Question about Teledyne Laars Laars Lite2 Heater 175000 BTU NG Elec Ign

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Heater burner will not light even though pilot is lit.

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  • kejones05 Aug 06, 2010

    The capacity stated is incorrect. My heater is rated at 399000btu/hr.

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If the pilot is on, then it is getting gas. Like the control unit is not kicking on.
Sequencer or heating relay acts like a 24 volt x 120 volt contactor to make the 24 volt thermostat current to allow 120 line voltage to the inducer, for the very first function of the furnace. Without that inducer running, the 24 volt safety circuit cannot function to allow current to get to a control board or module.
Other components include: ignitor, flame sensor, bad pressure switch, dirty burners, bad gas valve, or bad filter can also cause this.
If you have a combination NO, NC 3-wire pressure switch that requires the pressure switch to close current when the inducer is NOT running yet (to thwart people who put jumper wires on one), that pressure switch may be sticky or bad contact inside it, and not closing down(or making good contact) after the furnace shuts off sometimes!! You could jumper the NC terminal and see if at least the inducer runs. Or even **** or blow on the pressure switch tube, into the pressure switch, to see if the pressure switch is sticky. You'd know if by doing so, the inducer were to start up. And by doing repeat tests with and without it, to rule out coincidence, then you'd know if the pressure switch was faulty or not.

Posted on Aug 06, 2010

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it also sounds as though the pilot injector could be blocked so when the boiler comes on it extinguishes the pilot & then when the burner goes off boiler shuts down, or also the pilot rate maynot be set right, so when the main burner kicks in it robs the pilot of the gas it requires.
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