How does a hot tub high limit switch work?
If it senses that the spa water has reached 110 or 120 degrees, the switch trips and your heater (and often the pump, too) turns off. Your high limit switch measures the water temperature by either a capillary tube attached to a bulb or a mounted sensor.
What is a high limit switch on a hot water heater?
The high limit switch senses the water temperature with a capillary tube that is then attached to a bulb. This is all housed in a THERMOWELL. Another type of high limit switch is a mounted sensor, often referred to as a THERMODISC.
Why is my hot tub heater Tripping the high limit thermometer?
If you’re having issues with your hot tub heater, it may be related to the high limit switch (also known as the high limit thermometer). Certain conditions can cause the switch to trip more than it should.
What happens when a hot tub switch is tripped?
A tripped switch cuts the power BEFORE the fuse to stop the function of the heater as well as the hot tub pump. In older systems, this may only cut power to the heater when tripped. The high limit switch senses the water temperature with a capillary tube that is then attached to a bulb.
How do you adjust a high limit switch on a hot tub?
The High Limit Switch Needs to Be Reset or Replaced Simply reset by pressing the big red button on your spa pack. The high limit switch may be housed in a thermowell. If the water temperature in the thermowell is the same as the water temperature in the rest of the spa, the switch is damaged and needs to be replaced.
What causes HL code on hot tub?
When “HL” error message displays, it means the system shut the heater down because temps at the heater reached 119ºF (48ºC). When “HL” error message is flashing, it means the system shut down because the water temps in the spa reached 112ºF (44ºC). In this condition, only Smart Winter Mode will remain active.
How do you test a high limit sensor on a hot tub?
Testing Spa Temperature SensorsShut off all power to the spa at the breaker and spa pack.Set your Ohm meter to the 20K setting.Locate the wire ends and remove the plug from the board.Place your meter leads onto the green and red wire.Compare readings to Thermistor Resistance vs. Temperature Chart.
What is high limit switch?
The high temperature limit switch (also known as a furnace plenum thermostat) is a safety device on a furnace that is designed to cut the gas supply when the burner temperature exceeds the safe operating range. When the temperature drops back within the safe range, it will allow the gas valve to open again.
How do I fix the HL error on my Arctic Spa?
HL. The system has shut the heater down because the temperature at the heater has reached 119ºF (48ºC). Do not enter the water! Remove the spa cover and allow the water to cool down, then the shut power off and power your spa up again to reset the system.
How do you fix the error code on a hot tub?
0:112:26Fix a Flow Sensor Error on Your Hot Tub and Fix Your Spa Not HeatingYouTubeStart of suggested clipEnd of suggested clipTurn your spa off and put the filter in finally turn your spa back on again and run your jets for aMoreTurn your spa off and put the filter in finally turn your spa back on again and run your jets for a few minutes. This should remove any air that's in your lines.
Where is the high limit reset button on my hot tub?
Another type of high limit switch is a mounted sensor, often referred to as a THERMODISC. 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.
What is a high limit sensor?
Sometimes also called a hot tub high limit sensor or simply a high limit sensor, this is a safety feature built into all hot tubs that prevents them from overheating. It keeps the temperature from exceeding 120°F (49°C) in most cases.
How do I fix HL error on Cleverspa?
An HL error usually means there is a blockage, preventing water from circulating around the pump & heating system....Turn off the heater.Remove the Filter sock and Filter.Place the filter sock over the filter inlet.
How do I know if my high limit switch is bad?
One of the most common issues that happens when a high limit switch goes bad is that it fails to signal the blower fan to turn off. If your fan keeps running continuously (and you've checked that your thermostat is set to AUTO rather than ON), that could be a sign of a bad high limit switch.
What causes high limit switch trip?
If the air inside your furnace gets too hot, the limit switch trips to prevent overheating. If the furnace high limit switch trips due to overheating, there is likely an airflow issue that is preventing proper air movement through the system. Check your air filter, and replace it if dirty.
What does the high limit switch look like?
