Jandy Laars LX Pool Heater / 400,000 BTU / Natural Gas - Answered Questions & Fixed issues

AGS - Auto Gas Shutoff = Because of a problem sensed, the gas valve is closing, stopping gas supply and hence heater shutoff. Improper water flow through heater! Check filter, pump, water supply lines, anything that will reduce water flow into heater. A faulty Pressure Switch may cause this problem as well. or... In coming water to heater is over 104° If all is good with the above, replace the AGS Switch.

Try cleaning your filter. The filter will be the main and most common reason a pressure switch will sense restriction, and therefore throw a fault.

Brand New ... call the installer and have him or her repair it.

check to see if fusible link is good then check hi limits they are by the plumbing inlets

check safety circuit and see if high limits are corroded also see if fusible links are tripped

try setting heater all the way to 104 the aqualink should control the heat

check flame sensor

see PDF attached

just replace and hook up unless system is alot higher than pool or in a basement if so call a professional to adjust

remove gas line then remove screws to the bottom front it should pull out

remove vent clean out and put back together

check to see if power control board is burned or pop the back off the fenwal to see if burned spot where ignitor plugs in

jump highlimit to see if it lights if so replace

Hi do you have any error codes and did you check the safty loop for voltage?

Jandy Laars Lite2 Hot Surface Igniter Replacement Laars Lite2 LJ Heaters 2003 Present Pg 1

check safety circuit

it shows that the filter pump is working and that you have water flow through the heater

check by where the pipes go into the heater there are two wires a low high limit and a high high limit make sure those arent bad or a pinched wire

Bad design, KIS keeps doing complete HD scans weekly when I told it to only do so manually. KIS is badly designed as is your equipment.

At 95 I assume you are heating a Spa. I am only heating a pool but I found my answer to same error code was related to reduction in water recycle when my scimmer fap became stuck preventing free flow of water. I would check to see that you don't have some obstruction in your pumping system. A second check might be to make sure your electrical connection to your thermostate is not loose or corroded which might cause the thermostate to not register proper temperature settings.