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

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Pool burners will not come on thermacouplar is working.

Is it in the hot cold control or is it in the thermastat, does this work like a hot water heater?

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Jump out the thermostat to test the unit. If it comes on, you have your answer. If it does not come on, you will need to look at the control.

Posted on Dec 05, 2008

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1992 subaru legacy 2.2 liter overheating and no heat. already replaced waterpump,thermastat, radiator and hoses


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If so
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-Check the heater control valve and flush the heater unit with water of garden hose from both directions.
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Thermostat holds water in motor until it heats up to thermostats temp. While thermostat is closed (holding water back) it allows water in radiator to cool. When thermostat opens cool water enters engine through lower hose, hot water into radiator. When cool water hits thermostat it closes again and repeats the cycle. Your A/C is not dependant on heated water as when air is on, heater valve in heater hose is closed. Get yourself a new housing, gasket & thermostat and fix it right. An added bonus is you'll probably get better gas mileage with correct thermostat.

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Water heater heats water, but not long enough or sometimes not hot enough. The hot water runs out too fast, does not provide hot water continually


The first thing I would do is turn up temp control on gas valve.Control is located on front of gas valve at the bottom front of heater.They usually have a indicator dial on front with an arrow pointing direction.Turn dial to higher setting when burner is not on and this should turn burner on and provide hotter water. The control is normally turned clockwise to increase temperature.If control is already turned all the way up then water heater may need to be replaced.Depending on water quality in your area heater may have a large amount of mineral build up and it may not be capable of producing enough or hot enough water. If this the case all I can suggest is to try to drain tank and flush some of the deposits out. If you have installation manual it will give you instructions on how to do this. If not see if you have working shut off valve on cold water line ,if it works shut it off and connect drain hose to drain valve on bottom right side of gas valve. Put hose to floor drain or sump basin if you have one. Turn control knob on top of gas valve from on to pilot,this will leave pilot light on but prevent burner from working while draining. Open drain valve ,flow rate may be slow or not at all. Open hot water side of some faucet to provide air to help draining. You may try opening water supply valve to heater a few times to aid in draining. If you can get it to drain,shut drain valve off when done,turn cold water supply back on and shut off hot water outlet. Then when tank is full open hot water vavle to bleed air out of heater and piping. Turn control knob on top of gas valve back to on position. This should bring burner back on .It will take about 1/2 hour to heat. If you can't get it to drain or this doesn't help you might consider getting a new 40 gallon heater. Hope this helps. Thanks

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1 Answer

Heats up the rapidly decreases within in minutes.


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