Jandy TruClear Troubleshooting Guide: Common Problems and Fixes
The Jandy TruClear is an inline salt chlorine generator designed for residential pools up to 35,000 gallons. It uses a reversible-polarity electrolytic cell powered by a separate power pack that wires to your pump timer circuit. The system accepts 120 or 240 VAC input, requires a minimum flow rate of 20 GPM, and operates at a target salt level of 3,000 ppm. Maximum chlorine output is equivalent to 420 grams of free available chlorine per day.
This guide is written for working pool service technicians. It covers the most common problems you will encounter on the TruClear in the field, links to detailed troubleshooting articles for each, and provides the practical context you need to diagnose issues efficiently. The TruClear is a simpler system than the Jandy AquaPure — no salinity sensor readout, fewer menu options, and a straightforward LCD display that tells you exactly what the system is doing or why it stopped.
Common Problems at a Glance
Low Chlorine Output
Symptoms: Pool chlorine reads below 1 ppm despite the system running. Output percentage seems adequate but residual stays low.
Common causes: Low CYA, dirty cell, low salt, insufficient run time, high bather load.
View detailed guide →Cell Cleaning
Symptoms: Scale visible on cell plates, reduced output, "Lo Temp/Lo Salt" warning even with correct salt levels.
Common causes: High calcium hardness, pH above 7.6, hard water area, insufficient polarity reversal frequency.
View detailed guide →Salt Level Problems
Symptoms: "Lo Temp/Lo Salt" display, salt LED illuminated, or corrosion from over-salting.
Common causes: Insufficient salt added, dilution from rain or backwash, over-salting, inaccurate testing.
View detailed guide →Flow Issues
Symptoms: "No Flow" on display, system shuts off chlorine production, intermittent operation.
Common causes: Dirty filter, closed valves, undersized pump speed, air in system, cell installed incorrectly.
View detailed guide →Cell Replacement
Symptoms: "Check Cell" display, cell no longer produces chlorine at any output level, visible plate erosion.
Common causes: End of cell life (typically 3–5 years), chronically low salt, poor water chemistry, excessive acid washing.
View detailed guide →TruClear Display Readings Reference
| Display | Description | Output Status |
|---|---|---|
Standby |
System ready, waiting for next chlorination cycle | OFF |
Standby ‡ |
Connected to Jandy Automation via RS485, waiting | OFF |
Starting... |
Filter pump detected, initiating chlorine production | Starting |
Chlorinating |
Normal operation, producing chlorine | ON |
Cleaning |
Polarity reversal in progress (normal cycle) | OFF (temporary) |
Lo Temp/Lo Salt |
Low water conductivity — cold water, low salt, or both | ON |
No Flow |
Insufficient water flow through the cell | OFF |
Check Cell |
Cell short circuit, overload, open circuit, or disconnection | OFF (retries every 30s) |
Over Temp |
Controller internal temperature exceeds 80°C | OFF |
TruClear System Overview
Understanding the TruClear's design helps you troubleshoot faster:
- Power pack: Wall-mounted control unit. Accepts 120/240 VAC, draws approximately 4A at 120V or 2A at 240V. Must be wired to the LOAD side of the pump timer so it only operates when the pump runs.
- Electrolytic cell: Installed inline as the last piece of equipment before the pool return, on a minimum 16-inch horizontal pipe segment. Cell must be mounted horizontally with the cable facing up.
- Flow detection: Internal flow sensor in the cell. This is a backup only — the primary flow interlock is the electrical connection to the pump timer.
- Polarity reversal: Automatic, configurable at 3, 5, or 7 hour intervals. Default is 5 hours. In hard water areas (TH above 400 ppm), reduce to 3 hours.
- Output control: Adjustable from 10% to 100% in 10% increments. BOOST mode runs at maximum for 24 hours. LOW mode minimizes output indefinitely.
- Salt requirement: 3,000 ppm target. Below 2,500 ppm causes premature cell failure. Above 6,000 ppm risks corrosion damage to pool fixtures.
- Temperature limits: Do not operate below 55°F (13°C). Very little chlorine is needed in cold water and cold operation dramatically shortens cell life.
- Maximum pool size: 35,000 gallons (132,000 liters).
- RS485 automation: Slide-out RS485 connector for integration with AquaLink automation systems. When connected, full control transfers to the automation controller.
Optimum Water Chemistry for the TruClear
Maintaining proper water balance is essential for cell longevity and effective chlorine production:
- Free Chlorine: 1–3 ppm
- pH: 7.4–7.6 (critical — above 7.6 causes calcium plating on cell; below 7.4 dissolves metal components)
- Salt: 3,000 ppm
- Cyanuric Acid: 30–50 ppm (outdoor pools only)
- Total Alkalinity: 80–120 ppm
- Calcium Hardness: 200–400 ppm
- Metals: None (iron and manganese cause chlorine loss and staining)
- Nitrates: None (can drive chlorine to zero)
- Phosphates: None
- Water Temperature: Above 60°F (16°C) for operation
When to Call for Help
- "Check Cell" that persists after cleaning, inspecting connections, and confirming proper salt and flow. The cell may have reached end of life or the PCB may need replacement.
- "Over Temp" that recurs. The power pack may be in direct sunlight or have an internal component failure. Relocate or replace the power pack.
- Any electrical issue including GFCI tripping, no display on the LCD, or burnt wiring. These require a licensed electrician.
- Persistent low chlorine after verifying salt, CYA, cell condition, run time, and output percentage. The pool may have a contamination issue (nitrates, metals, or phosphates) that requires professional water analysis.