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

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When I turn on the heater by setting the control to pool and adjust the temp I wait for the fan to start and nothing happens when I open the front panel none of the trouble shouting lights come there is power

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Is the filter clean ? the heater off line or control by the thermostat

Posted on Sep 11, 2009

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Posted on Jan 02, 2017

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Jamdy RS Shuts off heater too soon

when using the aqualink make sure heater is in tstat mode if not for your heater then turn heater all the way up make sure the wires are connected to pool and com then make sure the wires 5and 6 are connected to the heater then the aqualink will command heat if the red light is lit on controller

Feb 10, 2014 | Jandy 7953 AquaLink RS One Touch Control...

1 Answer

My Spa has a Balboa 500z Top side and control panel. It was running at 104 degrees and then one day it just shut down. The Circ pump won't start up at all and when I first turn on the power, I hear the...

Turn breaker power off. Verify now power to unit with volt meter. Most systems have in line over temp over current to protect circuit board and motor. Also the water level switch must be made to complete interlock condition. Check the heater coil for continuityas it may have opened. Check heater for continuity to each coil set. There is an interlock that is for diagnostics on start up that will prevent unit from starting. Look for any melted wires or components too. Always know and verify breaker settings. Verify your meter with known voltage reading first. Be safe my friend.

Jun 04, 2017 | Balboa Instruments Pool & Spa

1 Answer

Laars pool heater wont start.

check safety circuit starting with pressure switch if voltage on both sides ok if not check pressure switch if ok check copper tubing it gets clogged at header

Mar 27, 2013 | Jandy Laars Lt 400,000 Btu Heater

1 Answer

I have a white Rodgers ac thermostat and the temperature in my apartment stays on 88 no matter how low I set the temp. If I turn it off, of course it gets even hotter. This started happening when I pressed...

I'm not quite sure I understand what you have done but, make sure your compresor(outside is running and, that you don't have the thermostat set to "fan". You want the display to show "cool" and then adjust your temp. It sounds like you have the system set to fan and not cool. Provide me with a model number and I will see about getting you a manual.

Jun 04, 2011 | White Rodgers 0754-1 Electric Water Heater...

1 Answer

Max therm 33300 btu temp is set at 98 but turns off at 94

What do you use to control it? If it's a separate controller (not the one on the heater) than these are adjustable temp. wise. You have to claibrate it. If you are using the controller on the heater than your thermostat is the most likely culprit, but that is a problem you could probably live with. Just adjust your temp setting higher.

Mar 30, 2011 | Sta Rite Pool & Spa

1 Answer

I have a Lochinvar pool heater that on the dispaly is showing Air Pressure Switch Open. I looked at the manual and it talks about air flow from the supply vent and exhaust vent. Than it says about...

Hi and welcome to FixYa, I am Kelly.

Try this before taking anything apart to far:

The pressure switch is located in the front header, behind the

upper side jacket panel, above the water connections. When

required, the pressure switch can be reset with the following


1. Clean filter and skimmer.

2. Start filter pump.

3. Set digital thermostat to highest setting.

4. Turn the adjustment knob on the pressure switch clockwise

until the combustion air fan in the front control panel turns

off. Fan will not turn off if system pressure exceeds 5 PSI.

5. Slowly turn the adjustment knob counter-clockwise until the

combustion air fan turns on. Turn knob an additional ¼ turn


6. Turn filter pump off and on several times. The heater should

shut down immediately when the pump stops.

7. If the heater does not shut down immediately as the filter

pump stops, repeat steps 4, 5 and 6 until proper operation

is achieved.
8. Reset thermostat to desired temperature setting.

If after doing all of the above you still have the problem.... you can remove the switch and check for debris in the water passages. If you find debris remove it, reinstall the switch and repeat steps above.

- Still have the problem... Replace the switch.

Thanks for choosing FixYa,

Mar 21, 2011 | Lochinvar ENERGY RITE 399000 BTU PROPANE...

1 Answer

I have a Pentair Mastertemp 400. It worked fine for 3 years until the temp sensor went out and both (internal and external) were replaced about a year ago. It then worked fine for about another 7-8...

You might have a much bigger issue than the temp sensor. When the heater is running hold the "pool" or the "spa" button for 12 seconds. This will show the exhaust temp, if the temp is rising above 375 degrees with in 1-2 mins then your not getting the heat out of the heat exchanger.
One other thing to check would be an external by-pass. If you have an external by-pass make sure the by-pass is set correctly. Opened or closed to much can cause the problem your having.

Mar 04, 2017 | Pentair MasterTemp 400000 BTU Pool and Spa...

1 Answer

My whirl Pool side by side is not cooling well, I have washed the coils completely and used the recommended thermostat settings, but I have had thawing in the freezer and in the refrigerator,the freezer...

How to check everything

The fridge gets its cold air from the freezer through a vent(damper) between the freezer and fridge.The fan in the freezer blows air through it. There is a flap you adjust with the fridge temp. control. Make sure it's opening and closing when you adjust the fridge temp

If the evaporator coils behind the back panel of the freezer are icing up because of auto defrost failure that will stop the circulation of cold air and eventually affect the freezer too.

check defrost timer, defrost heater, defrost thermostat. In most newer models the timer has been replaced by an electronic control board. If the heater and thermostat are ok it’ll be the control.

You can turn the defrost timer till it clicks and everything shuts down. The heater should now come on. If it does, replace the timer. If it doesn't, check the heater and defrost thermostat. Turn the timer again till everything starts back up to end the defrost cycle.

Sep 06, 2009 | Whirlpool 25.6 cu. ft. Side-by-Side...

1 Answer

The power supply on my hayward h100i pool heater is definitely on, but the unit seems totally dead: no fan, nothing. was working fine as i turned it off yesterday.

Verify the pressure switch and thermostat are both closed while the pump is on. Be sure the front panel is on the heater. Access the parts with the top removed. If they are you will likely need to replace the control board, part number IDXMOD1930. If not, replace whichever part is open.

Aug 28, 2009 | Pool & Spa

2 Answers

Minimax pool heater cuts out at 91 degrees when remotely set for

Turn the temp set knobs on the front of the heater all the way up do both pool & spa temp.
If that doesn't help flip the selector switch on the front of the heater the pool temp. This switch doesn't control what heats up Pool or spa it just selects the heater on and which thermistat to use

May 23, 2009 | Pentair Minimax Ch 400,000 Btu Propane...

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