Question about Lite On Laars Lite 2 Heaters: 250,000BTU MV Heater
Verify that you have the correct switch. When it senses proper pressure, you should read zero (or nearly so) resistance through the switch. Disconnect 1 wire (either one), and use a multimeter to check the resistance If the pump is working like it should, bypass has not been monkeyed with, then the switch should indicate very little resistance.
If the switch has not closed, when it normally should and you are positive that you have adequate pressure, you can try adjusting the pressure switch until it closes like it needs to.
You should be using a switch that is normally open, and closes to complete the circuit when pressure requirements are met. I suspect that you might have a valve that is normally closed, and opens when pressure is present.
The easiest, and fastest way, to see if the switch is wrong, turn off the pump, and try to light the heater. If it does light (with zero water pressure, quickly turn it off, and start looking for the correct switch. If the heater still doesn't light when pump is off, turn the pump back on, and adjust the switch until it comes on (per manual, of course).
Posted on Aug 19, 2010
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Posted on Jan 02, 2017
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