Aquapure Error Codes | Quick Fixes And Reset Steps

If your Jandy AquaPure control box is flashing numbers instead of quietly making chlorine, it can feel like the system is speaking a different language. The good news is that these aquapure error codes are not random. Each one points toward a specific issue with flow, salinity, power, or the salt cell, and many of them respond well to a few simple checks.

This article walks through what the most common Aquapure Error Codes mean, which ones you can handle yourself, and when it is smarter to bring in a pool technician. You will see how to read the display, how to reset the unit safely, and which habits keep those service lights from coming back.

Jandy Aquapure Service Codes At A Glance

The Jandy AquaPure system uses two main groups of messages: “Level 1” service codes that often link to routine maintenance, and “Level 2” codes that point to deeper electrical or sensor faults. On the three-digit display, you will usually see numbers such as 120, 121, 125, 144, 172, or 175. Some models also show text alerts such as “Lo” or “HH” for salinity.

Level 1 service codes tend to relate to cell current, salinity, or basic wiring issues. Many owners can clear these by cleaning the cell, correcting salt levels, or fixing flow before asking for help. Level 2 codes usually hint at board problems, failing sensors, or low input voltage and are better handled by a qualified pro who can test live power safely.

The control center does not try to guess every detail of the failure. Instead, it measures current, voltage, temperature, and flow at a few key points, then turns those readings into Aquapure Error Codes that narrow the search. Once you know what each code stands for, the display becomes less of a mystery and more of a checklist.

Most Common Aquapure Error Codes And What They Mean

Jandy publishes a full list of service codes in the AquaPure installation and troubleshooting manuals, along with suggested actions. The table below pulls out the codes most pool owners see during a normal season and pairs them with simple starting points.

Code	What It Means	First Things To Try
120 / 121	Low cell current forward / reverse	Clean the cell, check DC cord plugs for corrosion
123	Very low or no current to cell	Inspect and clean cell, confirm cord is firmly seated
124	High current to cell	Call a technician to test boards and cell health
125	Cell needs cleaning or is near end of life	Deep clean the cell; if code returns, plan for replacement
144	Low salinity in the pool water	Confirm salt with a reliable test; add salt as needed
145	High salinity in the pool	Verify salt level; dilute by draining and refilling a portion
170 / 171	Front or back board service condition	Check supply voltage; have boards tested by a pro
172	Flow sensor service or unplugged	Clean the tri-sensor, check cable, confirm proper install
173	Low input VAC or wiring issue	Confirm correct line voltage and wiring to the unit
174	Water at sensor above safe temperature	Lower heater setting or bypass heater until water cools
175	Flow sensor air lock or very low salt	Bleed air from system, verify salinity, correct plumbing if needed

Codes that begin with 12x generally relate to current flowing through the salt cell. When they appear, the system is telling you that the cell is not drawing the expected amperage in one or both directions. Heavy scale, a worn cell, a loose DC cord, or failing boards can all lead to this pattern.

Codes 144 and 145 are tied to measured salinity. The unit measures salt through the tri-sensor; if the reading drops below about 2.0 g/L, you see low salt, and if it rises above roughly 4.0 g/L, you see high salt. Both conditions strain the system and can shorten cell life. Always cross-check the reading with an independent test before taking action.

Codes 170, 171, 172, 173, 174, 175, and the higher 18x codes in the manual tie together as a group. They cover front and back board health, the flow and salinity sensor, and situations where power into the unit is weak or unstable. These often need more than a quick reset because they reflect what the electronics see over time, not just one bad moment.

Aquapure Error Codes Quick Checks Before You Call For Help

Before you reach for a screwdriver or schedule a service call, run through a short checklist. These steps are safe for most pool owners and clear a huge share of everyday aquapure error codes.

• Confirm Power And Mode — Make sure the breaker is on, the AquaPure control has power, and the system is not set to “Off” or “Standby.”
• Check Pump And Flow — Verify the circulation pump is running and that valves are set so water passes freely through the cell and sensor.
• Review Salt Level — Use test strips or a digital meter to check salinity. Aim for the range recommended in the manual, often near 3000–3500 ppm.
• Inspect The Cell Visually — Shut off power at the breaker, remove the cell, and look for white scale or debris on the plates.
• Rinse Off Light Scale — Hose away loose buildup and any small bits of organic debris stuck between plates.
• Check Cords And Plugs — With power still off, look at the DC cord and sensor plugs for broken pins, corrosion, or loose fits, then reseat them firmly.
• Perform A Simple Reset — Turn the system off, wait a minute, then power it back up and re-start the chlorinator to see if the code returns.

If a code clears after these steps and stays away for a day or two, you likely caught a minor issue such as a momentary air pocket, a dirty cell, or a short spike in voltage. If the same Aquapure Error Codes pop back up quickly, treat that as a hint that something deeper needs attention.

Step-By-Step Troubleshooting For Persistent Service Codes

When codes keep returning in spite of basic checks, narrow the problem by grouping them. Different sets of service codes line up with the salt cell, the tri-sensor, or the power boards. Use the sections below to match what you see on the display.

Codes 120, 121, 123, 124, 125: Cell Current Problems

These codes share one theme: the current flowing through the cell is outside the normal window. Low current suggests scale or a worn cell. High current can point toward a board problem or a shorted plate.

