HVAC

Have HVAC questions? Ask an HVAC Expert for answers

Ask an Expert,
Get an Answer ASAP!

This answer was rated:

I have a newly installed gwb8 boiler. Temp. Doesn't seem to…

I have a newly...

I have a newly installed gwb8 boiler. Temp. Doesn't seem to reduce sufficiently when I lower thermostat.

Contractor's Assistant: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat?

Happened with original thermostat which worked fine before install of new boiler so installed new nest E thermostat and is still happening.i don't think it's the thermostat. Unit does not appear to be on when thermostat has been lowered but temp stays to high

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

Probably not, but wanted to understand possible issues before bringing back the people who installed the boiler

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

If I set thermostat at higher target heat than room temp., the boiler does come on and hearts until room temp increases to target heat, which makes me think that thermostat is working.is it possible unit is heating water too high?

Show More
Show Less
Ask Your Own HVAC Question
Answered in 43 minutes by:
3/19/2018
Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 9,317
Experience: Retired HVAC/ Electrical & Boiler contractor. Industrial
Verified

Hello, turn the thermostat down 5 degrees cooler than the room temperature, then go to the boiler and tell me if the boilers hot water circulating pump is running and if it is firing or not.

.

Next tell me if you have free standing radiators or in-floor radiant heat... we can go from there without any time limits.

.

My goal is to give you the best experience possible! I hope I have earned a 5 star rating! Please remember to rate my service by selecting the 5 stars at the top of the screen before you leave today.

If you need more assistance, please use the reply box and let me know.

Ask Your Own HVAC Question
Customer reply replied 1 month ago
Circulating pump does not appear to be running when the target temp is lower (5 degrees or more) than the room temp. I have hot water baseboard heat.
Customer reply replied 1 month ago
Would prefer not to spend more $ on this service, so no call at this time. Please just e-chat.

No more money is required, any phone call offers you get come from the companys automated system, not from me

Ask Your Own HVAC Question
Customer reply replied 1 month ago
If no further charge, then call is fine. Cell # is(###) ###-####

If the hot water pump goes off when the thermostat is set lower, we know that the temperature controls work.... verify that the boiler also ceases firing... it should.

If that is the case, then your system is working properly and apparently its not too cold outside... so that the house cools down slowly.

Phone calls are additional... but you do not need to accept any phone call offers. We can continue here in this dialog box without any time limits

Ask Your Own HVAC Question
Customer reply replied 1 month ago
I’m outside of Albany, NY. Temperature outside is about 29 degrees F. Last night was down to 10 degrees and took quite a while for it to cool and never reached target temperature. It is either barely cooling at all or very minimally. I’m not sure, but there does appear to be a bit of residual heat coming from the baseboards even when the circulator isn’t running. Is it possible the water temp from the boiler needs to be lowered?? It was about 150 degrees when I checked a couple of hours ago.

150F is a good temperature range for most boilers, you can try setting it lower but not lower than 130F.

.

It is also possible that there is water circulation with pump not running, this happens when a new system is installed without the proper 'check valves'... tell me about how old the system is,

.

We can go from there.

Ask Your Own HVAC Question
Customer reply replied 1 month ago
System was installed this past week (Wednesday) and issue has been going on since the new installation.
Customer reply replied 1 month ago
Service manager came on Friday and indicated the possibility that the original thermostat wasn’t working properly, but I’ve now swapped out the thermostat for a new Nest E. Old thermostat had worked fine up until the old boiler was replaced.
Customer reply replied 1 month ago
House is 1950’s vintage construction with new energy efficient windows, but insulation of 1950’s vintage, so it’s definitely not a super well sealed house. In the past, once the boiler went off (when thermostat was lowered), temp would begin to fall pretty quickly after lowering the thermostat.
Customer reply replied 1 month ago
Tonite I lowered the thermostat from 68 to 55 around 9:30. Room temp was 68-69. It’s now 11:20 here and room temperature on the thermostat shows as 67. It’s barely gone down in almost 2 hours with temps outside at about freezing or slightly below.

Thanks, ***** ***** about 99% likely that check valves were not installed with the new boiler to prevent hot water flow when the hot water pump is off.... any contractor that made such an error would not be experienced enough to know that can happen or would be a problem.... so they will come up with non workable solutions.

