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The Daily Insight

Why does my hot tub say F1

Author

Christopher Lucas

Published Mar 27, 2026

FL1/FL2. This code means any of the following: the flow switch is malfunctioning open (FL1) or closed (FL2), the filter cartridge needs to be changed or cleaned, or there is an “air lock” condition at the circulation pump intake.

How do I fix FL1 error on jacuzzi?

If the FL1 error goes away after removing the filters, it is possible that your filters need to be cleaned or replaced. Clean and/or purchase new filters. Reinstall the clean or new filters into the hot tub.

What does Fl mean on a hot tub?

Today’s post is about water flow trouble codes on your spa panel. These are usually presented as FL, FLO or FLOW on your display, although it may appear as LF (Low Flow) or PS (Pressure Switch). Low flow error codes are really a self-preservation exercise for your hot tub.

How do you fix the code on a hot tub?

This error message is similar to the FLO error message. Like FLO issues, this can commonly be fixed by topping off your hot tub water level. DR or DRY will show up if there is little to no water travelling through your heater.

Where is the flow switch on a hot tub?

The flow switch is located behind the outside walls of the spa and connected to the plastic piping.

What does FL1 mean on a Sundance hot tub?

When FL1 code starts flashing it means the flow switch is malfunctioning and stuck open-likely because of a dirty filter or because there is an air lock problem at the circulation pump intake. When FL2 code starts flashing it means the flow switch isn’t working and it is stuck closed.

What does Fl mean on a Beachcomber hot tub?

A flashing FL indicates a dirty or clogged filter a solid FL indicates a bad pressure switch.

How do I know if my hot tub has an airlock?

As mentioned above, the most common sign that your hot tub has an air lock is the jets not working when powered on. This can include nothing coming out of your jets when they are turned on or even a humming sound coming from the jets or pump.

Where is the reset button on my hot tub?

Locate the spa’s high-limit reset. This is a red button found on many spa packs. It may be located on the heater and covered by a rubber nipple.

What are the codes on a hot tub?

CODEERROR CODE DESCRIPTIONCE 04Water sensor/pressure switch faultCE 05Temperature sensor, or water is dangerously hotCE 06High limit manual reset on heater is trippedCE 07Stuck heater relay

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How do I know if my flow switch is bad?

”No Flow” light coming on probably means the cell’s flow switch has gone bad. Verify that the pump is running first (water is actually flowing through the line). If “No Flow” stays on the flow switch needs replacing. ”Flow” LED turning from green to red means water flow through the system has been disrupted.

How do you test a flow switch?

  1. Put cover on the flow switch and turn power on. Video of the Day.
  2. Start flow through the designated system.
  3. Observe flow in operation to determine if flow switch is working properly.
  4. Repeat this process many times to ensure flow switch and designated system is in fact working accurately. Tip.

How do you bypass a flow switch?

  1. Shut off the circuit breaker that controls electricity to the pool heater and the pool pump that sends water through the heater. …
  2. Use a screwdriver to take out the screws holding the housing over the heater. …
  3. Detach the two wires from the sensor.

What does flow error mean?

My hot tub has a flow error. All hot tubs are equiped with a way of detecting that there is water flowing through the heater. … A flow error is the most common type of problem that arises in hot tubs. There are lots of possible causes, but the most common are: Water issues: Dirty filters, low water levels, blockages.

What does se mean on my hot tub?

SE = Spa operating in Standard-in-Economy Mode.

Where is the reset button on my Beachcomber hot tub?

Take off the hot tub cover to allow the water to cool down. You can reset by pushing any button once the heater cools down. Verify that the knife valve located on the heater’s return side is closed – once verified it’s closed, be sure all the knife valves are in the open or up position.

Where is the pressure switch on a Beachcomber hot tub?

The Pressure Switch on a hot tub or spa is a pressure sensor that is mounted onto the heater housing, or very close to the exit point of the heater. It’s sole purpose is to shut off the heater if low pressure (low water flow) occurs.

How do I reset the high limit switch on my hot tub?

The hot tub high limit switch is sometimes triggered when you’re refilling your hot tub and can be reset by pressing the large red button on your spa pack.

How do you reset the bulb on a Sundance spa?

  1. Ensure your spa is in ‘Standard’ Mode.
  2. Then, press the (CYCLE) button three times; The screen will display “U.” At this time the system is ready to accept your changes.
  3. Press the select button and it will read “ON”.
  4. Press the up or down temperature button until it reads “OFF”.

Why is my Sundance hot tub light red?

The indicator light located on the front cabinet panel of the spa is an early detection system that will notify you when the spa needs immediate attention. A solid white light indicates that all operations are normal. A solid red light indicates that immediate attention is required to clear or fix an error code.

Why is my hot tub not getting hot?

If your spa heater won’t heat, remove and clean the filter(s) to rule out a pressure or flow rate problem in your hot tub heater. Low water level, a clogged pump impeller, closed valves, clogged pipes, or blocked spa drain covers can also cause flow issues.

How do you restart a hot tub?

  1. Drain the Hot Tub. …
  2. Flush the Hot Tub Jets. …
  3. Clean the cover, inside the shell of the hot tub and the outside cabinet. …
  4. Remove and clean your filters. …
  5. Wait for your hot tub to dry. …
  6. Check the wiring. …
  7. Refill the hot tub.

How do I know if my hot tub fuse is blown?

You could perform a continuity check on the fuse. If it reads zero, the fuse is blown and should obviously be replaced. But even if it shows some reading it may be partially defective and you should replace it with a new one to see if it corrects the problem.

Will an airlock clear itself?

Airlocks do sometimes fix themselves, but it isn’t a risk worth taking. Airlocks occur when air becomes trapped in the hot water or central heating system. Vapour becomes caught in a high point of the pipework because the gas is less dense than the water in the system.

What does E1 mean on hot tub?

The E1 Error Code has been implemented to indicate when the Portable Control Unit (PCU) senses a fault with the temperature sensors. This fault may be a worn sensor, corroded connection or wiring.

What does a flow switch do on a pool?

The flow switch is designed to prevent such a scenario by allowing the device to produce chlorine only when sufficient water flow is detected in the pipeline. For optimal results, the flow switch should be installed correctly: the flow switch MSUT be installed before the electrolysis cell.

Why does my pool say no flow?

The most common reason for low or no flow is that the baskets are full of debris. … *Always turn the pump off before you remove the baskets, if your pool pump is below water level you will need to close the valves in front of the pump and set the multiport valve on the filter to ‘closed’.

How does a pool flow switch work?

A flow switch operates by conveying a trip motion (relay, reed switch, paddle) to another machine within the system, usually a pump. The trip signal will indicate to the pump to turn on or turn off. It is necessary to provide damage protection and circuit cooling or adjust flow rates that are too high or too low.