🏊Pool Heater

AGS

Jandy · LXi 400,000 BTU Low NOx Pool and Spa Heater

Jandy LXi 400,000 BTU Low NOx Pool and Spa Heater AGS Error Fix: Air/Gas Switch Fault

The air/gas pressure switch detected an abnormal condition — monitors both combustion air and gas manifold pressure; check gas pressure (natural gas ~3.5 inches WC, LP ~11 inches WC), check combustion blower operation, check vent system; may require professional gas pressure adjustment

Medium severity2 fixes available✨ Free fix available

Quick Answer

Error AGS on the Jandy LXi 400,000 BTU Low NOx Pool and Spa Heater means: Air/Gas Switch Fault. The top-ranked community fix is “Test and Adjust Gas Pressure and Replace Air/Gas Pressure Switch” (hard difficulty, ~90 min, DIY cost: $10-$25). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · pool heater

Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.

When to Call a Professional

While many pool heater repairs can be done safely at home, consider hiring a qualified technician if:

The repair involves electrical wiring, gas lines, or refrigerant
You've tried the top-ranked fix and the error persists
You smell gas, see sparking, or notice water leaking
The repair requires specialized tools you don't have
Your appliance is still under manufacturer warranty

Average professional repair cost for this issue: $220-$400.

Other Jandy Models with Error AGS

JXi 260 260,000 BTU Pool Heater with High Efficiency and Digital Temperature Control

pool_heater · 2 fixes

JXi 400,000 BTU Pool and Spa Heater with Digital Temperature Control

pool_heater · 2 fixes

Other Jandy LXi 400,000 BTU Low NOx Pool and Spa Heater Error Codes

AFC

Airflow Current Fault

Communication Error

Flue Exhaust Fault

Flow Fault — Insufficient Water Flow

2 fixes

Gas Valve Fault

2 fixes

HLS

High Limit Switch Tripped

Ignition Failure

Polymer Header Crack (LXi-Specific)

2 fixes

People Also Ask About Jandy LXi 400,000 BTU Low NOx Pool and Spa Heater Error AGS

What does error code AGS mean on a Jandy LXi 400,000 BTU Low NOx Pool and Spa Heater?

Error code AGS on the Jandy LXi 400,000 BTU Low NOx Pool and Spa Heater means: Air/Gas Switch Fault. The air/gas pressure switch detected an abnormal condition — monitors both combustion air and gas manifold pressure; check gas pressure (natural gas ~3.5 inches WC, LP ~11 inches WC), check combustion blower operation, check vent system; may require professional gas pressure adjustment

How do I fix error code AGS on my Jandy LXi 400,000 BTU Low NOx Pool and Spa Heater?

The most successful fix is "Test and Adjust Gas Pressure and Replace Air/Gas Pressure Switch" (hard difficulty, ~90 minutes). Estimated DIY cost: $10-$25. HomeMD has 2 community-ranked fixes for this error.

Is error code AGS on a Jandy LXi 400,000 BTU Low NOx Pool and Spa Heater serious?

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Can I fix Jandy LXi 400,000 BTU Low NOx Pool and Spa Heater error AGS myself?

Yes — the top-ranked community fix ("Test and Adjust Gas Pressure and Replace Air/Gas Pressure Switch") is rated hard difficulty and takes about 90 minutes. Tools needed: T20 Torx screwdriver, Manometer, Multimeter.

How much does it cost to repair Jandy LXi 400,000 BTU Low NOx Pool and Spa Heater error AGS?

DIY cost: $10-$25. Professional repair typically costs $220-$400. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Jandy LXi 400,000 BTU Low NOx Pool and Spa Heater have?

The Jandy LXi 400,000 BTU Low NOx Pool and Spa Heater has 8 other known error codes, including: AFC (Airflow Current Fault), CE (Communication Error), FE (Flue Exhaust Fault), FLO (Flow Fault — Insufficient Water Flow), GV (Gas Valve Fault), and 3 more.

Which other Jandy models have the AGS error?

Error code AGS also appears on 2 other Jandy models: JXi 260 260,000 BTU Pool Heater with High Efficiency and Digital Temperature Control, JXi 400,000 BTU Pool and Spa Heater with Digital Temperature Control. The fix may vary by model, so check each model's specific page for tailored repair steps.

What other error codes does the Jandy LXi 400,000 BTU Low NOx Pool and Spa Heater have?

The Jandy LXi 400,000 BTU Low NOx Pool and Spa Heater has 8 other known error codes:

AFC — Airflow Current Fault (2 fixes)
CE — Communication Error (2 fixes)
FE — Flue Exhaust Fault (2 fixes)
FLO — Flow Fault — Insufficient Water Flow (2 fixes)
GV — Gas Valve Fault (2 fixes)
HLS — High Limit Switch Tripped (2 fixes)
IGN — Ignition Failure (2 fixes)
MECH-01 — Polymer Header Crack (LXi-Specific) (2 fixes)

Which other Jandy models have the AGS error?

Error code AGS also appears on 2 other Jandy models:

JXi 260 260,000 BTU Pool Heater with High Efficiency and Digital Temperature Control (pool heater) · 2 fixes
JXi 400,000 BTU Pool and Spa Heater with Digital Temperature Control (pool heater) · 2 fixes

Ad Space — banner

Replace ADSENSE_PUBLISHER_ID in AdUnit.tsx