Jandy AquaPure Troubleshooting Guide: Service Codes and Common Problems
The Jandy AquaPure is a salt chlorine generator that uses electrolysis to convert dissolved sodium chloride into sodium hypochlorite (liquid chlorine) for pool sanitation. Available in 700 and 1400 models (APUREM, PLC700, PLC1400), the system includes a control/power center, electrolytic cell with bipolar electrodes, and a combined flow/temperature/salinity sensor. It is compatible with AquaLink RS automation systems.
This guide is written for working pool service technicians. It covers every service code the AquaPure can display, links to detailed troubleshooting articles for each code group, and provides the practical context you need to diagnose problems in the field. Assume you are standing at the equipment pad with the power center door open, a multimeter in hand, and a salt test kit nearby.
Quick Reference: AquaPure Service Codes
Codes 120-123 — Low Chlorine Output
Meaning: Low or extremely low current reaching the electrolytic cell in forward or reverse direction.
Common causes: Worn cell, low salt, dirty cell, cold water.
View detailed guide →Code 125 — Cell Needs Cleaning
Meaning: Scale buildup detected on cell plates, reducing current flow.
Common causes: Hard water, high calcium, imbalanced pH.
View detailed guide →Code 144 — Low Salt Level
Meaning: Salinity below 2.0 gpl. Cell production disabled.
Common causes: Dilution from rain, splash-out, backwash, or insufficient initial salt.
View detailed guide →Code 145 — High Salt Level
Meaning: Salinity above 4.0 gpl. Cell production disabled.
Common causes: Over-salting the pool. Can damage power center above 4.0 gpl.
View detailed guide →Codes 172/175 — Flow Sensor Failure
Meaning: Flow sensor service condition, unplugged sensor, or air lock.
Common causes: Dirty sensor, air in lines, sensor cable damage.
View detailed guide →Codes 126/127/173 — Low Voltage
Meaning: VAC input voltage below 100/200V or on-board power supply unregulated.
Common causes: Incorrect wiring, low utility voltage, transformer issues.
View detailed guide →Code 174 — High Temperature
Meaning: Water temperature above 108°F (42°C) at the sensor.
Common causes: Spa operation, heater overshoot, sensor placement.
View detailed guide →Cell Replacement Guide
When: Codes 120-123 persist after cleaning and salt is correct.
Typical lifespan: Many pool professionals report 3-7 years as a typical range, depending on usage and water chemistry.
View detailed guide →AquaLink RS Integration
Codes: JA, Jb G, EC — external control and automation codes.
Related: RS-485 communication, boost mode, ORP control.
View detailed guide →Complete Service Code Reference
Covers: All Level 1 codes (120-175), Level 2 codes (180-194), and letter codes.
Format: Searchable table with causes and corrective actions.
View full reference →Complete Service Code Table
| Code | Description | Severity | Action |
|---|---|---|---|
120 |
Low current in forward direction to cell | Level 1 | Clean cell, check DC cord |
121 |
Low current in reverse direction to cell | Level 1 | Clean cell, check DC cord |
123 |
Extremely low current to cell | Level 1 | Clean or replace cell, check DC cord |
124 |
Higher than normal current to cell | Level 1 | Contact pool professional |
125 |
Cell needs to be cleaned | Level 1 | Acid wash cell |
126 |
Low forward current + VAC below 100/200V | Level 1 | Contact pool professional |
127 |
Low reverse current + VAC below 100/200V | Level 1 | Contact pool professional |
144 |
Low salinity (below 2.0 gpl) | Level 1 | Add salt to achieve 3.0 gpl |
145 |
High salinity (above 4.0 gpl) | Level 1 | Partially drain and dilute |
170 |
Front board service condition or incorrect wiring | Level 1 | Contact pool professional |
171 |
Backboard service condition | Level 1 | Contact pool professional |
172 |
Flow sensor service condition or unplugged | Level 1 | Check sensor connection, clean sensor |
173 |
Low VAC input voltage / incorrect wiring | Level 1 | Verify wiring and voltage |
174 |
Pool temperature too high (>108°F) | Level 1 | Reduce water temperature |
175 |
Flow sensor air lock or very low salinity | Level 1 | Verify sensor installation, check salt |
180-186 |
Sensor element and temperature probe errors | Level 2 | Contact pool professional |
187-194 |
Power supply, voltage, relay, and cell current errors | Level 2 | Contact pool professional |
AquaPure System Overview
Understanding the components helps narrow down which part is causing the service code:
- Control/Power Center — Converts AC power to low voltage DC (27 VDC) for the cell. Contains the front board (user interface PCB) and back board (power interface PCB). Factory wired for 240 VAC; can be reconfigured for 120 VAC.
- Electrolytic Cell — 3-port design with bipolar electrodes. Produces chlorine via electrolysis when energized with DC current. Auto-reverses polarity every 3 hours for self-cleaning.
- Flow/Temp/Salinity Sensor — Combined sensor installed in the 3rd port of the cell. Detects water flow, measures temperature, and reads salinity in gpl. Must be power-cycled any time it is disconnected.
- 700 Model — 27 VDC at 3A max, produces 0.625 lbs chlorine per 24 hours. For pools up to approximately 25,000 gallons.
- 1400 Model — 27 VDC at 6A max, produces 1.25 lbs chlorine per 24 hours. For pools up to approximately 40,000 gallons.
Key Technical Details
- Optimal salt level: 3.0 to 3.5 gpl (3,000-3,500 ppm). Below 2.0 gpl the cell shuts off automatically. Above 4.0 gpl the cell shuts off and the power center may be damaged.
- Temperature range: Chlorine production stops below 54°F (Lo code). Cell shuts off above 108°F (code 174). Freezing water can damage the cell and sensor.
- Cell reversing: Automatic polarity reversal every 3 hours to remove scale deposits. Does not interrupt chlorine production.
- Boost mode: Press and hold the POOL TEMP/BOOST button for 10 seconds. Runs cell at 100% for 24 hours of operation time, then returns to previous setting.
- Water chemistry: pH 7.4-7.6, alkalinity 80-120 ppm, calcium hardness 175-400 ppm, stabilizer (CYA) 50-75 ppm. Imbalanced water accelerates cell scaling.
- Automation: Compatible with AquaLink RS via RS-485. PureLink models integrate directly into AquaLink power centers.
When To Call a Specialist
- Any Level 2 service code (180-194) indicating internal board, relay, or power supply failures.
- Codes 170 or 171 (front board or backboard service) that persist after power cycling.
- Code 124 (higher than normal current) which can indicate a short in the cell or backboard relay issue.
- Burnt or discolored connectors on the transformer-to-PCB white plug.
- Repeated service codes after cell replacement and confirmed correct salt levels.
- Any situation requiring modification of the 240/120 VAC wiring configuration.