You can tell if that is happening or not by turning power off to the pump, then feeling the piping in and out of the base boards, if the water is hot. ... then there needs to be check valves installed in the piping. That is called gravity induced flow, cooler water is heavier than hotter water, so that the cool water flows down and forces water into the boiler.... that water forces hot water out of the boiler and back to the baseboards.

.

there is another issue, a competent boiler installation will have a 'flow switch'...that is wired to keep the boiler off unless there is substantial hot water flow, gravity flow of hot water should not be sufficient to provide that flow.

I see those two errors in the installation so far.

Ask Your Own HVAC Question
Customer reply replied 1 month ago
When you say to check the pipes in and out of the baseboards, you mean to check the pipes coming from the floor into the baseboards? How long after turning off the heater should the pipes be cold?
Customer reply replied 1 month ago
Where do the check valves get installed—at the boiler or at each baseboard??

Yes, pipe coming through the floor to the baseboards... that pipe should start cooling off within 10 minutes and be at room temperature within 20 minutes if there is no gravity induced hot water flow.

.

a careful study of the piping needs to be done in order to prescribe location of the check valves, and dont forget you also need a 'flow switch'

https://inspectapedia.com/heat/Check_Valves_Heat.php

click that link, see the piping diagram and explanation.

,

Its time to rate my input for the day, that gets me paid, locate the "finish and rate your expert" link near the top of the page and click on it. I will appreciate that very much.

I am in every day from 9 am to 11 pm west coast USA time to do any follow up needed.

Ask Your Own HVAC Question
Customer reply replied 1 month ago
I’ve shut down the boiler about 5 minutes ago as I was waiting for your response. System seemed to work fine until last boiler failed after many years of reliable service. Would it have had check valves already installed, or are they something that gets installed as part of a new boiler installation?

Any slight change in the piping with the new boiler could be enough to enable this gravity flow... so that your old boiler may not have needed them but the new boiler would.

Did the hot water line going to the baseboards cool off when pump was shut down? Keep checking,

and check both pipes at each base board to make sure you have the right one.

click here for a bunch more diagrams

Ask Your Own HVAC Question
Customer reply replied 1 month ago
Will rate you after one last question. Would a flow valve be installed internally in the GWB8 unit. It’s a brand new unit. Or would it need to be external and visible in the pipe configuration around the boiler set up?

The flow switch is generally installed in the boiler water return line,

click here for the boiler manual

No flow switch is shown in the boiler itself, nor is it shown in the piping.. Lennox is assuming that if the pump is running there will be hot water water flow... most manufacturer will not take that chance and will install a flow switch wired to kill power to the gas valve if the flow fails due pump failure or vapor lock in the piping.

.

Ask Your Own HVAC Question
Customer reply replied 1 month ago
I was asking about the flow valve, rather than the flow switch. Would the flow valve always be external to the boiler and visible, or is it sometimes within the boulder itself and not visible without opening the boiler? Is there anything I can say based on what I’ve described to you to show the service person that this is unlikely an issue related to the thermostat?

Yes ... what you are calling the 'flow valve' is actually a back flow preventer, or a 'check valve' it is not shown as part of the boiler, in my 58 years as boiler contractor I have never seen a check valve fit as an integral part of a boiler... these are always fit external to the boiler by the installation contractor as shown in the diagrams I posted earlier.

Ask Your Own HVAC Question
Customer reply replied 1 month ago
Thanks. I will enter a rating. If I have a follow up question tomorrow, is that a separate charge?

There is no charge for follow up questions on the same issue after you rate my work. Thanks for your consideration, use the 'finish and rate your expert' link near the top of your page for that... just click on it, and follow the prompts

Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 9,317
Experience: Retired HVAC/ Electrical & Boiler contractor. Industrial
Verified
Phil and 87 other HVAC Specialists are ready to help you
Ask your own question now
Was this answer helpful?
Ask Phil Your Own Question
Phil
Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 9,317
9,317 Satisfied Customers
Experience: Retired HVAC/ Electrical & Boiler contractor. Industrial

Phil 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

9,317 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

Kenton Guidry

Kenton Guidry

HVAC Technician

963 satisfied customers

12 years install/service experience.

