Common Hot Tub Error Codes

Wondering what your spa is trying to tell you?  Below is a list of common error codes from the top manufacturers of control equipment for hot tubs. 

Note:  The control system brand name is usually different from the hot tub brand name.  You can often determine the make of the control system by looking inside the spa's equipment area. 

Disclaimer: Although we hope this information will be useful, error codes are subject to change without notice. We make no representation as to the accuracy or completeness of this data and aren't responsible for errors or omissions. Refer to your owner's manual. 

Brett Aqualine Error Codes 

• OH: Temp exceeds 118 F 
• Fr: Freeze condition - temp below 40 degrees 
• FL: Pressure switch failure 
• EO: Shorted temp sensor 
• E1: Open temp sensor 
• E2: Shorted hi-limit sensor 
• E3: Open hi-limit sensor 
• E4: Shorted flow switch 
• E7: Improper electrical connection 

CTI Error Codes 

• thl/39: temp probe problem 
• th2/current temp: temp probe problem 
• th3/39: water temp below 39° F 
• OH: water over 112° F. System will restart when temp. drops 
• hot: water over 112° F. System will restart when temp. drops 
• HL: High limit switch tripped 

Dream Maker Error Codes 

• OH: Overheat 108° F, spa is deactivated. 
• FL: Flow. Pressure switch not working 
• SN: Non functional high temperature sensor. Heater is deactivated 
• F2: 4 hours daily filtration 
• F4: 8 hours daily filtration 
• F6 : 12 hours daily filtration 
• FC : continuous filtration 

EasyPak Error Codes 

• C: Celsius 
• CL: Current Time of Day 
• ECdu: Econo Mode Duration 
• Econ: Econo Mode Turn On 
• F: Fahrenheit 
• Fldu: Filter Cycle Duration 
• Flon: Filter Cycle Turn On 
• FLC: Pressure Switch Alarm 
• FLO: Pressure Switch Alarm 
• FrEE: Freeze Protection Alarm 
• HL: High Temperature Alarm 
• Loc: Panel / Keypad Locked 
• PrH: Temperature Sensors Alarm 
• Prr: Temperature Sensors Alarm 
• Tu: Temp Set Celsius 
• Tu: Temp Set F 

Gecko 

• AOH: Temp in Equipment compartment to high 
• FLO: Pressure switch failure, switch open 
• FLC: Pressure switch failure, switch closed 
• FrE: Possible freeze condition 
• Flashing Display 
• 3 Flashing Dots 
• 3 Flashing Dots & LED 
• HL: Sensor measuring 119F 
• Prr: Temp sensor failure 
• Prh: Hi-limit sensor failure 

Gecko SP Codes (Spa Packs) 

• SP-HR: hardware error 
• SP-BR: breaker setting to low 
• SP-IN: Input voltage low 
• SP-F1,F2 or F3: Fuse 1,2 or blown 
• SP-OT: Temp inside skirt high 
• SP-OH: Water temp over 112F 

Gecko RH Codes (Heater) 

• RH-HR: Heater Hardware error 
• RH-NH: Heat attempted & failed 
• RH-NF: No flow in heater 
• RH-NC: Comm error to Pack 
• RH-HL: Heater Hi Limit 
• Gecko Accessory Codes 
• P1, P2 or P3-ER: Pump 1,2 or 3 failure 
• CP-ER: Circ pump failure 
• BL-ER: Blower failure 
• O3-Er: Ozone error 
• A1/A2-ER: Aux. system error 
• FN-ER: Fan failure 
• FB-ER: Fiber optic failure 
• SC-ER: System learning failure 

Hercules Error Codes 

• OH: Spa temp exceeds acceptable limits 
• FLO: Flow problem 
• ICE: Freeze condition detected 
• SN1: Hi-limit sensor failure 
• SN2: Temp sensor failure  

Hurricane Error Codes 

• PS: Flow/pressure switch fail 
• SH: Shorted sensor 
• OP: Open Sensor Degrees 
• LO: Temp below 60 degrees 
• HL: Temp above 118 degrees 
• OH: Spa temp exceeds limits 
• FLO: Flow problem 
• ICE: Freeze condition detected 
• SN1: Hi-limit sensor failure 
• SN2: Temp sensor failure 
• C: Celsius 
• CL: Current Time of Day 
• ECdu: Economy Mode Duration 
• Econ: Economy Mode Turn On 
• F: Fahrenheit 
• Fldu: Filter Cycle Duration 
• Flon: Filter Cycle Turn On 
• FLC: Pressure Switch Alarm 
• FLO: Pressure Switch Alarm 
• FrEE: Freeze Protection Alarm 
• HL: High Temp Alarm 
• Loc: Panel / Keypad Locked 
• PrH: Temperature Sensors Alarm 
• Prr: Temperature Sensors Alarm 
• Tu:  Temperature Set Celsius 
• Tu: Temperature Set Fahrenheit 

