Marquis Spas
Marquis 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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COOL
Display shows COOL, and the heater is disabled until the water warms slightly.
Water Temperature Below Safe Heating Threshold
dr
The display shows dr or DR, and the heater shuts off; the spa may not reach the set temperature.
Dry Heater or Low Water in Heater Tube
dy
The display shows dy or DRY, and the spa shuts down the heater shortly after startup.
Confirmed Dry Heater Condition
FLC
The display shows FLC or FLOC, and the spa may heat erratically or shut down.
Flow Switch Closed When It Should Be Open
FLO
The display shows FLO or FL, and the heater will not run; heating may sometimes be intermittent.
Flow Switch Open (Insufficient Water Flow)
HFL
Display shows HFL, and the spa may shut down the heater intermittently.
Heater Flow Low Detected During Heating
HL
The display shows HL or OH, and the spa shuts down circulation and heater; water may be very hot near the heater.
High Limit Overheat Trip
ICE
Display shows ICE or IC, and the spa automatically runs pumps to prevent freezing.
Freeze Protection Mode Active
LF
Display shows LF (Low Flow), and the spa will not heat properly.
Sustained Low Flow Through Heater
LOC
Display shows LOC or LOCK, and buttons on the topside control are unresponsive.
Panel Lock or Child Lock Activated
LOC2
Display shows LOC2 or PL2, and only limited functions are available.
Partial or Settings Lock Mode
OH
The control panel displays OH (overheat), and the spa shuts down; water temperature is above the set point, often over 108°F.
Spa Water Overheat Condition
PF
Display shows PF or Prr, and pumps may not run correctly.
Pump Fault or Pump Relay Error
Pr
Display shows Pr on startup, and pumps run intermittently.
Priming Mode Active After Power-Up
Prr
Display shows Prr, and spa pumps may not respond or may shut off unexpectedly.
Pump Relay Stuck or Relay Board Error
SE
Display shows SE or SENSOR, and the spa may shut down heating.
General Sensor Error
Sn1
Control panel displays Sn1, and the spa will not heat or may shut down.
Primary Temperature Sensor Failure (Sensor 1)
Sn2
Control panel displays Sn2, and the spa may not heat or may shut down.
Secondary Temperature Sensor Failure (Sensor 2)
— —
The display is blank or shows only dashes; the spa is unresponsive.
No Display / Control Panel Communication Failure
Symptom
Foam builds up on the water surface during jet operation.
Excessive Surfactants / Contaminants in Water
Symptom
GFCI test button does not trip the breaker, or the spa does not have a GFCI-protected disconnect.
Improper or Unsafe Electrical Protection
Symptom
Jet pump hums but will not start; it may trip the breaker after a few seconds.
Seized Jet Pump Motor or Failed Start Capacitor
Symptom
Jet pump runs, but there is very weak or no water flow from jets.
Jet Pump Cavitation or Blocked Suction
Symptom
Ozone indicator is on, but no bubbles are visible from the ozone injector.
Ozonator or Injector Failure
Symptom
Spa frequently overheats on sunny days, even with a normal set temperature.
Passive Heat Gain / Inadequate Ventilation
Symptom
Spa leaks water from the equipment bay area.
Plumbing or Component Leak in Equipment Compartment
Symptom
Spa lights do not turn on, but all other functions work.
LED Lighting Circuit Failure
Symptom
Spa makes a loud grinding or squealing noise from the pump area during operation.
Worn Pump Bearings or Cavitation
Symptom
Spa shell or cabinet shows signs of water damage or soft spots near the base.
Chronic Hidden Leak in Plumbing or Fittings
Symptom
Spa trips the GFCI breaker immediately or within a few seconds of turning it on.
Ground Fault or Short Circuit in Spa Equipment
Symptom
Spa vibrates excessively and transmits noise into the deck or surrounding structure.
Pump Vibration or Misalignment
Symptom
Spa water has no circulation; the surface is still, and the heater does not run.
Circulation Pump Not Running
Symptom
Spa will not heat; water stays cold even though pumps run, and no error code is displayed.
Heater Element or Relay Failure Without Code
Symptom
Topside control buttons are unresponsive, or some buttons work intermittently.
Keypad / Topside Control Failure
Symptom
Water has a strong chemical or musty odor despite normal sanitizer levels.
Water Quality / Biofilm Contamination
Symptom
Water leaking from around a specific jet in the spa shell.
Jet Body or Gasket Leak
Symptom
Water temperature fluctuates widely or does not match the set temperature.