Brian HVAC Guy

Brian HVAC Guy

HVAC Technician

953 satisfied customers

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

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
I need a pilot assembly for my boiler and the number of the
I need a pilot assembly for my boiler and the number of the part is 511-330-116 … read more
Phil
Phil
Mechanical Engineer
9,317 satisfied customers
Munchkin boiler not firing. Goes through blower cycle and
Munchkin boiler not firing. Goes through blower cycle and stope with water temp on doisplay. No error codes reported. Unplugged all sensors one at a time and made sure proper error code reported. Al f… read more
Bill
Bill
Service Mgr
83 satisfied customers
Regarding steam boilers wiring to pressure controls and
Regarding steam boilers wiring to pressure controls and switches … read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
I have an old burnham boiler. series 407B. can't find any
i have an old burnham boiler. series 407B. can't find any manual or parts list. … read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
Having a problem with my Weil Mclain boiler. It's hot but no
having a problem with my Weil Mclain boiler. It's hot but no heat to radiators … read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
Buderus GB142 wall hung boiler with in concrete floor
Buderus GB142 wall hung boiler with in concrete floor radiant heat. Boiler Temp is set at 135, the attached AM10 has the target temp point set at 135 as well and the base temp point at 110. On cold da… read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
My boiler has leak at the top... is that possible to fix
Hi.. my boiler has leak at the top... is that possible to fix this or better cal to the local HVAC specialist..?… read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
I have a cg5 boiler for my home. The boiler ignites and runs
I have a cg5 boiler for my home. The boiler ignites and runs for 10 seconds or so, turns off for 1 or 2 seconds and then reignites, that happens over and over again for 30 minutes or so and then shuts… read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
Crown boiler model # AWI128SNSTPSU NATURAL GAS. Boiler shut
Boiler shut down last night , how do I relight it ? … read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
EcoTecplus 428 boiler,after reset boiler not coming on,but
ecoTecplus 428 boiler,after reset boiler not coming on,but pcb has power. … read more
Plumbers_Mate
Plumbers_Mate
General Manager
Vocational, Technical or Trade Scho
2 satisfied customers
I have a weil mclain boiler and the hot water is not that
i have a weil mclain boiler and the hot water is not that hot and runs out. i was told i need a new coil. … read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
Can you refer me to a Weill McLain boiler repairman? Boiler
Can you refer me to a Weill McLain boiler repairman? … read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
Im getting an error code #65 on my pennco boiler. Boiler.
im getting an error code #65 on my pennco boiler JA: What device or product does this involve? Customer: boiler JA: What's the brand and model of your product? Customer: pennco JA: What have you tried… read more
David Bowden
David Bowden
Owner
764 satisfied customers
My crown boiler boiler model no. AWR070ENST2PSU runs for a
My crown boiler boiler model no. AWR070ENST2PSU runs for a short time, shuts down, then takes a long time on start running again. We change the control. the pump, and the gas valve, Don't appears to h… read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
Rental hot water tank - serviced and insulated pipes Oct
rental hot water tank - serviced and insulated pipes Oct 2017 by Reliance tech-ice build up at elbows on insulated outside plastic pipe - when fan comes on -can hear running water outside from inside … read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
Im working on a boiler right now and the boiler is running
Hi pearl im working on a boiler right now and the boiler is running but is not heating the downstairs not the upstairs. I can't figure out why. Yesterday I replaced the pressure relief valve and the e… read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
Question about basement insulation... It's not a problem -
It's not a problem - it's a question...we live in the Atlanta area. 3 years ago, we purchased an existing home that has a full, unfinished walk-out basement, which means that the entire north and west side of the basement is above grade. The south and east walls are poured concrete and are below grade. When we bought the home, it had zero insulation in the stud walls on the north and west sides. The concrete walls also were not insulated. However, there was faced fiberglass insulation stuffed between the floor joists in the basement ceiliing … read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
The yellow wire on the blower motor through insulation. It
The yellow wire on the blower motor burnt through insulation. It appears to be 15 years old. Would it be safe to repair the yellow wire and continue to run the motor? The ground wite is hanging loose … read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 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