Spa Quip Error Codes 

• err 1 (H20) : Prime Failed 
• err 3: Stuck Button 
• err 4 : No Water Sensor 
• err 5 : Over temp 
• err 6 : Thermal Cut Out Tripped 
• err 7 : Stuck Relay 
• err 8 : No Temp Data 
• 01: Stuck Button 
• 02: No Controller Data 
• 03: Temp Sensor 
• 04: Water Sensor 
• 05: Spa Over Temp 
• 06: Heater Thermal Cut Out 
• 07: Stuck Heater Relay 
• 09: Water Prime Failed 

Sundance Spas Error Codes 

• COL: Temp 20F below set point 
• ILOC: Interlock failure - possible pump/ozone spike 
• FLO/FL1/FL2: Flow/Pressure switch malfunction 
• Hold: Panel buttons pressed to many times/quickly 
• HOT: PCB temperature above acceptable limit - air blower on 
• ICE: Potential freeze condition 
• Pnl: Communication between PCB and panel interrupted 
• Sn1: Hi-limit sensor failure 
• Sn3: Temp sensor failure 
• ---: "Watchdog" problem detected (possible temp /hi-limit error) 

Error & LCD Window Message Codes: 

ACC (Applied Computer Controls) 

• CoLd = Temperature in the spa heater housing is below 40° F. Status of the heater element is unknown. The low speed pump or circ pump will operate continuously until the temperature rises above 45° F.
• OH = Over heat. The spa is at a temperature above 108° . Do not use spa when temperature is flashing or the OH message is displayed.
• HLoH = Hi Limit Over Heat. Hi limit sensor is disconnected or shorted or the spa temperature is above 112° F.
• SEoP = Sensor open or disconnected.  Heater disabled but the spa is operational.
• SESH = Sensor short, nonfunctional. Heater disabled but the spa is operational.
• PSoC = Pressure switch open with circulating pump.
• PSoL = Pressure switch open with low pump.
• PSoH = Pressure switch open with high pump.
• ToE = Time out error. Rare system error.  Spa unusable. Contact ACC. 

Balboa (used by LifeCast Spas and many other hot tubs) 

Balboa Error Codes 

• pd: Power supply, unit running on battery backup
• OH: Sensors reading 112-118F 
• OHH = Overheat. Spa has shut down. One sensor has detected 118° F at heater.
• OHS = Overheat. Spa has shut down. One sensor has detected 110°F.
• Flo = Improper flow or pressure switch malfunction
  
• Cool = Water temp 20° below set point
• ICE = Potential freeze condition has been detected
• Sn1 = Hi-limit sensor malfunction
• Sn3 = Temp sensor malfunction
• SnA = Spa is shut down. Sensor plugged into jack A is not working.
• Snb = Spa is shut down. Sensor plugged into jack B is not working.
  
• SnS = Sensors out of balance. If alternating with temp, may be temporary condition. If display shows only this message (blinking) spa is shut down.
• HFL = Substantial difference between temperature sensors detected. Could indicate a flow problem.
• LF = Persistent low flow problems. (Displays on the 5th occurrence of "HFL" message with 24 hours).  Heater is shut down, but other spa functions run normally.
• dr = Inadequate water detected in heater.
• dry = Inadequate water detected in heater. (Displays on third occurrence of "dr" message).  Spa is shut down.
• Pr = When spa is first actuated, it will go into Priming Mode.
• ILOC = Interlock failure - possible pump or ozone spike .
• (---) =Unknown water temperature. (Displays when first powered up after refill).
• Std = Spa operating in Standard Mode.
• Ecn = Spa operating in Economy Mode.
• SE = Spa operating in Standard-in-Economy Mode. 
  

