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

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The heater will ignite and then a few swcons later shut down. It will do this continuously.

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Depending on the safetys provided on this unit it looks like the Flame Sensor is bad.. The unit will light in normal mode and once the unit is expected to be running full flame it goes through a verification of flame process.. Either by use of a thermocouple or "fireeye" type product. If its an eye it will have one wire going to it and then another going back to the board or controller. SOmetimes these will have a small reset switch on them.. let me know what you find so I can help further

Posted on Sep 05, 2010

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How to make sure you Heat is working


A common problem with a furnance is the furnance will attempt to ignite, several times, you will notice that the house is not heating properly. You will hear the furnance come on and you will assume the heat is on, and the house will continue to be cool. You wiil check the furnance and you will hear it start up and the blower will come on, however a few seconds later after you have walked away the blower will shut down and there is no heat on at this time. You will again go check the furnance and after the furnance start and go through the cycle the furnance will shut down you will notice that the furnance has indeed shut down. This is the common problem of the flame sensor, you will have to remove the flame sensor, get a small piece of fine grade sand paper, and remove all the black colored carbon from the flame sensor until is is shinning bright, replace the flame sensor and attempt to start the furnance. You will notice that apatment or house have reach the set temperture, that the furnance has went through its cycle and the furnance will ignite and stay on continueously until the house obtain the preset temperture..

on Dec 13, 2009 | Heating & Cooling

1 Answer

Light flashes 4 times


ignition failure. insure air pressure switch closes, hot surface igniter is getting 120volts. check continuity on hot surface igniter, make sure all gas shut off valves are open and gas valve is turned on. make sure there is no blockage in the exhaust

Apr 18, 2014 | Goodman GMS90703BXA Heater

1 Answer

Goodman 075-3 fan runs but no voltage going to igniter


One thing you can checkmis the continuity through the ignitor itself if you have continutity through that there is also some safeties it has to go through but the board is where the voltage is supplied for the ignitor. I would check the high limit and the roll out before condeming the board.

Dec 20, 2009 | Goodman GDS80904BNA Open Flame Heater

1 Answer

My reddy heater R50,(50,000btu)when started will


the unit is working exactly as designed , the system is noticing that the unit has not fired so it shuts down so there is not a lot of unburnt fuel everywhere.
try to find out why the unit is not igniting . is the igniter sparking continually

Nov 12, 2009 | Tools & Hardware - Others

1 Answer

Furnace keeps shutting down after lights


time to call service guy you are cycling on a saftey which means somethings not right in ignition circuit the only thing i would tell a untrained person to try is cleaning the flame rod which is part of the pilot assembly it is a metal rod that gives small electric current to ignition device confirming that you have a pilot lite you can lightly sand with sand cloth

Apr 13, 2009 | Goodman GMS90703BXA Heater

1 Answer

Duct fan comes in, igniter lights, but no flame


Remove the front panel. Tape the door switch to the closed position. If the thermostat is calling for heat the furnace should do the following: a light on the circuit board will flash and then the exhaust blower will start. A few seconds later (10-15) you should hear clicking at at the circuit board and an orange glow should be seen thru the small viewing port. A few seconds later the gas valve should open and the orange light will turn blue. If the blue flame only lasts a few seconds and then goes out, their may either be a blockage not allowing the flame to travel to all the burners and not allowing a flame sensor to sence flame, shutting down the unit. After a few cycles of not starting, the circuit board will flash a series of codes that you can read if you look on the back of the front cover. It will give you a starting point where we can research and come up witha more difinitive answer. Let us know what you find for codes.

Oct 26, 2007 | Goodman GMS90703BXA Heater

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