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I HAVE A LAARS ENDURANCE BOILER/WATER HEATER THE HEAT IS ALWAYS ON. I EVEN TOOK THE LUXPRO THERM OFF THE WALL AND IT KEEPS RUNNING , I HAVE TO SHUT THE BOILER OFF .

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Posted on Jan 02, 2017

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SOURCE: Ihave aTeledyne Laars mini therm jvt

You ether have an internal by-pass or an external one. If you have an external one you need to close it up to 80-90 persent. This will allow some water to go past the heater but most will go through it. If it is open too much the water will offer enough pressure to start the heater but if it doesn't flow through it. It will boil the water inside it and gurgeling and pounding as the water expands. If you have a problem with your internal by-pass you will get the same result but it is harder to fix. This is a disc mounted on a shaft held closed by a spring inside your water manifold on the heater. If you open the header you can get access to the by-pass and may be able to sand the shaft down or if the disc is broken you can replace it. Hope this helps and good luck.

Posted on Dec 20, 2009

  • 1 Answer

SOURCE: have a problem with a laars mini therm ii boiler. the pilot keeps

hi. i have mini temp boiler 150 btu 5yers old . it is burning with know radiation .it is up to thempitio .but it will not shut off.flame is good radietor is hot ,help?

Posted on Jan 05, 2010

  • 82 Answers

SOURCE: have a problem with a laars boiler the pilot keeps

How long does it stay lit (if at all)? It sounds like the thermocoupler (about 10 bucks). Good luck

Posted on Jan 05, 2010

  • 1 Answer

SOURCE: Laars Endurance ebp have hot water but not heat

check the valve actuator honeywell zone valv

Posted on Dec 02, 2010

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Ihave aTeledyne Laars mini therm jvt boiler(Canadian).When the burner fires up you can hear the water gurgling in the boiler and or volute heat tubes,is this normal? or what is the problem,Low water?and...


You ether have an internal by-pass or an external one. If you have an external one you need to close it up to 80-90 persent. This will allow some water to go past the heater but most will go through it. If it is open too much the water will offer enough pressure to start the heater but if it doesn't flow through it. It will boil the water inside it and gurgeling and pounding as the water expands. If you have a problem with your internal by-pass you will get the same result but it is harder to fix. This is a disc mounted on a shaft held closed by a spring inside your water manifold on the heater. If you open the header you can get access to the by-pass and may be able to sand the shaft down or if the disc is broken you can replace it. Hope this helps and good luck.

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Have a problem with a laars mini therm ii boiler. the pilot keeps


hi. i have mini temp boiler 150 btu 5yers old . it is burning with know radiation .it is up to thempitio .but it will not shut off.flame is good radietor is hot ,help?

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