Brett Aqualine 

• OH = Temp exceeds 118° F
• Fr = Freeze condition - temp below 40° F
• FL = Pressure switch failure
• EO = Shorted temp sensor
• E1 = Open temp sensor
• E2 = Shorted hi-limit sensor
• E3 = Open hi-limit sensor
• E4 = Shorted flow switch
• E7 = Improper electrical connection 

CTI 

• th1/39 = On startup indicates temperature probe problem.
• th2/current temperature = On startup indicates temperature probe problem.
• th3/39 = On startup indicates water temperature less than 39° F.
• OH = Overheating, water over 112° F. System will restart when temp. drops.
• hot = Overheating, water over 112° F. System will restart when temp. drops.
• HL = High limit switch tripped. 

Dream Maker Hot Tubs 

• OH = Overheat 108° F, spa is deactivated. Do not enter the water.
• FL = Flow. Pressure switch is not working.
• SN = Non functional high temperature sensor.  Heater is deactivated.
• F2 = 4 hours daily filtration
• F4 = 8 hours daily filtration
• F6 = 12 hours daily filtration
• FC = continuous filtration 

EasyPak 

• C = Celsius
• CL = Current Time of Day
• ECdu = Economy Mode Duration
• Econ = Economy Mode Turn On
• F = Fahrenheit
• Fldu = Filter Cycle Duration
• Flon = Filter Cycle Turn On
• FLC = Pressure Switch Alarm
• FLO = Pressure Switch Alarm
• FrEE = Freeze Protection Alarm
• HL = High Temperature Alarm
• Loc = Panel / Keypad Locked
• PrH = Temperature Sensors Alarm
• Prr = Temperature Sensors Alarm
• Tu = Temperature Set Celsius
• Tu = Temperature Set Fahrenheit

Gecko 

• FLO = Pressure switch failure, switch open
• FLC = Pressure switch failure, switch closed
• Prr = Temp sensor failure
• Prh = Hi-limit sensor failure
• HL = Sensor measuring 119° F
• FrE = Possible freeze condition detected 

Hercules 

• OH = Spa temp exceeds acceptable limits
• FLO = Flow problem
• ICE = Freeze condition detected
• SN1 = Hi-limit sensor failure
• SN2 = Temp sensor failure 

Hurricane 

• PS = Flow or pressure switch failure
• SH = Shorted sensor
• OP = Open Sensor
• LO = Temp below 60° F - freeze
• HL = Temp above 118° F 

Hydro-Quip 

• C = Celsius
• CL = Current Time of Day
• ECdu = Economy Mode Duration
• Econ = Economy Mode Turn On
• F = Fahrenheit
• Fldu = Filter Cycle Duration
• Flon = Filter Cycle Turn On
• FLC = Pressure Switch Alarm
• FLO = Pressure Switch Alarm
• FrEE = Freeze Protection Alarm
• HL = High Temperature Alarm
• Loc = Panel / Keypad Locked
• PrH = Temperature Sensors Alarm
• Prr = Temperature Sensors Alarm
• Tu = Temperature Set Celsius
• Tu = Temperature Set Fahrenheit 

Jacuzzi Whirlpool 

• OH = Overheat Protection (Heater is deactivated, pumps low speed is activated).
• COOL = Spa water is more than 20° F cooler than the temperature set point.
• FLO* = Flow Switch (heater is deactivated. Pump may also be deactivated).
• Hold = Panel sensors have been pressed too many times in a short period of time.
• HOT = Circuit Board temperature has exceeded acceptable limit.
• ICE = Freeze protection.  No action is necessary.
• ICE2 =  Freeze protection.  No action is necessary.
• PnL = Communication between the panel and circuit board is faulty.
• ---- = "Watchdog" (spa is deactivated) A problem has been detected.
• Sn1 = Open sensor (heater is deactivated) or  Shorted sensor (spa is deactivated).
• Sn3 = Open or shorted sensor ( heater disabled).
• FLO2 = Closed or shorted flow switch on system startup 

Pinnacle 

• OH = Temperature has exceeded 110° F
• SN = Sensor failure
• FL = Flow/pressure switch stuck in closed position

Spa Builders 

• Sn1 = Nonfunctional high temperature sensor. Heater is deactivated.
• Sn2 = Nonfunctional temperature sensor. Heater is deactivated.
• FL1 = Water flow problem, inhibited or pressure switch malfunction. Check for proper spa water level and ensure pump is primed. Check for clogged filter.
• FL2 = Pressure switch problem. Switch closed while pump is deactivated.
• COL = Cool condition. If water temperature drops 20°F below set temperature, low speed pump and heater activates to bring temperature within 15° of set temperature.
• ICE = Freeze condition. 55°F detected. Low speed pump and heater will activate until spa reaches 65°F.
• OH = High temperature condition, has reached 110°F. Do not enter the spa. Low speed pump (and air blower if so equipped) will activate to assist in lowering temperature.
• --- = "Watchdog".  Water temperature has reached 118°F. Entire system is disabled.  Contact qualified service technician. 

