Jacuzzi 1994-2002 Models Jacuzzi 2002-Present Models Gatsby Spas Retro Kits

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  "I'm getting an error code"

What error code are you getting? Error codes USUALLY are GREAT! The board is telling you what it sees as a failure and why its not working. It's not always reliable but pretty good.

Below are lists of most common error codes and their meaning.


   Balboa Control Systems 1994-2001 (non-M-7)


Flashing FLO or FL means the board has turned on the low or #1 pump and doesn't see water moving. It will not turn on the heater.

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SOLID FLO or FL means the board sees a closed pressurer switch. This is typically a failure of the switch.

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OH comes on and spa does not operate.

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or or

One or both of the sensors have failed.

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Board sees COLD water and will turn on heater and jet pumps to increase water temp. USUALLY will flash with another code to indicate problem. But if not, there should be not reason other than resent water change that you will get this error. Its the board telling you it see and emergency but hasn't been able to correct.


Means the board see cool water, 20 degrees below what you have set the spa for, it will turn on spa's heater. Common to display when spa water is changed with cold water.


Board is on battery backup (only Platinum Models). Check incoming power.


  Balboa Control Systems 1996-1998 WITH Dial Temperature Control and NO Digital Readout
Heater Light is: This Means: How to Fix:
Heater light off more than on Lack of Flow Error Code

Flow Error

Heater light even on/off Overheat Error Code

OH Error

Heater light on more than off Sensor Error Code

SN Error

 Balboa Instruments Using M-7 Technology. 

Hi Limit Sensor Failure


Temp Sensor Failure


Sensor plugged into Jack A Failure


Sensor plugged into Jack B Failure


Sensors out of balance. May be temporary error.


Substantial difference between temp sensors Could be water flow issue.


Persistent Low Flow Problem


Inadequate water level


Lack water pass heater. Spa is shut down.


Prime mode. Normal. No action needed.


Interlock Failure


Unknown Water Temperature


Operating in Standard Mode


Operating in Economy Mode


Operating in Standard/Economy Mode


On Battery Backup


Water Above 112-118 degrees


Water Above 118 degrees in One Sensor. Shutting Down.


Water Above 110 degrees in One Sensor. Shutting Down.


Flow or Pressure Switch Issue


Water 20 degrees Below Set Point. Will Clear When Water is Warmer.


Potential Freeze Condition.

  Jacuzzi Hot Tubs 2002-Present
Failure of the High Limit Sensor

Replace OH/High Limit Sensor Go To Sensors

Failure of the Temp Sensor

Replace Temp Sensor Go To Sensors

Lack of Water Flow or Failure of Flow or Pressure Switch

Remove filter and restart. If returns, if you DO see water moving without pushing JET button, failure of flow switch or pressure switch, whichever your spa has. If you do NOT see water automatically moving when you turn main power on, then likely the circ pump. Rare occasions its the board.

Failure of Flow or Pressure Switch

Replace Flow or Pressure Switch. Go To Switches

Cool "Cool" condition exists. Temp 20 degrees or more below set temp. Spa is attempting to heat.

Automatic; Do nothing.  Will stop when spa is heated.

Freeze Protection On

Automatic; Do nothing. Spa will turn on jet pumps to keep spa from freezing. Only panic if spa isn't heating.

Water is Above 112 degrees. Spa has turned on Low Speed pump in attempt to cool the spa

Spa automatically tries to cool spa. If water goes above accepted range, spa will shut down. Typically this means the board has failed and leaving heater on when it should not. If water and heater do not get hot but the spa goes into OH, either the OH sensor or the board has failed.

- - -
"Watchdog" mode

Most common cause is failure of the temp sensor. Replace. If that doesn't solve then likely a board failure. See >Watchdog

  ONLY On LCD Topsides:
Panel Sensors pressed to fast. Temporary deactivating

Slow down pushing buttons.

Circuit Board temp above normal. Shuts down operation until the board cools

Will reset when equipment area cools.

Panel connection/operation to board is faulty

Secure connects or in rare cases, either the board or topside has failed.

Failure of Temperature Sensor

Replace Temp Sensor.

 United Spas T-7, T-8s, and T-8x Control Systems

Spa is filtering

Spa is Heating

Freeze Mode: Below 45O . Low speed will come on and continue until spa reaches 48. No other function will work.

