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How to install high limit switch - Jandy LAARS LX250 - NATURAL GAS, DIGITAL READ-OUT, LOW NOX

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They are mounted under side of header where plumbing goes in and out black wires to them

Posted on May 28, 2015

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Posted on Jan 02, 2017

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How to check high limit switch on theme Hester


turn all power off. remove both leads to high limit switch. take a multimeter, set it to OHMS......put leads across high limit switch....if u get a reading then switch is closed. if you get no reading then switch is open

May 04, 2014 | Rheem 266K to 399K BTU Swimming Pool...

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Honeywell S9200 causes transformer death when limit switch attached


If jumping 1 to 7 is blowing the fuse it sounds like a bad board.Not familiar with those but as you said, normally closed limit would be the same as a jumper. Check your dip switches first but I'm thinking bad board/direct short.

May 24, 2017 | Honeywell Heating & Cooling

1 Answer

I have a thin twin stacking whirlpool washer/dryer. The high limit switch is kicking off the element within 2 mins of running. So heating element heats up red hot, then clicks off after 2 mins. I have...


I think you are on the right track with a faulty high limit switch. When i serviced these units we always replaced the operating thermostat and the high limit switch together they came in a kit. The operating thermostat in theory should never let it get hot enough to trip the high limit switch, which is really just a safety backup for the operating thermostat. Get the kit and replace both, and also make sure your exhaust vent going outside has good flow at the outside vent,a restricted vent system will cause similar issues.. Good Luck

Oct 07, 2010 | Whirlpool LTE6234D Top Load Stacked...

2 Answers

My Blower runs 24/7 and the burner is not kicking on.... Is this a high limit switch issue?


It might be the high limit, but it could also be the roll out switch or the flame sensor. Start by ohming out the simple switches the high limit the rollout if the are good use a piece of light grit sand paper or some emery and clean the flame sensor. This is a rod that sits in the flame of the burner telling the gas valve the burners are lite and it is okay to keep the valve open.

Jan 15, 2010 | Ruud UBHC Air Conditioner

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NO HEAT


Either heater is burned up, or high limit is bad. If you take dryer apart and get to heater you will be able to visibly see the broken heater wire. To check high limit switch disconnect the only two wires on the switch and using Ohm meter put one lead on each terminal. Should read closed if switch is good. High limit switch is located on panel covering heater coils If heater is not broken, and high limit switch is closed then you are losing power on your temperature control.

Jan 10, 2010 | Whirlpool LER4634J Electric Dryer

1 Answer

I have a dyno glo rmc-fa100dlx forced air heater. It will light and work for a few minutes, up to about 5, then it will stop heating and the fan will keep blowing. any ideas? thanks!


If the unit comes on and runs but then shuts down, that sounds like an indication of a high limit trip.

Most, if not all, furnaces have high limit switches that keep a constant check on the temp inside the furnace or air handler. On most systems, once this high limit switch has been made (got to hot), the limit switch breaks control voltage to the heating device (strips, gas, fuel, etc.etc..). The blower motor continues to run until the high limit has dropped in temp and reset itself.

On some models, the high limit is a manual reset, meaning you need to reset the switch yourself or shut the unit off and then back on to reset it.


Check all filters and replace as necessary. Check the coils and fan blades for dirt build-up and cleanliness. Check motor belt (if applicable). If all these fail to solve the problem, then your issue either lies within the blower motor itself not moving enough air for proper heat transfer. Or the high limit switch itself is failing.

Jan 09, 2010 | Heating & Cooling

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Jandy LX250 LT Pool Heater High Limit Switch


Jump the High limit switch. If it fires the switch is bad

Jul 16, 2009 | Jandy LAARS LX250 - NATURAL GAS, DIGITAL...

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