Chiller Troubleshooting Guide: How to Solve High Temperature Fault?

When your commercial cold plunge chiller displays the EH code, it means your water chiller for ice bath has encountered a high temperature fault.
This fault usually occurs when the water temperature sensor detects a temperature exceeding the F9 set value or if there is a malfunction in the temperature sensor. To ensure safe operation, the cold plunge water chiller will automatically stop running and issue a warning.
But don’t worry—COLDCHILLER provides you with the most comprehensive chiller troubleshooting guide.

Analysis of the Main Causes of High Temperature Failt of Ice Bath Chiller

The main reasons for high temperature failure of commercial cold plunge chillers are water temperature probes that detect water temperatures exceeding the F9 setpoint and temperature sensor failure. Read on to learn more about how these two factors can cause high temperature failures in 1 hp water chillers.

The Water Temperature Probe Detected That the Water Temperature Exceeded the F9 Setting Value

The water temperature probe detected that the water temperature exceeded the F9 (upper temperature limit) setting value. In simple terms, if the actual water temperature of the ice bath tub is 25℃, and the F9 you set is 20℃, the actual water temperature is higher than the upper temperature limit you set, and the ice bath chiller machine will have a high temperature fault.

Temperature Sensor Failure

Loose sensor plug, poor solution, or water ingress to the sensor during refrigeration can cause the temperature sensor to fail, misdetect high temperature, and thus generate a high temperature warning.

How to Deal with High Temperature Fault? Practical Cold Plunge Chiller Troubleshooting Guide

What should you do when facing a high temperature fault? Don’t worry—we’ve gathered the most comprehensive chiller troubleshooting guide for high temperature faults. Just follow COLDCHILLER’s step-by-step video guide, and your cold plunge chiller unit will be back to normal in no time.

Check whether the Water Temperature Exceeds the F9 Set Value

Check whether the water temperature exceeds the F9 set value. If the water tempurature is higher than the value set in F9, you’ll need to adjust the F9 (upper temperature limit) to a value higher than the current water temperature.
Solution: Adjust F9 to 39-42℃.

Check Water Inlet Temperature or Eraporator Internal Tempurature

If you see that the water inlet temperature or eraporator internal tempurature in “Monitor” is negative tens of degrees, it means that the temperature sensor is faulty.
Solution: Set F13 (change 0 to 1, 1 to 0), F20.

Cold Plunge Water Chiller Troubleshooting Detailed Steps: Set F9

Follow the steps below to reset F9. Here we take resetting to 40 as an example. When you finally enter it, you must ensure the F9 value you reset is higher than your alarm value (current water temperature).

• Press the “Setting” button. A new window will pop up.
•  Select the “Parameter” option.
•  Enter the default password “8888” and press “√” to proceed.
•  Locate F09, and reset its value to 40.
•  Press “√”, then click “Return” to go back to the parameter page.
•  In the upper right corner of the parameter page, tap “Confirmed Setting” to save all changes.
•  Finally, press “Return” in the top right corner of the screen again to go back to the main control panel.

How to Setting F13 and F19? Best Ice Bath Chiller Manufacturers Guide

When you confirm that your cold plunge chiller temperature sensor is damaged, you need to set F13 and F19.

Set F13

• Press the “Setting” button. A new window will pop up.
• Select the “Parameter” option.
• Enter the default password “8888” and press “√” to proceed.
• Scroll down to find the F13 code, then click the number in the “Value” column.
• A new window will appear.
• If the current value is “0”, change it to “1”. If the current value is “1”, change it to “0”.
• After entering the value opposite to your current display, press “√”, then click “Return” to complete the setting.

Set F19

Find the F19 row, select the value in the third column.

Click to enter a new window, enter the value “30”, and adjust the temperature difference between the water inlet and outlet to a smaller value. It is worth noting that the temperature unit is Celsius. Click “√”, then click “return” to return to the parameter page.

Click “confirmed setting” in the upper right corner of the parameter page to complete the overall setting.

How to Setting F13 and F20? Best Ice Bath Chiller Manufacturers Guide

When you confirm that your cold plunge chiller unit temperature sensor is damaged, you need to set F13 and F20. The following are the detailed operations.