Water is over 113O. To reset either turn spa off briefly and power up. OR hold TEMP button down 10 sec.

Heater sensor is heating above 116O Low speed pump will come on to cool down spa. Once below 103 you can hold temp sensor down 10 minutes to reset.

Temp sensor malfunction (sensor in spa wall)

High Limit/OH sensor malfunction (sensor attached to heater)

Not enough water flow. Check filters and pump.

  Gatsby/Blueridge/Swiftriver/Imperial Spas built Tecmark Digital (1998-2002) 
Error Meaning What to do

System checks for DC power relay (master control relay) activity.

Usually the board must be replaced. Could be low current to spa or transformer problems.

Water Temp-Hts-Water Temp, tS-0-ts, or tS-255-Ht-Oht-tS- System checks the integrity of the water temperature sensor. If the temperature sensor has failed, one of these errors will show on the topside.

Usually needs a new temp sensor. Sometimes the board itself has failed.

System checks for water flow through the circulation/filtration and heater plumbing. During this process, the system checks to see if the circulation pump has input current. If an error is detected, the topside control displays the code FLO-Water Temp-FLO. Heater is deactivated. Filter pump may have lost prime and is overheating and stopped running or the filter pump cord is disconnected. Automatic reset will occur if this condition is fixed faster than ~ 5 minutes. Manual reset is requested if this condition has been in place more than 5 minutes. Check for proper water level, pump is primed, leaks and/or clogged filter. Check for filter pump cord connection.

Usually means circ pump or Low Speed #1 Pump has failed.

System checks the pressure switch for switch open with the circulation pump off. System checks automatically for this condition every 96 hours. If the error is detected, the topside control displays the code  PS2-Water Temp-PS2Heater and circulation pump are deactivated. Automatic reset will occur if this condition is fixed.

Pressure switch may need to be adjusted or replaced or water level is too high.

System checks the pressure switch for switch closure with circulation pump on. If an error is detected the topside control displays PS1-Water Temp-PS1-. The heater is deactivated. Automatic reset will occur if this condition is fixed in less than ~ 5minutes. Manual reset is required if this condition continues for more than 5 minutes.

Try removing the filters and restarting system. If PS1 discontinues, replace filters. If you do not see water movement, circulation pump likely failed. Replaced. If you see water movement and filters are out but PS1 is still present, replace pressure switch.

Freeze condition. System checks the water temperature for a reading at or below 60deg F. If below, the topside control displays the code FC-Water Temp-FC-A potential freeze condition has been detected (60 deg F or below). No action required. The system will automatically energize the heater. The heater will be energized even in the ECO mode. The spa will automatically bring the water temperature up until the spa is out of danger.  When the water temperature in the spa is equal to or less than 50 deg F both pump relays are energized for 5 minutes (heater is deactivated during this time), heater is energized for 20 minutes again (pumps are deactivated during this time) and this cycle is repeated until the water temperature is equal to or above 60 deg F.

Automatically clears when water is heated.

High temperature condition. System checks for the spa water temperature equal to or above 110deg F. If a water temperature equal to or above 110deg F is detected, the topside control LED readout flashes between the spa water temperature and Ht. The Air Blower (if equipped) is automatically energized to assist in lowering water temperature. The blower will be deactivated after the spa water temperature drops below 107deg F. This case may be due to excessive single speed pump(s) operation, i.e. resetting the Jets1, Jets2 (if equipped) continuously after each 20 minute shut down cycle until the spa water reaches this temperature. Allow time for the system to reset the spa.

If Ht returns and topside temp is correct, usually means board must be replaced.

Overheating condition/watchdog.  System checks for the spa water temperature equal to or above 120deg F or the heater enclosure temperature is equal to or above 125deg F. If either the spa water temperature is equal to or above 120deg F or the heater enclosure temperature is equal to or above 125deg F, the topside control display flashes Oht-Water Temp-Oht and the entire system is disabled.  Oht condition requires Manual Reset action either by pushing the WARMER and COOLER buttons simultaneously, or by turning the main power off and then back on. The heater or water high limit switch cannot be reset until the heater enclosure temperature drops below 123deg F or water temperature in the spa drops below 117deg F.

If actual water temp is same as topside, likely must replace board.

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