• Clean The Cell Properly — Use a manufacturer-approved acid wash or cleaner at the recommended strength, never stronger than the instructions allow.
• Check For Plate Damage — After cleaning, look for warped, pitted, or missing coating on the plates; this often means the cell is near the end of its life.
• Confirm Cell Type Setting — On combo systems, open the menu and verify that the control is set to the correct cell model, such as “1400,” so it expects the right current draw.
• Inspect The DC Cord — Look for burned spots, stiff sections, or cracked insulation; replace the cord if you see damage.
• Call A Technician For Voltage Tests — If codes 120, 121, 123, or 124 stay on after a fresh cell and cord, have a pro measure DC output and board health before replacing more parts.

Codes 172, 175, 180–186: Flow And Tri-Sensor Issues

The tri-sensor handles flow, temperature, and salinity. When it loses contact with water, runs full of air, or starts to fail, the control responds with 172, 175, and level 2 codes 180 through 186.

• Verify Sensor Orientation — Check that the arrow on the body of the sensor points in the same direction as water flow through the pipe.
• Bleed Trapped Air — Open any air relief valve on the filter, then run the pump until a solid stream of water comes out and air noises fade.
• Clean The Sensor Face — Remove the sensor and gently wipe buildup from the probes with a soft cloth or plastic pad; avoid metal tools that can scratch the surface.
• Check Cable Routing — Make sure the sensor cable is not pinched, stretched tight, or chewed by pests, and that the plug is fully seated at the control.
• Plan For Replacement If Codes Return — Repeating 172, 175, or 18x codes after cleaning usually means the tri-sensor is failing and needs to be replaced by a qualified technician.

Codes 170, 171, 173, 187–190: Power And Board Problems

These codes are the system’s way of saying that input power, internal voltage, or relay behavior is outside normal range. The control may still run for a while, but it is warning you that something on the front or back board is not healthy.

• Confirm Line Voltage — Have a qualified person verify that the supply voltage matches the unit label (for example 120 V or 240 V) and does not sag heavily under load.
• Look For Heat Damage — With power off and covers removed by a pro, boards should be checked for dark spots, swollen components, or burned traces.
• Test Relays And Transformers — A technician can measure AC and DC outputs at the test points listed in the AquaPure troubleshooting manual to see whether parts still meet spec.
• Replace Boards When Needed — Once power issues are confirmed on the bench, the usual fix is a new front board, back board, or both, followed by a full function test.

Display Messages Such As “Lo” Or “HH”

Besides numeric aquapure error codes, the display can show text such as “Lo” for low salinity or “HH” for salinity or temperature so high that the unit cannot read it reliably.

• Confirm Readings With A Test — Always cross-check “Lo” or “HH” with a separate salt or temperature test before changing water chemistry.
• Adjust Salt Gradually — Add or remove salt in stages, letting the system circulate between changes, rather than trying to fix the reading in one big move.
• Watch Heater Settings — If water at the sensor is too hot, lower the heater setting or run the pump longer after heating to cool water before it reaches the cell.

When Aquapure Error Codes Point To Salt Cell Replacement

Salt cells do not last forever. Depending on pool size, hours of operation, water balance, and cleaning habits, a Jandy AquaPure cell often works well for three to seven seasons. Over time, the coating on the plates wears, and the cell needs more voltage to deliver the same current.

Certain patterns of aquapure error codes are strong clues that the cell is nearing the end of its life. Repeating 120, 121, 123, or 125 codes after careful cleaning, correct salinity, and healthy wiring often fit this picture. If you also notice weak chlorine production, frequent “Low Salt” messages that do not match independent tests, or visible plate wear, it is time to talk about replacement rather than endless cleaning.

• Match The Correct Cell Model — Use the cell size specified for your power center, such as AquaPure 700 or 1400, to keep output and service codes accurate.
• Shut Off Power Before Swapping — Turn off the breaker, verify that the control is dark, and only then loosen unions and unplug the cell.
• Check O-Rings And Unions — Inspect and lubricate O-rings, and make sure unions sit squarely when you install the new cell to prevent leaks.
• Update System Settings — In the control menu, confirm that the cell type matches the new hardware so the unit uses the right current and voltage targets.
• Monitor First Week Of Operation — Watch the display for any new service codes and confirm that chlorine levels in the pool settle into a normal range.

Preventing Future Aquapure Error Codes With Simple Maintenance

The easiest way to live with aquapure error codes is to see them rarely. A steady routine for water balance, flow, and cleaning gives the control panel less to complain about and stretches the life of both cell and boards.

• Check The Panel Weekly — Take a quick look at the display each week to confirm output percentage, salinity reading, and the absence of new codes.
• Keep Water Balanced — Maintain proper pH, alkalinity, stabilizer, and calcium levels so scale and corrosion stay under control and sensors read accurately.
• Clean The Cell On A Schedule — Rinse monthly and perform a mild acid wash only when scale is present, following the manufacturer’s strength and soak time.
• Maintain Stable Salinity — Test salt every few weeks during the swimming season, topping up after heavy backwashing or splash-out.
• Protect The Equipment Pad — Keep the control box shaded from direct sun and shielded from heavy rain so boards and displays stay dry and cool.
• Watch Pump Run Time — Make sure the pump runs long enough each day for the AquaPure to generate the chlorine your pool needs.
• Schedule A Periodic Pro Check — Every so often, have a technician review wiring, grounding, and board health, especially before peak season.

Once you understand how Aquapure Error Codes translate into real-world issues, the flashing numbers feel less like a crisis and more like a status report. With regular maintenance, careful salt management, and timely help from a pool professional when deeper electrical problems arise, your AquaPure system can stay reliable season after season.