Wellis
Wellis 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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COdE
Display shows CODE or similar, and the spa does not start normal operation after power-up.
Configuration / Dip Switch or Software Configuration Error
dr
Display shows dr or DR, and the spa shuts down the heater; it may also show a low water level symbol.
Dry Fire Protection / Inadequate Water in Heater
dy
Display shows dy or DY after dr, and the spa remains shut down.
Persistent Dry Condition Lockout
EC
Display shows EC or ECO, and the spa heats only during filtration cycles.
Economy Heating Mode Active (Not a Fault)
F1
Control panel displays F1, and the spa will not run any pumps or the heater.
Water Flow Fault / Low Flow Through Heater
F2
Display shows F2, and the heater does not operate. The spa may run pumps, but the water will not heat.
Heater Overheat / High-Limit Trip
F3
F3 displayed; the spa may heat erratically or not at all.
Temperature Sensor Fault (Water Probe Error)
F4
F4 error; spa pumps may not start or may shut off unexpectedly.
Pump 1 Sensor / Current Fault
F5
F5 displayed; the secondary pump will not run or trips immediately.
Pump 2 Sensor / Current Fault
F6
F6 error; the blower or auxiliary device will not operate.
Blower / Auxiliary Output Fault
F7
F7 displayed; the spa may shut down or run erratically.
Low Line Voltage / Power Supply Fault
F8
F8 error; the spa may not respond to button presses or may reboot intermittently.
Topside Control Panel Communication Fault
F9
F9 displayed; the spa may not heat and may show erratic temperature readings.
Sensor Mismatch / Dual Sensor Error
FLC
Display shows FLC or FL2, and the heater is disabled even though the pump is off.
Flow Switch Closed When It Should Be Open
FLO
Display shows FLO or FL1, the heater is disabled, and pumps may still run.
Flow Switch Open / Insufficient Flow
HL
Display shows HL or HLo; pumps may run, but the heater is disabled.
High-Limit Trip (Local Overheat at Heater)
ICE
Display shows 'ICE' or a cold symbol; pumps may run automatically.
Freeze Protection Active (Not a Fault)
LOC
Display shows LOC or a lock symbol, and buttons do not respond.
Panel Lock / Child Lock Activated
OH
Display shows OH or OHH, and the spa shuts down; the water feels excessively hot.
Overheat Condition (Water Temperature Too High)
SE
Display shows SE or SEr, and the spa may not respond correctly to commands.
Software Error / Internal Control Pack Fault
SN
Display shows SN, SN1, or SNA, and the spa may not heat.
Sensor Open / Disconnected
SNS
Display shows SNS, SN2, or SNB, and the spa shuts down the heater.
Sensor Short / Out-of-Range Low
Symptom
Jet pump runs, but no water comes out of the jets after refill.
Air Lock in Jet Pump
Symptom
Jets are weak or uneven; poor massage pressure.
Low Jet Pressure / Hydraulic Restriction
Symptom
LED lights flicker, some zones are not working, or lights are stuck on one color.
LED Lighting System Fault
Symptom
Loud humming from the pump, but little or no water movement.
Seized Pump Motor or Blocked Impeller
Symptom
Ozone or UV sanitizer is not operating, and water quality deteriorates faster.
Ozone/UV System Failure
Symptom
Persistent foaming on the water surface even after skimming.
Foamy Water / Surfactant Contamination
Symptom
Scale buildup on the shell, heater, and jets (white, crusty deposits).
Limescale / High Calcium Hardness
Symptom
Spa cabinet or equipment bay smells musty or moldy.
Moisture Accumulation / Poor Ventilation
Symptom
Spa is leaking water inside the cabinet or onto the ground.
Plumbing Leak / Shell Penetration Leak
Symptom
Spa makes a loud grinding or squealing noise when the pump runs.
Worn Pump Bearings / Mechanical Failure
Symptom
Spa powers on but will not heat; temperature stays below the set point with no error code.
No Heat Without Error
Symptom
Spa trips the GFCI/RCD or main breaker when pumps or the heater start.
Ground Fault or Overcurrent Trip
Symptom
Spa will not power on at all; no lights or display.
No Power / Dead Spa
Symptom
Strong chemical or musty odor from the spa water.
Water Odor / Poor Sanitation
Symptom
Strong vibration or rattling from the spa cabinet when jets are on.
Excessive Vibration / Loose Mounting
Symptom
The air blower runs but produces weak or no bubbles.
Air Blower Flow Restriction
Symptom
The cover is heavy, waterlogged, and difficult to remove.
Waterlogged Spa Cover
Symptom
Topside control buttons are unresponsive or intermittent (no LOC code).
Keypad Failure / Moisture Intrusion
Symptom
Water is cloudy or milky despite running filtration.
Cloudy Water / Suspended Particles
Symptom
Water level drops noticeably between uses without a visible external leak.
