Question about Teledyne Laars Laars LT Heater 400000 BTU NG Elec Ignition

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Heater won't fire up after sitting the winter

Worked fine last season! Pressure switch?

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Problem with the thermocoupler its not producing a minivolt of 250 plus that is needed to open the main gas valve


Posted on Jun 05, 2010


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017


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2 Answers

Aqua pro 500 is flashing lp. We just had a new pump installed and are just trying to get pool warmed up. Pump worked fine last season. Any suggestions?thank you

LP: This code means "Low Pressure" or low pressure switch. Either the outside ambient temperature is below 50°F (38°F
for h/c units), which is too low for the heater to operate, or the unit is low on refrigerant. Once the outside temperature has risen above 60?F, and the LP code remains, call the factory for repair.

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Pilot lights and stays lit...however heater will not fire up

this might be a cool fix. pressure switch tells the main heater it's ok to fire up as the water flow os sufficient


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check gas pressure too low it overheated replace fusible link on bottom after gas is fixed then clean heat exchange of soot

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We get a horrible smell occasionally with our Rinnai Avenger 25 nat.gas heater when alight. The filters are clean & was serivced last winter. It was making the smell at times even after the service. It...

From what you have described, it sounds like a case of delayed ignition or as the Owner's Manual calls it a "Combustion Control Fault"or "Incomplete Combustion". This can be caused by several things: A change in the gas pressure; dirty or clogged burner, electronic fault in the combustion controls.

Despite having it cleaned an services last Winter, 12 months have elapsed, with the unit just sitting and collecting dust and spiders. Portable Heating units should be serviced annually. Usually in the early Fall, before firing it up for the heating season.

Hope this helped you ... Cheers.

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1 Answer

Ben sitting in the garage all winter it has a new battery i checked all the fuses an the connections all it does is turn over but no fire

This new gas that everybody is selling with the ethanol goes bad very quickly try using some lucas fuel stabilizer and if that does work check the run / not run switch above the start button if it got some corrosion in the switch it would allow the engine to turn over but not fire. Good luck riding season is right around the corner.

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Have a Triton Millivolt pool heater pilot is lit and nothing!!

Low out put voltage from the pilot generator and/or an open circuit in the control circuit...the most common is a bad pressure switch (dirty filters can hamper pressure switch operation).


1 Answer

Pool heater wont fire up

check pressure switch for continuity with pump on

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