Sundance Spas 

• ILOC = Interlock failure - possible pump or ozone spike
• FLO = Pressure switch malfunction or Flow switch malfunction (system specific) 
• Hold = Panel buttons pressed to many times to quickly
• HOT = PCB temperature above acceptable limit - air blower on
• ICE = Potential freeze condition
• Pnl = Communication between PCB and panel interrupted
• Sn1 = Hi-limit sensor failure
• Sn3 = Temp sensor failure
• ---- = "Watchdog" (spa is deactivated) A problem has been detected

Vita Spas 

• HiLi = Water temp over acceptable limit
• BJ2P = Pump/Blower purge - normal condition
• FP = Freeze protect-temp under acceptable condition
• SS=0; SS=S; LS=O; LS=S = Multiple causes; open sensors, bad connection to panel, improper voltage, etc. 

This is a list of Common spa error codes for many different spa brands 

1)  Hot Tub Error Codes (Alphabetical) 

•  * * * (3 flashing dots under temp display) -   Flow/Pressure switch either Open or Closed Circuit 
•  * * * (as above, & red LED lit up on board) - High Limit Fault 
•  - - - , - - -      ‘Watchdog’ - 48C reached, electronic fault, shuts system down. Major fault 
•  - 01     Hi-Limit fault 
•  - 02     Temp sensor fault 
•  - 03     Flow/pressure switch open 
•  - 04     Flow/Pressure switch closed 
•  - 07     Hi-limit fault 
•  --- “Watchdog” (spa is deactivated), likely a bad temp or hi-limit sensor or water temp has reached 118ºF 
•  ---  Unknown water temperature. (Displays when first powered up after refill) 
•  01     Stuck Button 
•  02     No Controller Data 
•  03     Temperature Sensor 
•  04     Water Sensor 
•  05     Spa Over Temperature 
•  06     Heater Thermal Cut Out 
•  07     Stuck Heater Relay 
•  09     Water Prime Failed 
•  131     Hi-limit 
•  A1/A2-ER     Aux. system error 
•  AOH     Temp in Equipment compartment to high 
•  BJ2P     Hi-Limit - water temp too high 
•  BJ2P      Pump/Blower purge - normal condition 
•  BL-ER      Blower failure 
•  C4.4      Hi- Limit 
•  C     Celsius 
•  Cd, CLd     Freeze Condition 
•  CE 01     Stuck Touchpad button 
•  CE 02     No controller Data Communication 
•  CE 03     Temperature sensor fault 
•  CE 04     Water Sensor/Pressure switch fault 
•  CE 05     Over Temperature Condition 
•  CE 06     High Limit manual reset Klixon tripped 
•  CE 07     Stuck Relay 
•  CE 08     Temp Sensor Fault -( Spaquip Digital 2000 MK1 sensor) 
•  CE 09     Water Prime Fault - Lack of water 
•  CL     Current Time of Day 
•  COL     Cool condition. Water temp 20ºF below set temp. Low speed pump & heater activate 
•  Cold     Temp in heater housing is below 40° F. Low speed /circ pump will run until the temp rises above 45° F. 
•  Cool, COOL, COL     Water is 11C below set point - not a fault 
•  COOL     Spa water is more than 20° F cooler than the temperature set point 
•  CP-ER     Circ pump failure 
•  DR, dr, dy?     Inadequate water detected in heater. 
•  dr     Inadequate flow in heater. 
•  dry     Inadequate flow in heater. (Displays on third occurrence of “dr” message) 
•  E###      pH probe out of calibration 
•  E0      Short circuit temperature sensor 
•  E1     Open circuit temperature sensor or open temp sensor 
•  E2     Short circuit/closed high limit sensor or shorted hi-limit sensor 
•  E3     Open circuit high limit sensor or open hi-limit sensor 
•  E4     Short circuit/closed pressure/flow switch or shorted flow switch 
•  E7     Improper electrical connection 
•  ECdu     Economy Mode Duration 
•  Ecn      Spa operating in Economy Mode 
•  Econ     Economy Mode Turn On 
•  EO      Shorted temp sensor 
•  Er0, Er1     Temperature sensor faulty 
•  Er2, Er3     Hi-Limit fault 
•  Er4      Flow/Pressure switch short circuit 
•  err 1      (H20) Prime Failed 
•  err 3     Stuck Button 
•  err 4     No Water Sensor 
•  err 5     Over temp 
•  err 6      Thermal Cut Out Tripped 
•  err 7     Stuck Relay 
•  err 8     No Temp Data 
•  Err      Software Program Fault 
•  Error 3     Stuck touchpad button 
•  Error 4     Water sensor fault 
•  Error 5     Over temperature 
•  Error 6     Klixon Tripped - over temp 
•  Error 7      Stuck Relay 
•  Error 8     Temperature sensor fault 
•  F2     4 hours daily filtration 
•  F4      8 hours daily filtration 
•  F6      12 hours daily filtration 
•  F      Fahrenheit 
•  FB-ER     Fiber optic failure 
•  FC      continuous filtration 
•  FL1      Flow problem/pressure switch malfunction. Check for low water or clogged filter. Ensure pump is primed. 
•  FL2      Pressure switch problem. Switch closed while pump is deactivated 
•  FL      Flow/pressure switch stuck in closed position or pressure switch or flow switch failure 
•  FLC, FL2     Flow/pressure switch closed circuit - debris in switch, perforated diaphragm. 
•  FLC      Pressure switch failure, switch closed 
