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Pressure Switch Laars Lt 400 Pool Heater


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The pressure switch is the round device that has a hose (the diameter size of a pencil) connected to it. If you are 100% certain there is water flowing through the heater then you can jumper out the pressure switch. If the heater still doesn't fire, you've got other issues.

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it is also possible that you have some corrosion in the tube. Disconnect the switch from that tube, then turn the filter pump on as see if you get a good stream of water out the tube.

That reminds me that I've seen corrosion on the orfice to the switch.....because that hole is small and the pool water either reacted with the switch metal case or the pool water just left deposits around the hole.

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