Temperature Regulation / Sensor Calibration Issue
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| COOL |
Display shows COOL, and the heater is disabled until the water warms slightly.
|
Water Temperature Below Safe Heating Threshold | View Details |
| dr |
The display shows dr or DR, and the heater shuts off; the spa may not reach the set temperature.
|
Dry Heater or Low Water in Heater Tube | View Details |
| dy |
The display shows dy or DRY, and the spa shuts down the heater shortly after startup.
|
Confirmed Dry Heater Condition | View Details |
| FLC |
The display shows FLC or FLOC, and the spa may heat erratically or shut down.
|
Flow Switch Closed When It Should Be Open | View Details |
| FLO |
The display shows FLO or FL, and the heater will not run; heating may sometimes be intermittent.
|
Flow Switch Open (Insufficient Water Flow) | View Details |
| HFL |
Display shows HFL, and the spa may shut down the heater intermittently.
|
Heater Flow Low Detected During Heating | View Details |
| HL |
The display shows HL or OH, and the spa shuts down circulation and heater; water may be very hot near the heater.
|
High Limit Overheat Trip | View Details |
| ICE |
Display shows ICE or IC, and the spa automatically runs pumps to prevent freezing.
|
Freeze Protection Mode Active | View Details |
| LF |
Display shows LF (Low Flow), and the spa will not heat properly.
|
Sustained Low Flow Through Heater | View Details |
| LOC |
Display shows LOC or LOCK, and buttons on the topside control are unresponsive.
|
Panel Lock or Child Lock Activated | View Details |
| LOC2 |
Display shows LOC2 or PL2, and only limited functions are available.
|
Partial or Settings Lock Mode | View Details |
| OH |
The control panel displays OH (overheat), and the spa shuts down; water temperature is above the set point, often over 108°F.
|
Spa Water Overheat Condition | View Details |
| PF |
Display shows PF or Prr, and pumps may not run correctly.
|
Pump Fault or Pump Relay Error | View Details |
| Pr |
Display shows Pr on startup, and pumps run intermittently.
|
Priming Mode Active After Power-Up | View Details |
| Prr |
Display shows Prr, and spa pumps may not respond or may shut off unexpectedly.
|
Pump Relay Stuck or Relay Board Error | View Details |
| SE |
Display shows SE or SENSOR, and the spa may shut down heating.
|
General Sensor Error | View Details |
| Sn1 |
Control panel displays Sn1, and the spa will not heat or may shut down.
|
Primary Temperature Sensor Failure (Sensor 1) | View Details |
| Sn2 |
Control panel displays Sn2, and the spa may not heat or may shut down.
|
Secondary Temperature Sensor Failure (Sensor 2) | View Details |
| — — |
The display is blank or shows only dashes; the spa is unresponsive.
|
No Display / Control Panel Communication Failure | View Details |
| – |
Foam builds up on the water surface during jet operation.
|
Excessive Surfactants / Contaminants in Water | View Details |
| – |
GFCI test button does not trip the breaker, or the spa does not have a GFCI-protected disconnect.
|
Improper or Unsafe Electrical Protection | View Details |
| – |
Jet pump hums but will not start; it may trip the breaker after a few seconds.
|
Seized Jet Pump Motor or Failed Start Capacitor | View Details |
| – |
Jet pump runs, but there is very weak or no water flow from jets.
|
Jet Pump Cavitation or Blocked Suction | View Details |
| – |
Ozone indicator is on, but no bubbles are visible from the ozone injector.
|
Ozonator or Injector Failure | View Details |
| – |
Spa frequently overheats on sunny days, even with a normal set temperature.
|
Passive Heat Gain / Inadequate Ventilation | View Details |
| – |
Spa leaks water from the equipment bay area.
|
Plumbing or Component Leak in Equipment Compartment | View Details |
| – |
Spa lights do not turn on, but all other functions work.
|
LED Lighting Circuit Failure | View Details |
| – |
Spa makes a loud grinding or squealing noise from the pump area during operation.
|
Worn Pump Bearings or Cavitation | View Details |
| – |
Spa shell or cabinet shows signs of water damage or soft spots near the base.
|
Chronic Hidden Leak in Plumbing or Fittings | View Details |
| – |
Spa trips the GFCI breaker immediately or within a few seconds of turning it on.
|
Ground Fault or Short Circuit in Spa Equipment | View Details |
| – |
Spa vibrates excessively and transmits noise into the deck or surrounding structure.
|
Pump Vibration or Misalignment | View Details |
| – |
Spa water has no circulation; the surface is still, and the heater does not run.
|
Circulation Pump Not Running | View Details |
| – |
Spa will not heat; water stays cold even though pumps run, and no error code is displayed.
|
Heater Element or Relay Failure Without Code | View Details |
| – |
Topside control buttons are unresponsive, or some buttons work intermittently.
|
Keypad / Topside Control Failure | View Details |
| – |
Water has a strong chemical or musty odor despite normal sanitizer levels.
|
Water Quality / Biofilm Contamination | View Details |
| – |
Water leaking from around a specific jet in the spa shell.
|
Jet Body or Gasket Leak | View Details |
| – |
Water temperature fluctuates widely or does not match the set temperature.
|
Temperature Regulation / Sensor Calibration Issue | View Details |
No matching codes found
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