HVAC

Have HVAC questions? Ask an HVAC Expert for answers

Ask an Expert,
Get an Answer ASAP!

Lets give this a shot. I have a Laars Mini Therm II boiler…

Customer Question
Lets give this a...

Lets give this a shot.

Contractor's Assistant: I'll do all I can to help. How long have you been dealing with this?

I have a Laars Mini Therm II boiler and the pilot won't stay lit. since last night

Contractor's Assistant: Do you plan on doing the work yourself?

Everything tells me it's likely the thermocouple but I can't find clear instructions on how to replace it on this unit.

Contractor's Assistant: Did you double-check the thermostat? And what about the unit's filters?

If I can find instructions, yes.

Contractor's Assistant: Anything else we should know to help you best?

Thermostats work, it's hot water so no filters like on a hot air.

Submitted: 7 months ago.Category: HVAC
Show More
Show Less
Ask Your Own HVAC Question
Answered in 2 minutes by:
11/20/2017
HVAC Technician: Rick, HVAC Supervisor replied 7 months ago
Rick
Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 24,380
Experience: 40+ yrs. experience as a licensed oil & gas technician.
Verified

Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. If my initial response doesn’t answer your question then let me know and we can continue our conversation.

Do you have a pilot that's lit all the time or electronic ignition? does it go out when you're trying to light it or wen you walk away?

Ask Your Own HVAC Question
Customer reply replied 7 months ago
Always on. It's a Laars JVT160NDIS mini-therm 2. Last night it would stay on for a few minutes, today it goes off as soon as i switch the gas valve to "on".
HVAC Technician: Rick, HVAC Supervisor replied 7 months ago

Ok, if the pilot stays lit when you release the knob/button but goes out when you turn the dial to ON then you need to replace the gas valve.

Ask Your Own HVAC Question
Customer reply replied 7 months ago
My bad, it goes out when i release the red button.
It did stay on and run the boiler for 15 minutes this morning but now it shuts off when i release the button. I just tried to relight it to verify...
HVAC Technician: Rick, HVAC Supervisor replied 7 months ago

Ok, then replace the thermocouple assuming you have a strong pilot flame that's enveloping no more than the top 1/3 of the thermocouple

Ask Your Own HVAC Question
Customer reply replied 7 months ago
Pilot is blue and looks good - no yellow. There is crud on the thermocouple so I figured that would be a good place to start but I can't find clear instructions on how to do that on this unit.
HVAC Technician: Rick, HVAC Supervisor replied 7 months ago

Ok, remove the air box (2 screws) that encloses the burners. You might be able to reach in and pull the thermocouple out. If not you have to remove the burner it's attached to. To do that you need disconnect the thermo and pilot tubing at the gas valve then slide the burner forward off the manifold orifice then up and out. When you put the burner back be sure it sits in the slot/notch at the back of the boiler before you slide it back onto the orifice

Ask Your Own HVAC Question
Customer reply replied 7 months ago
OK, I'm following. In fact, I got this far on my own. The challenge is that the burner tubes don't come out. Before I start disconnecting things, I did test the thermocouple while holding the pilot button in and it is reading ~30mv. Is there something else that I should be looking at? 15 bucks for a new one is a no-brainer but I will have to drive into town to get one and want to limit the number of trips if i can...
HVAC Technician: Rick, HVAC Supervisor replied 7 months ago

30 mV from the thermo indicates there' nothing wrong with it. So that indicates a bad gas valve. I'd still replace the thermo when replacing a gas valve. If you can't get the burner tube out then you'll have to remove the entire burner tray.

Ask Your Own HVAC Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a hvac technicianLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Rick Your Own Question
Rick
Rick
Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 24,380
24,380 Satisfied Customers
Experience: 40+ yrs. experience as a licensed oil & gas technician.

Rick is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future.

JimmyBagley, IA

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

Phil

Phil

Mechanical Engineer

7,426 satisfied customers

Retired HVAC/ Electrical & Boiler contractor. Industrial

Rick Mather

Rick Mather

HVAC Technician

3,133 satisfied customers

35 years experience, HVAC

Matthew

Matthew

HVAC Technician

2,014 satisfied customers

14 years experience in the HVAC field of service, installation, Manual J & D calculations

Brian HVAC Guy

Brian HVAC Guy

HVAC Technician

1,019 satisfied customers

I have been an HVAC/R mechanic/technician for 30+ years.

Kenton Guidry

Kenton Guidry

HVAC Technician

963 satisfied customers

12 years install/service experience.

