Question about Lite On Laars Lite 2 Heaters: 250,000BTU MV Heater

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LARS 2 LITE HOT SURFACE IGNITOR IS NOT IGNITING

Electricity is flowing fine to the unit, gas is flowing fine, but the "hot surface ignitor" is not igniting.  This is a frequent problem I've had over the years, and seems to get worse as time goes by.  I've had it "repaired" a couple of times but technicians never would show me what they did.  It seems like a system that is prone to frequent failing.  Is there something I can do to fix it and then to maintain it so this no longer occurs, or is this new-fangled "hot surface ignitor" technology so sophisticated and complex that I'd be better off hiring a technician and/or replacing the faulty part?  Thanks - Tom in L.A.

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  • tjbworkstati Feb 06, 2009

    Thanks, Guru - I'll give that a shot and let you know how it all goes.



  • madirap Mar 25, 2009

    I had the same problem. Got the HSI checked from the store everything was okay. The unit starts fine but no heat. The HSI does not heat.

    What could be the problem

  • nyjet Apr 01, 2009

    How do you perform a HSI test?

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How do you perform the hsi test on a 2005 ld400n

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I think you could be buying you own HSI part and replace yourself. But I would suspect that the technicians are not being careful when the install the new ones, or someone is getting their hands on them.
But even at that, they are problematic. I am not sure if there are different grades of HSI's either, so that may be the problem too.
They are not that hard to replace. You just need to be sure that it is the as being the cause of the failure.

I would order new ones on the Net, and replace. Just be sure not to touch the HSI, PERIOD. Use only the wrapping that the HSI comes in to hold it, and only remove when all possibility of touching it has gone.

Let me know if you have any more questions. I'll be happy to reply. I somehwat got out of the business as HSI's were coming in, but I do know the right questions to ask, and how to figure out what's happening.

Posted on Jan 29, 2009

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