•  Fldu      Filter Cycle Duration 
•  FLO*     Flow Switch (heater is deactivated. Pump may also be deactivated) 
•  FLO, Flo, FL1     Pressure switch open - lack of pressure OR for Sundance/Spa Builders/Balboa, pressure switch closed 
•  FLO2      Closed or shorted flow switch on system startup 
•  FLO (flashing)     Flow switch open circuit - Sundance/Spa Builders/ Balboa 
•  FLO      Pressure switch or Flow Switch malfunction (heater and/or pump may be deactivated) 
•  Flon     Filter Cycle Turn On 
•  FN-ER     Fan failure 
•  FP      Freeze protect mode - temp under acceptable condition 
•  Fr      Freeze condition - temp below 40 degrees 
•  FrE     Fr, FP Freeze condition detected 
•  FrE      Possible freeze condition 
•  FrEE      Freeze Protection Alarm 
•  H2O      Water Prime Fault - lack of water 
•  HFL     Substantial difference between temperature sensors detected. Could indicate a flow problem 
•  HiLi, HLEr      Water temperature above acceptable range 
•  HL, HFL, HH, OHH     High limit sensor reading 45-48C, or above - check flow 
•  HL     Temp above 118 degrees. High limit switch tripped 
•  HLoH     Hi Limit Over Heat. Hi limit sensor is disconnected, shorted, or spa temp is above 112° F 
•  Hold      Panel buttons pressed to many times/quickly 
•  HOT      Circuit Board temperature has exceeded acceptable limit. System will restart when temp. drops 
•  I CE2     Freeze protection. No action is necessary 
•  IC      Freeze Condition 
•  ICE      Freeze condition. 55ºF detected. Low speed pump and heater will activate until spa reaches 65ºF 
•  ILOC      Interlock failure - possible pump/ozone spike - possibly caused by faulty ozonators, pumps and equipment 
•  L1      Panel Lock 
•  L2      Panel Lock 
•  LF     Persistent low flow. (Displays on 5th occurrence of “HFL” message with 24 hours). Heater is shut down 
•  LO      Freeze Condition 
•  LOC      Control Panel functions Locked 
•  Loc      Panel / Keypad Locked 
•  LS=0, LS=S     Multiple causes - open circuit sensor, faulty panel connection, improper voltage, etc 
•  O3-Er     Ozone error 
•  OH      High temperature condition, has reached 110ºF. Spa may be partially deactivated or low speed pump (and air blower if equipped) may activate to lower temp 
•  OHH      Overheat. One sensor has detected 118º. Spa has shut down 
•  OHS     Overheat. One sensor has detected 110º. Spa has shut down 
•  OP      Open circuit sensor 
•  P1, P2 or P3-ER     Pump 1, 2 or 3 failure 
•  pd      Power supply interrupted, unit running on battery backup 
•  PLUG      Sundance/Spa Builders Service Technician’s Test Plug accidentally left connected to PCB 
•  PnL      Communication error between the panel and circuit board 
•  Pr      System Priming - When spa is first actuated, it will go into Priming Mode 
•  Prh      Hi-limit sensor failure 
•  Prr      Temperature Sensors Alarm 
•  PS      Flow or pressure switch failure 
•  PSoC      Pressure switch open with circulation pump 
•  PSoH      Pressure switch open with high pump 
•  PSoL      Pressure switch open with low pump 
•  Rly      Stuck Relay on In.XE 
•  RH-HR     Heater Hardware error 
•  RH-NC     Comm error to Pack 
•  RH-NF     No flow in heater 
•  RH-NH     Heat attempted & failed 
•  SA, SnA, SnH, Sb, Snb, Snt      Sensor Open Circuit or faulty 
•  SC-ER      System learning failure 
•  SE     Spa operating in Standard-in-Economy Mode 
•  SEoP     Sensor open or disconnected. Heater disabled but spa operational 
•  SESH     Sensor short, nonfunctional. Heater disabled but spa operational 
•  SH      Short circuit sensor 
•  Sn1      Hi-limit sensor malfunction 
•  Sn2      Nonfunctional temperature sensor. Heater deactivated 
•  Sn3      Temp sensor malfunction 
•  SN      Non functional high temperature sensor. Heater is deactivated 
•  Sn     Sensors out of balance 
•  Sna      Sensor plugged into jack A is not working. Spa is shut down 
•  Snb      Sensor plugged into jack B is not working. Spa is shut down 
•  SnH      Hi Limit circuit open or faulty 
•  SnS      Sensors out of balance. If display shows only this message (blinking) spa is shut down 
•  SnT      Temp sensor circuit open or faulty 
•  SP-BR     breaker setting to low 
•  SP-F1,F2 or F3     Fuse 1, 2 or blown 
•  SP-HR     hardware error 
•  SP-IN     Input voltage low 
•  SP-OH     Water temp over 112F 
•  SP-OT     Temp inside skirt high 
•  SS=0;SS=S;LS=O;LS=S     Multiple causes; open sensors, bad connection to panel, improper voltage, etc. 
•  Std      Spa operating in Standard Mode 
•  th2/current     On startup indicates temperature probe problem 
•  th3/39     On startup indicates water temperature less than 39° F 
•  thl/39     temp probe problem 
•  ToE     Time out error. Rare system error. Spa unusable. 
•  Tu      Temperature Set Celsius or Fahrenheit 

