Freezing or Ice Build Up Inside ChillerUpdated 6 days ago
Ice forming inside your chiller or lines is a sign that water flow is restricted or the water temperature is set too low for current conditions. Ice buildup can prevent proper cooling, damage internal components, and stop water circulation. This guide explains what causes freezing and how to fix it safely.
1. Check Water Flow Immediately
Low flow is the number one cause of freezing inside a chiller.
When flow slows down, water stays inside the cold coil too long and begins to freeze.
Check the following
- the filter is clean
- the filter is not clogged or dark
- the hoses are not kinked
- water is circulating strongly
- fittings are tight
- the intake area has no debris
If flow is weak, ice can form quickly.
2. Clean or Replace the Filter
A dirty filter slows the system enough to cause ice buildup.
Replace or rinse the filter if
- water flow is low
- the filter looks worn or discolored
- you recently filled the tub
- the chiller starts and stops frequently
A clean filter restores flow and prevents ice formation.
3. Raise the Temperature Setting Temporarily
If the water temperature is set extremely low, the chiller may form ice internally.
Raise the temperature slightly to
- melt any forming ice
- reduce coil frost buildup
- allow normal flow to resume
Once the ice clears, you can lower the temperature again slowly.
4. Turn Off the Chiller if Freezing Has Already Started
If you suspect ice build up
- turn the chiller off
- keep water circulating if possible
- let the ice melt naturally
Do not run the chiller with ice inside because it can damage the internal coil or pump.
5. Check for Air Trapped in the Hoses
Air pockets disrupt flow and can lead to freezing.
Lift the hoses gently to release trapped air.
Check for
- bubbling
- sputtering
- uneven flow
Once air is removed, flow should improve.
6. Inspect Hoses for Kinks or Bends
Even a small kink can slow flow enough to cause freezing.
Check the entire length of both hoses for
- twisting
- sharp bends
- hoses pinned under objects
Straighten them fully.
7. Improve Ventilation Around the Chiller
Poor airflow causes the chiller to overwork, which increases the chance of frost forming on the internal coil.
Make sure
- vents are open
- the chiller has clear space on all sides
- the unit is not in a tight corner or cabinet
Good airflow helps defrosting and prevents freezing.
8. Allow Ice to Fully Melt Before Restarting
If your chiller froze internally
- turn it off
- unplug it
- wait for the ice to melt completely inside the unit
- ensure strong water flow before restarting
Restarting before complete melting can lead to repeated freezing.
9. Adjust Ambient Temperature if Needed
If the chiller is in a very cold room or outdoors in winter, the water may freeze faster inside the system.
Move the chiller to
- a warmer indoor location
- an insulated area
- a place with stable temperature
Extreme cold environments increase freezing risk.
10. Restart the Chiller After Fixing Flow
Once flow is strong and ice is melted
- Plug in the chiller
- Turn it on
- Set the temperature gradually
- Monitor flow for several minutes
This helps ensure the system is stable before returning to cold mode.
When to Contact Support
Contact support if
- ice forms repeatedly
- flow remains weak after replacing the filter
- the chiller freezes even at higher temperatures
- you hear unusual noises from the pump
- freezing caused the chiller to stop completely
We are here to help.
Email: [email protected]
Phone: (386) 388-6867