Hot Tub Error Code Guide
COOL / ICE, Cold Water / Freeze Codes
ImportantThe water is well below setpoint (COOL) or the spa detected freezing-risk conditions (ICE) and is protecting itself.
Call 385-588-7757 for Fast RepairWhat Does COOL / ICE Mean?
COOL (or COOLING) means the water temperature has fallen a set number of degrees below the setpoint — often shown while the spa works to recover heat. ICE (or a snowflake / freeze indicator) means the system detected near-freezing conditions and activated freeze protection by running pumps to keep water moving.
On their own these codes aren't always a failure — a spa recovering after a cold snap or a refill can show COOL temporarily. The concern is when the water keeps dropping, which means heating isn't keeping up.
Also searched as: COOL, COOLING, ICE, SNO, cold hot tub code, freeze protection.
Most Common Causes
- Normal recovery after a refill, a power outage, or the cover being left open
- An underlying heating failure (flow error, bad element, or sensor) preventing recovery
- A worn or waterlogged cover bleeding heat faster than the heater can replace it — common at altitude
- Undersized heating for extreme cold, or a spa in economy mode
- Freeze protection cycling because ambient temperatures are dangerously low
What You Can Safely Check First
- 1
Confirm the cover is sealed and in good condition — a saturated cover is a major heat leak in Utah winters
- 2
Check for any accompanying code (FLO, SN, OH) that explains why heat isn't recovering
- 3
Verify the spa isn't in a sleep/economy mode that caps heating hours
- 4
Make sure the filter is clean so the heater gets full flow
- 5
If water keeps dropping despite a clean filter and sealed cover, treat it as a heating failure and call
Brand-Specific Notes
Different brands display cold-water conditions differently — a snowflake icon, ICE, COOL, or SNO. The freeze-protection logic is similar across Balboa, Bullfrog, and Hot Spring systems: keep water moving to prevent freezing. What matters is whether the spa can still reach setpoint, which is what we test.
How Urgent Is It?
In Utah mountain climates, a spa that can't hold temperature is a freeze risk. If freeze protection is running but the water keeps falling, or an ICE code appears with a non-circulating pump, call promptly — cracked plumbing is a far bigger repair than a heater.
COOL / ICE FAQs
Is a COOL code on my hot tub normal?
It can be — after a refill, outage, or open cover, a spa may show COOL while it recovers heat. It's only a problem if the temperature keeps dropping instead of climbing back to setpoint.
What does the snowflake / ICE symbol mean?
It's freeze protection — the spa detected near-freezing conditions and is circulating water to prevent it from freezing. Make sure the spa is actually heating too; freeze protection alone won't keep a mountain spa warm enough to use.
Still Seeing COOL / ICE?
Send us your spa brand and the code, we'll diagnose the root cause and bring the right parts.
Other Hot Tub Error Codes
COOL / ICE on your display? Let's fix it right.
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