Rick Ridley

Rick Ridley

UK Heating Engineer

871 satisfied customers

Retired But have had 30 years on the tools, Ex CORGI

Tom

Tom

HVAC Technician

770 satisfied customers

16+yrs HVAC/R service. Residential Commerical Industrial

< Previous | Next >

Related HVAC Questions
Need help with a gas operated Steam boiler. I have changed
Need help with a gas operated Steam boiler.I have changed the thermal couple.Cleaned the flu from the basement all the way through to the top of the chimney outside.Can't think of the name of it but t… read more
Rick
Rick
HVAC Supervisor
24,380 satisfied customers
I am a general contractor and have 2 things I need answered.
I am a general contractor and have 2 things I need answered. First, I have a Teledyne Laars 85,000 btu mini therm II boiler that is supplying 5 radiant floor zones. I believe that this boiler was inst… read more
Rick
Rick
HVAC Supervisor
24,380 satisfied customers
Ive got a weil mclain boiler and the burners aren't working,
ive got a weil mclain boiler and the burners aren't working … read more
Rick
Rick
HVAC Supervisor
24,380 satisfied customers
Rick.. I have a Burnham Series 2 Gas Boiler and it's not
Hi Rick.. I have a Burnham Series 2 Gas Boiler and it's not keeping a flame after I hold down reset and light the pilot. The pilot lights but the second I release the reset button, it goes out. Any he… read more
Rick
Rick
HVAC Supervisor
24,380 satisfied customers
American Hot Water Heater BFG6150T403NOV pilot won't stay lit.
American Hot Water Heater BFG6150T403NOV pilot won't stay lit. Replaced thermocouple and checked orifice on burner and it was clear. What else?… read more
HVAC Guru
HVAC Guru
Service Technician
Associate Degree
682 satisfied customers
I have a teledyne laars mini therm heater. 18 psi and 75 degrees.
I have a teledyne laars mini therm heater. 18 psi and 75 degrees. Pilot is lit but heat won't turn on. Some water is dripping… read more
canuck the pro
canuck the pro
262 satisfied customers
Teledyne Laars Energy efficient mini Therm stopped working
I'm in Canada. My heater is not working anymore, I need a new one. Is Teledyne Laars Energy efficient Mini Therm JVT-75; Do you think is a good idea to buy Teledyne Laars Mini Therm II JVT 125. Looks … read more
warmneighbor
warmneighbor
owner
Vocational, Technical or Trade Scho
9 satisfied customers
we had a laars mini therm boiler installed about a year ago,
we had a laars mini therm boiler installed about a year ago, it was working fine, its a standing pilot natural gas boiler, hot water base board heat, yesterday the unit stopped working, pilot went out… read more
HVAC Guru
HVAC Guru
Service Technician
Associate Degree
682 satisfied customers
have a 30 year old lennox which i believe to be the G12RE model
have a 30 year old lennox which i believe to be the G12RE model since it plugs into an outlet. pilot light can't seem to stay lit. at times, very hard to get pilot relit. have changed out the thermoco… read more
theplumber717
theplumber717
Plumber
Vocational, Technical or Trade Scho
791 satisfied customers
No problem with the pilot light. It is lit and stays that
No problem with the pilot light. It is lit and stays that way. Turning the control knob to the "ON" position is OK also. Pilot stays lit. Then when the temperature control is turned up, the main burne… read more
mranswer
mranswer
TECHNICIAN
Bachelor's Degree
481 satisfied customers
I have a Laars Mini-Therm II, Model JV, installed new 10 1/2
I have a Laars Mini-Therm II, Model JV, installed new 10 1/2 years ago when we built our home. Last September we replaced a 14 month-old electronic ignition -- a refit intended to solve the problem of… read more
Rick Mather
Rick Mather
HVAC Technician
Vocational, Technical or Trade Scho
3,133 satisfied customers
We have a Laars Mini-Therm JVi. It stopped heating last night.
We have a Laars Mini-Therm JVi. It stopped heating last night. The fan is running constantly but the ignition switch (JVH) will not light the boiler. I tried contacting our local distributer but they … read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
i have an ackerman boiler and it will not stay lit if i open
i have an ackerman boiler and it will not stay lit if i open the valve in one of the ones it clicks like its going to fire up but it doesn't the boiler was installed back in the early 80s and we bough… read more
Patrick
Patrick
Bachelor's Degree
1,269 satisfied customers
I have a Laars Mini-Therm II Hydronic boiler with 50 gallon
I have a Laars Mini-Therm II Hydronic boiler with 50 gallon Indirect water heater attached. About 2 years old. Recently does not light upon demand for house or water heat. Sometimes does, sometimes do… read more
Rick
Rick
HVAC Supervisor
24,380 satisfied customers
Hi, I have a LAARS Jandy-Hot Shot 100kbtu pool heaterModel
Hi, I have a LAARS Jandy-Hot Shot 100kbtu pool heaterModel LH1--It is natural gas, and the pilot lights and stays lit, however when i turn the unit on and turn up the thermostat, the burner tray fres … read more
Tim H
Tim H
Lead building engineer
Vocational, Technical or Trade Scho
1,922 satisfied customers
I have a Teledyne Laars mini therm II model JVT125N serial
I have a Teledyne Laars mini therm II model JVT125N serial V94E03774. I am thinking it is 15 yrs. old. I think the old home owners must have put this in them-self as is quit jerry rigged. Wires have b… read more
Rick
Rick
HVAC Supervisor
24,380 satisfied customers
We have a Peerless cast iron boiler - natural gas. Tried to
We have a Peerless cast iron boiler - natural gas. Tried to relight pilot but it wouldn't stay on. Repairman replaced thermocouple and adjusted the pilot deflector unit. Pilot stayed on and burner lit… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
my 89 year old mom hasa a 60 year old rheem furnace, the pilot
my 89 year old mom hasa a 60 year old rheem furnace, the pilot has been working great, but now, i can't get it lit. the polot was working great yesterday. the furnace was sometimes starting,stopping w… read more
Mark Henley
Mark Henley
HVAC Controls DDC
3,209 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x