Coast Spas
Coast 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 BLP; blower does not operate correctly.
Air Blower Fault / Overcurrent
CF
Display shows CF or CLF; filter cycle or clean filter reminder.
Filter Maintenance Reminder
COOL
Display shows COOL or COLD and heater does not run until water warms slightly.
Cold Water Protection / Freeze Prevention Mode
dr
Display shows dr or DR and heater is disabled; spa may attempt to heat and then shut down.
Dry Fire / Low Water in Heater
dY
Display shows dY or DY after a dr error; spa locks out heating until reset.
Persistent Dry Heater Lockout
ECON
Display shows ECON or EC; spa heats only during filter cycles and may not reach set temperature quickly.
Economy Heating Mode Enabled
FLC
Display shows FLC or FLOC indicating flow switch closed when it should be open; heater may be disabled.
Flow Switch Stuck Closed / Shorted
FLO
Display shows FLO or FL and heater will not run; may also show intermittent heating and flow-related shutdowns.
Insufficient Water Flow / Flow Switch Open
HL
Topside control displays HL or HtL and spa shuts down; pumps may stop and heater is disabled.
High Limit Overheat Trip
ICE
Display shows ICE or IC and pumps run periodically even when spa is not in use.
Freeze Protection Active
L1
Display shows L1 or LOW1; low-speed pump or circulation pump not detected.
Low-Speed Pump / Circulation Pump Failure
LOC
Topside control shows LOC or a lock icon; buttons do not respond to input.
Panel Lock / Child Lock Enabled
OH
Display shows OH or OHH and spa shuts down; water may feel excessively hot near heater area.
Spa Water Overheat Condition
P1
Display shows P1 error; Pump 1 does not start or trips immediately.
Pump 1 Overcurrent or Startup Failure
P2
Display shows P2 error; Pump 2 does not run or trips breaker when activated.
Pump 2 Overcurrent or Fault
PF
Display shows PF or PFL; spa may shut down unexpectedly after a power event.
Power Failure / Brownout Detected
Prr
Display shows Prr or PR indicating a priming mode or pump prime error; pumps may run but no flow is seen.
Pump Priming Failure / Air Lock
SE
Display shows SE or SEr; spa may not respond correctly to button presses.
Sensor or Software Error
Sn1
Display shows Sn1, SN1, or SENSOR 1 error; spa may not heat or may shut down.
Water Temperature Sensor Failure
Sn2
Display shows Sn2, SN2, or SENSOR 2 error; spa may shut down heater and pumps intermittently.
High-Limit Sensor Failure
—
Display is blank or shows only dashes; spa is unresponsive.
No Display / Control Pack Not Booting
Symptom
Air blower runs but very little air comes from air injectors.
Air Line Restriction
Symptom
Cloudy water that does not clear with normal filtration.
Suspended Particles / Filtration Inefficiency
Symptom
Intermittent buzzing or humming from pump but impeller does not turn.
Pump Start Capacitor Failure
Symptom
Jets are weak or some seats have very little water pressure.
Reduced Jet Flow
Symptom
LED lights do not work or some colors are missing.
Spa Lighting System Failure
Symptom
Loud grinding or screeching noise from pump area when jets are on.
Pump Bearing Failure
Symptom
No jets at all; pumps run but no water movement from any jets.
Jet Pump Not Moving Water
Symptom
Ozone generator not operating; no ozone smell or bubbles from ozone injector.
Ozonator Failure
Symptom
Persistent foaming on water surface even after skimming; foam returns quickly.
Water Chemistry Imbalance / Contamination
Symptom
Spa cabinet panels are warped, loose, or deteriorating.
Cabinet Structural Degradation
Symptom
Spa cover is heavy, sagging, and difficult to open.
Waterlogged Spa Cover
Symptom
Spa heats very slowly or cannot reach set temperature in cold weather.
Insufficient Heating Performance
Symptom
Spa shell has visible cracks or blisters (bubbles) in the acrylic surface.
Acrylic Shell Damage / Osmotic Blistering
Symptom
Spa trips the GFCI breaker immediately or shortly after turning on.
Ground Fault / Electrical Short
Symptom
Spa will not heat; water stays cold even though pumps run and set temperature is higher than actual.
Heater Element Failure
Symptom
Strong chemical or chlorine smell from spa water.
Combined Chloramines / Poor Ventilation
Symptom
Strong suction at drain or skimmer; concern about entrapment risk.
Suction Flow Imbalance
Symptom
Topside control buttons are unresponsive or only some buttons work.
Topside Control Panel Failure
Symptom
Water leaking from around pump area into equipment bay.
Pump Seal or Union Leak
Symptom
Water leaking from under spa cabinet, especially at corners or near equipment bay.
