still run
|
High-Limit Trip / Localized Heater Overheat | View Details |
| ICE |
Display shows ICE or IC and pumps run periodically even when spa is not in use
|
Freeze Protection Mode Active | View Details |
| LOC |
Display shows LOC or lock icon and buttons do not respond
|
Panel Lock / Child Lock Activated | View Details |
| O3 |
Display shows O3 or OZN and ozone system does not appear to run
|
Ozone Generator or Ozone Circuit Fault | View Details |
| OH |
Display shows OH or OHH and spa shuts down, pumps may run briefly then stop, water feels very hot
|
Overheat Condition Detected | View Details |
| OHt |
Display shows OHt and heater shuts off, pumps may continue
|
Heater Tube Overheat / Localized High Temperature | View Details |
| P1 |
Display shows P1 error and Pump 1 does not operate correctly
|
Pump 1 Circuit or Overcurrent Fault | View Details |
| P2 |
Display shows P2 error and Pump 2 does not operate correctly
|
Pump 2 Circuit or Overcurrent Fault | View Details |
| PF |
Display shows PF or PFL and spa may randomly shut off or reboot
|
Power Fault / Line Voltage Error | View Details |
| Prr |
Display shows Prr or PR and spa may not heat or may shut down
|
Pressure Switch Error | View Details |
| SE |
Display shows SE or SEr and controls may be unresponsive or erratic
|
Sensor Error / Sensor Out of Range | View Details |
| Sn1 |
Control panel displays Sn1 and spa will not heat or may shut down
|
Primary Temperature Sensor Failure (Sensor 1) | View Details |
| Sn2 |
Control panel displays Sn2 and spa may not heat correctly or shuts down
|
Secondary Temperature Sensor Failure (Sensor 2 / High-Limit Sensor) | View Details |
| Sn3 |
Display shows Sn3 and spa may shut down or ignore temperature settings
|
Auxiliary / Ambient Temperature Sensor Failure | View Details |
| UV |
Display shows UV or UVC and UV sanitizer indicator is off or flashing
|
UV Sanitizer Lamp or Ballast Fault | View Details |
| — — |
Display is blank or shows only dashes, spa not responding
|
Topside Control Panel Communication Failure | View Details |
| – |
Air blower does not turn on or shuts off quickly after starting
|
Air Blower Failure or Overheat Protection | View Details |
| – |
Jets are weak or some seats have very little water pressure even though pumps run
|
Hydraulic Flow Restriction / Air Control or Diverter Misconfiguration | View Details |
| – |
Loud grinding, squealing, or rattling noise from pump area when jets are on
|
Pump Motor or Wet End Mechanical Failure | View Details |
| – |
One or more jets have popped out or will not stay in place
|
Jet Internal Retainer Wear or Damage | View Details |
| – |
Persistent foaming on water surface even after rinsing filters
|
Surfactant Build-Up / Water Contamination | View Details |
| – |
Pump runs but no water comes out of jets after draining and refilling spa
|
Air Lock in Pump or Plumbing | View Details |
| – |
Spa is leaking water inside the equipment bay or from under the cabinet
|
Plumbing or Component Leak | View Details |
| – |
Spa lights flicker, some LEDs are out, or colors do not change correctly
|
LED Lighting System Degradation or Driver Fault | View Details |
| – |
Spa trips the GFCI breaker immediately or within a few seconds of turning on
|
Ground Fault or Short Circuit in Spa Components | View Details |
| – |
Spa water cools down quickly between use even though cover is on
|
Heat Loss / Insulation or Cover Inefficiency | View Details |
| – |
Spa water has strong chemical or musty odor despite normal readings
|
Water Quality Imbalance / Biofilm or Contamination | View Details |
| – |
Spa will not heat, water stays cold but pumps run normally and no error code is displayed
|
Heater Element Failure Without Code | View Details |
| – |
Spa will not turn on at all, no lights on control panel, completely dead
|
No Power to Spa / Control Pack Not Energized | View Details |
| – |
Topside control buttons are unresponsive or activate wrong functions
|
Keypad Overlay or Topside Control Failure | View Details |
| – |
Water feature (waterfall or fountain) not flowing or very weak
|
Water Feature Flow Restriction or Valve Misadjustment | View Details |
| – |
Water seeping around one or more jets on the spa shell
|
Jet Body Gasket or Locknut Leak | View Details |
| – |
Water temperature overshoots setpoint by several degrees before heater shuts off
|
Temperature Regulation Inaccuracy | View Details |
No matching codes found
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