Slow Leak / Evaporation vs. Hidden Leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| COdE |
Display shows CODE or similar, and the spa does not start normal operation after power-up.
|
Configuration / Dip Switch or Software Configuration Error | View Details |
| dr |
Display shows dr or DR, and the spa shuts down the heater; it may also show a low water level symbol.
|
Dry Fire Protection / Inadequate Water in Heater | View Details |
| dy |
Display shows dy or DY after dr, and the spa remains shut down.
|
Persistent Dry Condition Lockout | View Details |
| EC |
Display shows EC or ECO, and the spa heats only during filtration cycles.
|
Economy Heating Mode Active (Not a Fault) | View Details |
| F1 |
Control panel displays F1, and the spa will not run any pumps or the heater.
|
Water Flow Fault / Low Flow Through Heater | View Details |
| F2 |
Display shows F2, and the heater does not operate. The spa may run pumps, but the water will not heat.
|
Heater Overheat / High-Limit Trip | View Details |
| F3 |
F3 displayed; the spa may heat erratically or not at all.
|
Temperature Sensor Fault (Water Probe Error) | View Details |
| F4 |
F4 error; spa pumps may not start or may shut off unexpectedly.
|
Pump 1 Sensor / Current Fault | View Details |
| F5 |
F5 displayed; the secondary pump will not run or trips immediately.
|
Pump 2 Sensor / Current Fault | View Details |
| F6 |
F6 error; the blower or auxiliary device will not operate.
|
Blower / Auxiliary Output Fault | View Details |
| F7 |
F7 displayed; the spa may shut down or run erratically.
|
Low Line Voltage / Power Supply Fault | View Details |
| F8 |
F8 error; the spa may not respond to button presses or may reboot intermittently.
|
Topside Control Panel Communication Fault | View Details |
| F9 |
F9 displayed; the spa may not heat and may show erratic temperature readings.
|
Sensor Mismatch / Dual Sensor Error | View Details |
| FLC |
Display shows FLC or FL2, and the heater is disabled even though the pump is off.
|
Flow Switch Closed When It Should Be Open | View Details |
| FLO |
Display shows FLO or FL1, the heater is disabled, and pumps may still run.
|
Flow Switch Open / Insufficient Flow | View Details |
| HL |
Display shows HL or HLo; pumps may run, but the heater is disabled.
|
High-Limit Trip (Local Overheat at Heater) | View Details |
| ICE |
Display shows 'ICE' or a cold symbol; pumps may run automatically.
|
Freeze Protection Active (Not a Fault) | View Details |
| LOC |
Display shows LOC or a lock symbol, and buttons do not respond.
|
Panel Lock / Child Lock Activated | View Details |
| OH |
Display shows OH or OHH, and the spa shuts down; the water feels excessively hot.
|
Overheat Condition (Water Temperature Too High) | View Details |
| SE |
Display shows SE or SEr, and the spa may not respond correctly to commands.
|
Software Error / Internal Control Pack Fault | View Details |
| SN |
Display shows SN, SN1, or SNA, and the spa may not heat.
|
Sensor Open / Disconnected | View Details |
| SNS |
Display shows SNS, SN2, or SNB, and the spa shuts down the heater.
|
Sensor Short / Out-of-Range Low | View Details |
| – |
Jet pump runs, but no water comes out of the jets after refill.
|
Air Lock in Jet Pump | View Details |
| – |
Jets are weak or uneven; poor massage pressure.
|
Low Jet Pressure / Hydraulic Restriction | View Details |
| – |
LED lights flicker, some zones are not working, or lights are stuck on one color.
|
LED Lighting System Fault | View Details |
| – |
Loud humming from the pump, but little or no water movement.
|
Seized Pump Motor or Blocked Impeller | View Details |
| – |
Ozone or UV sanitizer is not operating, and water quality deteriorates faster.
|
Ozone/UV System Failure | View Details |
| – |
Persistent foaming on the water surface even after skimming.
|
Foamy Water / Surfactant Contamination | View Details |
| – |
Scale buildup on the shell, heater, and jets (white, crusty deposits).
|
Limescale / High Calcium Hardness | View Details |
| – |
Spa cabinet or equipment bay smells musty or moldy.
|
Moisture Accumulation / Poor Ventilation | View Details |
| – |
Spa is leaking water inside the cabinet or onto the ground.
|
Plumbing Leak / Shell Penetration Leak | View Details |
| – |
Spa makes a loud grinding or squealing noise when the pump runs.
|
Worn Pump Bearings / Mechanical Failure | View Details |
| – |
Spa powers on but will not heat; temperature stays below the set point with no error code.
|
No Heat Without Error | View Details |
| – |
Spa trips the GFCI/RCD or main breaker when pumps or the heater start.
|
Ground Fault or Overcurrent Trip | View Details |
| – |
Spa will not power on at all; no lights or display.
|
No Power / Dead Spa | View Details |
| – |
Strong chemical or musty odor from the spa water.
|
Water Odor / Poor Sanitation | View Details |
| – |
Strong vibration or rattling from the spa cabinet when jets are on.
|
Excessive Vibration / Loose Mounting | View Details |
| – |
The air blower runs but produces weak or no bubbles.
|
Air Blower Flow Restriction | View Details |
| – |
The cover is heavy, waterlogged, and difficult to remove.
|
Waterlogged Spa Cover | View Details |
| – |
Topside control buttons are unresponsive or intermittent (no LOC code).
|
Keypad Failure / Moisture Intrusion | View Details |
| – |
Water is cloudy or milky despite running filtration.
|
Cloudy Water / Suspended Particles | View Details |
| – |
Water level drops noticeably between uses without a visible external leak.
|
Slow Leak / Evaporation vs. Hidden Leak | View Details |
No matching codes found
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