What It Means
High Limit Fault
Likely Causes
- Insufficient water flow to heat exchanger
- Filter pressure high / dirty filter
- Closed valves restricting flow
- High limit switch tripped or failed
- Scale in heat exchanger tubes
Next Checks
- Verify pump running at adequate flow rate
- Backwash or clean filter
- Open all return valves fully
- Allow 15-minute cooldown before reset
- Inspect heat exchanger for scale; descale if flow history shows inadequate water treatment
Verify Before Repair
SplashLens is a field reference, not a repair guarantee. Confirm the visible code, exact model, and current manufacturer procedure before replacing parts, bypassing safeties, or quoting a customer.
SplashLens is independent and is not affiliated with Jandy / Zodiac or other equipment manufacturers.
Use SplashLens At The Pad
Manual error-code lookup works after the app has loaded once. AI scan features require internet and should be treated as a second set of eyes.