Set F13

• Press the “Setting” button. A new window will pop up.
• Select the “Parameter” option.
• Enter the default password “8888” and press “√” to proceed.
• Scroll down to find the F13 code, then click the number in the “Value” column.
• A new window will appear.
• If the current value is “0”, change it to “1”. If the current value is “1”, change it to “0”.
• After entering the value opposite to your current display, press “√”, then click “Return” to complete the setting.

Set F20

• Make sure you are still on the parameter page, and scroll down to find F20.
• Click the number in the “Value” column. In the popup window, enter “0” to disable the cold plunge chiller’s temperature difference detection and ignore the temperature variation.
• Press “√” to confirm the setting. Then click “Return” to exit the parameter section.
• Tap “Confirmed Setting” in the upper right corner of the parameter page to finalize all settings.
• Finally, click “Return” in the top right corner of the screen again to go back to the main control panel.

Common Ice Bath Chiller User Setting Errors

If the user does not set it correctly, the high temperature fault cannot be solved correctly. The following are some common user setting errors.

• Skipping the “√” button when setting parameters: If you do not click “√” after entering the value, the entered value is not valid.
• Not clicking the “confirmed setting” button after setting the parameter: If you do not click “confirmed setting” on the parameter page after entering the value, and then directly click “return” to exit the parameter interface, the value will not be saved.
• Not restarting after setting: After the parameter setting is completed, restart the machine to observe whether the machine still alarms. If the operation is correct and the fault cannot be solved, you can contact our team for help.

Commercial Cold Plunge Chiller Maintenance

The maintenance of cold plunge chiller for bathtub can start from several aspects such as installation environment, regular cleaning, regular inspection, etc. Regular maintenance of your commercial cold plunge chiller ensures the normal operation of the chiller, extends the service life of the chiller, and reduces maintenance costs.

Installation Environment

• The air inlet of the cold plunge chiller should be at least 0.5m away from the wall, and the air outlet should be 1.5m away from the wall to ensure air circulation.
• Ensure that the environment around the cold plunge chiller is well ventilated and do not pile up debris. Be careful not to place the chiller in a dusty environment.

Cleaning

• Cleaning the cold plunge chiller filter: Generally, the filter element needs to be cleaned after 10-20 ice baths.
• Cleaning the bathtub inlet and outlet: Foreign matter accumulated in the bathtub inlet and outlet will affect the water flow rate and cause blockage. The bathtub inlet and outlet need to be cleaned in time.
• Cleaning the condenser grid: Clean the condenser grid regularly to prevent excessive dust accumulation and affect the heat dissipation effect.

Check

• Check whether the external power circuit of the cold plunge chiller is damaged.
• Check whether the control panel of the chiller can operate normally.
• Check whether the water chiller for cold plunge has abnormal vibration and excessive noise.
• Check whether the inlet and outlet pipes are broken and cause water leakage.
• Check the internal electronic components of the ice bath chiller to see if they are damaged or loose.

Cold Plunge Maintenance

Here are some simple cold plunge tips. Following these tips can help keep your cold plunge cleaner and more hygienic, providing your gym, spa, or club users with a better cold therapy experience.

• Before taking an ice bath, rinse your body briefly, especially areas prone to sweating such as the feet and back. This helps reduce sweat and skin debris from contaminating the cold plunge water.
• When the ice bath tub is placed outdoors, leaves and other debris may enter the water. Use a small skimmer net to remove any leaves or foreign objects before each session.
• The water in both home cold plunge tubs and commercial cold plunge tubs should be replaced regularly. Generally, after 10–20 uses, it’s time to change the water. Failing to do so may lead to bacterial growth and persistent foam on the water surface.
• For optimal health benefits, the recommended cold plunge temperature is between 10–15°C (50–59°F), with an ideal immersion time of 3–5 minutes. For beginners, start with a slightly higher temperature and shorter duration.

When a high-temperature fault occurs in a cold plunge chiller, it can affect the normal operation of the chiller unit. When the cold plunge chiller unit displays an error code, the first step is to check whether the F09 setting is higher than the water temperature. Next, adjust the F13 and F20 settings. Follow the steps in our chiller troubleshooting guide, and the issue can be resolved quickly.

If you are still unable to fix the fault or encounter other issues, feel free to contact our professional team. We will provide you with detailed chiller troubleshooting solutions.

To learn more about our ice bath chiller products and the latest cold plunge chiller technology, please visit COLDCHILLER or Alphasauna.