2)  Flashing Light Error Codes 

•  1 flash - 3 second gap     High Limit fault 
•  2 flashes - 3 second gap     Pressure/Flow switch short circuit 
•  3 flashes - 3 second gap      Pressure/Flow switch open circuit 
•  4 flashes - 3 second gap     Open circuit Sensor(s) 
•  Flash - 1 second on, 1 second off     Same as OH 
•  Flash - briefly OFF once per second      Same as Sn1 or Sn3 
•  Flash - briefly ON once per second     Same as FLC 
•  Blinking Power Indicator Light - Hydromate      High Limit tripped or, sensor fault 
•  1 flash per second - onga 4352 53, 95, etc      Pressure switch open circuit - could also be motor, or motor thermal overload 
•  3 flashes per second - onga 4352 53, 95, etc     Electronic fault - sensor (most common cause) or PCB 
•  Green flashes - Spaquip Pulsar/2095 series     Water sensor fault - lack of water 
•  Red/Green alternate flashes     Temperature sensor fault, open circuit, or high limit tripped - push Reset Rod
• CoLd : Temp in heater housing is below 40° F. Low speed / circ pump will operate continuously until the temp rises above 45° F. 
• OH : Overheat. Spa temp over 108°.  
• HLoH : Hi Limit Over Heat. Hi limit sensor is disconnected, shorted, or spa temp is above 112° F. 
• SEoP : Sensor open or disconnected. Heater disabled but spa operational. 
• SESH : Sensor short, nonfunctional. Heater disabled but spa operational. 
• PSoC : Pressure switch open with circulation pump.  
• PSoL : Pressure switch open with low pump.  
• PSoH : Pressure switch open with high pump.  
• ToE : Time out error. Rare system error.