Question about Jandy Laars LX Pool Heater / 400,000 BTU / Natural Gas

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Check airflow sensor on - heater does not fire up

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This means that either the combustion fan has failed, the air switch has failed, or the air switch tubing has failed.

Posted on Nov 15, 2010

Testimonial: "copy that. will start with fan since it does not fire at all right now"

  • Scott Corey-reid Mar 17, 2014

    or theres a blockage in the venting causing restricted air flow



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01 nissan exterra idles erratic at start up and will not stay running after about 20 seconds but will stay running with acceleration so far I have checked all plugs and wires and firing order,fuelfltr

You've got no check engine lights illuminated?
Check your the electrical connections on your MAP sensor/airflow sensor. Try cleaning them if you can.

The symptoms you describe can be applied to a MAP sensor, airflow sensor or EGR valve that needs cleaning.

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If it only switches itself off when the heater is turned on, it is most likely an overheat-temp-sensor that is doing it. If you have had the fireplace for over a year, you may want to do a complete clean/vacuum etc of the unit. A decrease in airflow can lead to the temp sensor tripping. If that does not work, you should contact the dealer for service.

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Heater will not light. Service light comes on after a minute or two and airflow is lot on service panel

Does the pilot light stay light? Or light then go back out? If it is doing that then it is the thermocoupler. looks like a wire that is in the flame of the pilot light. Other than the sparker. That is what dectects that there is fire in the pilot light before it starts the gas. This is a safety thing. Try taking some steel wool or real fine sandpaper and clean up that sensor. It builds up a thin film on it from gas burning.

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I have a 1992 olds 88 runs fine when its cold but when it gets warm it wants to run bad back firing missing ben working on it for weeks replaced mass airflow tps and air sensors also notice that radiator...

replace coolant temperature sensor and go from there!! here are a few causes for engine back fires--common causes are==lean misfire due to low fuel pressure or restricted injectors. breakdown of secondary including internal ignition, coil arching and a dead spot in throttle position sensor. it is hard to say with out being there!! but my first guess would be to check out tps first. then go from there. have a good day!!

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Air flow failure indicated on heater

Mine does the same. Sounds like you checked the air pressure switch, but the high temp switch and bad airflow can also cause this problem. Check the two white wires that lead to the heat sensor vent drain tube exits. Make sure the spade connectors aren't shorted. Try testing the temp sensor like you did the pressure switch to make sure the circuit is properly closing when in use (or use a temporary jumper to bypass as a test.) Check the bottom of the pan for any dust or crud that could block the airflow below or around the burners and last of my options- increase clearance around the unit to aid air flow.

Jun 01, 2010 | Jandy Laars LX Pool Heater / 400,000 BTU /...

1 Answer

Why does my truck back fire? Well It runs really rough check engine light goes off and on it says on the OBD II meter it is the airflow MAP sensor or airflow sensor I replaced both but the problem still...

Well it sounds to me like your about due, if not past due for a timing job. A complete timing service job. If you've just recently had it done, than the problem could be that the timing is off.

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My check engine light has come on in my 2006 Pontiac G6 after 2 and a half years. What could possibly be wrong since I keep my car serviced and the guys had just told me that my car was in tip top shape?

P0016 - Crankshaft Position Camshaft Position Correlation Bank 1 Sensor A
P0030 - Heated Oxygen Sensor (H02S) Heater Control Circuit Bank 1 Sensor 1
P0031 - Heated Oxygen Sensor (HO2S) Heater Circuit Low Voltage Bank 1 Sensor 1
P0032 - Heated Oxygen Sensor (HO2S) Heater Circuit High Voltage Bank 1 Sensor 1
P0036 - Heated Oxygen Sensor (HO2S) Heater Control Circuit Bank 1 Sensor 2
P0037 - Heated Oxygen Sensor (HO2S) Heater Circuit Low Voltage Bank 1 Sensor 2
P0038 - Heated Oxygen Sensor (HO2S) Heater Circuit High Voltage Bank 1 Sensor 2
P0050 - Heated Oxygen Sensor (HO2S) Heater Circuit Bank 2 Sensor 1
P0051 - Heated Oxygen Sensor (HO2S) Heater Circuit Low Voltage Bank 2 Sensor 1
P0052 - Heated Oxygen Sensor (HO2S) Heater Circuit High Voltage Bank 2 Sensor 1
P0053 - HO2S Heater Resistance Bank 1 Sensor 1 (PCM)
P0054 - HO2S Heater Resistance Bank 1 Sensor 2 (PCM)
P0056 - Heated Oxygen Sensor (HO2S) Heater Circuit Bank 2 Sensor 2
P0057 - Heated Oxygen Sensor (HO2S) Heater Circuit Low Voltage Bank 2 Sensor 2
P0058 - Heated Oxygen Sensor (HO2S) Heater Circuit High Voltage Bank 2 Sensor 2
P0068 - Throttle Body Airflow Performance (PCM)
P0100 - MAF Sensor Circuit Insufficient Activity

Jun 25, 2009 | 2006 Pontiac G6

1 Answer

Car will not start. 89 olds 88 replaced fuel pump coil and ignition control modular. still does not get fire.

double check that you get pressure and flow, maybe pump relay. also check the crank and cam sensors along with the mass airflow. some vehicles will not run with faulty airflow sensor. Have you checked for any trouble codes?

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