2:3718:59HVAC Furnace Short Cycling - How High Limit Switch Works - YouTubeYouTubeStart of suggested clipEnd of suggested clipPosition that will open up that switch and interrupt the power from going through the limit switchMorePosition that will open up that switch and interrupt the power from going through the limit switch does the same thing but it's automatic.
What does Dr code mean on hot tub?
Water Level A message such as “dr” or “dry” or “heater dry” is a warning that there's no water in the heater tube, says Niagara Hot Tubs. Although safety sensors are supposed to detect a dry condition and shut off the heater, be sure to manually disconnect power to the pump and heater before troubleshooting the unit.
What does FLC mean on a hot tub?
Flow switch openThe other one is FLC. Flow switch open, flow switch closed. The purpose of your pressure switch is to measure pressure in the line when your pump is running.
Where is the high limit switch in a spa?
The high limit switch may be housed in a thermowell. If the water temperature in the thermowell is the same as the water temperature in the rest of the spa, the switch is damaged and needs to be replaced.
Why does my hot tub trip the high limit switch?
If air remains in the plumbing system after you fill the hot tub it could trip the high limit switch. If the issue occurs each time you drain and refill, that is the probable cause. This issue will likely resolve itself when the air is out of the lines.
How to reset high limit switch?
Or it might need a reset from time to time for no known or serious reason. Simply reset by pressing the big red button on your spa pack. The high limit switch may be housed in a thermowell.
What causes calcium buildup in a high limit switch?
The resulting low water flow can impact the high limit switch functioning.
How to get hot air out of spa?
Try adding some cool water (according to filing and treatment instructions) or shifting the spa cover to let hot air out. Adding very hot or boiling water is not recommended. Even if you want to increase the temperature faster, never add water to the spa in ways that different from the manufacturer’s filling instructions. ...
Hot Tub High Limit Switch Location
Most people don’t bother looking for the high limit switch as long as their spa is working fine, and why would they? Most of us don’t bother tinkering with their hot tubs as long as everything is going smoothly.
Hot Tub High Limit Switch Troubleshooting
The high limit switch has a built-in circuit breaker that automatically breaks the circuit so that electricity doesn’t reach the heater. Here are some of the many reasons why the switch may flip.
Why is my hot tub high limit tripping?
When troubleshooting the high limit switch, it is important to realize that either something is wrong with your hot tub causing it to overheat or other circumstances have caused your high limit to trip without the temperature getting that hot. If you recently drained your hot tub, the high limit tripping may only be a temporary problem ...
How to reset a spa thermostat?
1) Reset the high limit switch. This is done by pressing the large red button on your spa pack. 2) Check your spa thermostat. It may be calibrated too high or it may not open the circuit when the set temperature is reached.
What temperature should a thermal well trip?
It should trip between 110 and 120°F. If the temperature inside the thermal well is higher than the spa water, check for calcium build-up on the thermal well. If there is excessive scaling on the inside of the thermal well, replace the part. Low flow rate can also cause a higher temperature reading in the thermal well.
Where Is The High-Limit Switch Located on A Hot tub?
What Does It do?
- The high-limit switch helps to ensure a high safety level as you use your equipment. The high limit switch helps to break the circuit once the temperature of the water is becoming unsafe. Hence, it discontinues the reach of electricity to the tub heater.
Troubleshooting?
- Troubleshooting is always a valid option to explore when your limit switch does not function. Also, you can try troubleshooting to solve different problems that could arise. For example, you can troubleshoot to calibrate the thermostat properly. After that, you can check if the problem is fixed. Troubleshooting should be the basic consideration when you are experienced with electrical sys…
Final Thoughts
- The high limit switch of a hot tub is critical for the equipment. It is wrong to ignore such a problem no matter how little it may appear to be. Also, ignoring such an issue can cause more damages to the hot tub generally. Repairing the heater by then would make one spend more money or even replace the entire hot tub. You can always replace the high limit switchtoo if need be. Hence, it i…