Plumbing or Jet Body Leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| BLB |
Display shows BLB or BLP; blower does not operate correctly.
|
Air Blower Fault / Overcurrent | View Details |
| CF |
Display shows CF or CLF; filter cycle or clean filter reminder.
|
Filter Maintenance Reminder | View Details |
| COOL |
Display shows COOL or COLD and heater does not run until water warms slightly.
|
Cold Water Protection / Freeze Prevention Mode | View Details |
| dr |
Display shows dr or DR and heater is disabled; spa may attempt to heat and then shut down.
|
Dry Fire / Low Water in Heater | View Details |
| dY |
Display shows dY or DY after a dr error; spa locks out heating until reset.
|
Persistent Dry Heater Lockout | View Details |
| ECON |
Display shows ECON or EC; spa heats only during filter cycles and may not reach set temperature quickly.
|
Economy Heating Mode Enabled | View Details |
| FLC |
Display shows FLC or FLOC indicating flow switch closed when it should be open; heater may be disabled.
|
Flow Switch Stuck Closed / Shorted | View Details |
| FLO |
Display shows FLO or FL and heater will not run; may also show intermittent heating and flow-related shutdowns.
|
Insufficient Water Flow / Flow Switch Open | View Details |
| HL |
Topside control displays HL or HtL and spa shuts down; pumps may stop and heater is disabled.
|
High Limit Overheat Trip | View Details |
| ICE |
Display shows ICE or IC and pumps run periodically even when spa is not in use.
|
Freeze Protection Active | View Details |
| L1 |
Display shows L1 or LOW1; low-speed pump or circulation pump not detected.
|
Low-Speed Pump / Circulation Pump Failure | View Details |
| LOC |
Topside control shows LOC or a lock icon; buttons do not respond to input.
|
Panel Lock / Child Lock Enabled | View Details |
| OH |
Display shows OH or OHH and spa shuts down; water may feel excessively hot near heater area.
|
Spa Water Overheat Condition | View Details |
| P1 |
Display shows P1 error; Pump 1 does not start or trips immediately.
|
Pump 1 Overcurrent or Startup Failure | View Details |
| P2 |
Display shows P2 error; Pump 2 does not run or trips breaker when activated.
|
Pump 2 Overcurrent or Fault | View Details |
| PF |
Display shows PF or PFL; spa may shut down unexpectedly after a power event.
|
Power Failure / Brownout Detected | View Details |
| Prr |
Display shows Prr or PR indicating a priming mode or pump prime error; pumps may run but no flow is seen.
|
Pump Priming Failure / Air Lock | View Details |
| SE |
Display shows SE or SEr; spa may not respond correctly to button presses.
|
Sensor or Software Error | View Details |
| Sn1 |
Display shows Sn1, SN1, or SENSOR 1 error; spa may not heat or may shut down.
|
Water Temperature Sensor Failure | View Details |
| Sn2 |
Display shows Sn2, SN2, or SENSOR 2 error; spa may shut down heater and pumps intermittently.
|
High-Limit Sensor Failure | View Details |
| — |
Display is blank or shows only dashes; spa is unresponsive.
|
No Display / Control Pack Not Booting | View Details |
| – |
Air blower runs but very little air comes from air injectors.
|
Air Line Restriction | View Details |
| – |
Cloudy water that does not clear with normal filtration.
|
Suspended Particles / Filtration Inefficiency | View Details |
| – |
Intermittent buzzing or humming from pump but impeller does not turn.
|
Pump Start Capacitor Failure | View Details |
| – |
Jets are weak or some seats have very little water pressure.
|
Reduced Jet Flow | View Details |
| – |
LED lights do not work or some colors are missing.
|
Spa Lighting System Failure | View Details |
| – |
Loud grinding or screeching noise from pump area when jets are on.
|
Pump Bearing Failure | View Details |
| – |
No jets at all; pumps run but no water movement from any jets.
|
Jet Pump Not Moving Water | View Details |
| – |
Ozone generator not operating; no ozone smell or bubbles from ozone injector.
|
Ozonator Failure | View Details |
| – |
Persistent foaming on water surface even after skimming; foam returns quickly.
|
Water Chemistry Imbalance / Contamination | View Details |
| – |
Spa cabinet panels are warped, loose, or deteriorating.
|
Cabinet Structural Degradation | View Details |
| – |
Spa cover is heavy, sagging, and difficult to open.
|
Waterlogged Spa Cover | View Details |
| – |
Spa heats very slowly or cannot reach set temperature in cold weather.
|
Insufficient Heating Performance | View Details |
| – |
Spa shell has visible cracks or blisters (bubbles) in the acrylic surface.
|
Acrylic Shell Damage / Osmotic Blistering | View Details |
| – |
Spa trips the GFCI breaker immediately or shortly after turning on.
|
Ground Fault / Electrical Short | View Details |
| – |
Spa will not heat; water stays cold even though pumps run and set temperature is higher than actual.
|
Heater Element Failure | View Details |
| – |
Strong chemical or chlorine smell from spa water.
|
Combined Chloramines / Poor Ventilation | View Details |
| – |
Strong suction at drain or skimmer; concern about entrapment risk.
|
Suction Flow Imbalance | View Details |
| – |
Topside control buttons are unresponsive or only some buttons work.
|
Topside Control Panel Failure | View Details |
| – |
Water leaking from around pump area into equipment bay.
|
Pump Seal or Union Leak | View Details |
| – |
Water leaking from under spa cabinet, especially at corners or near equipment bay.
|
Plumbing or Jet Body Leak | View Details |
No matching codes found
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