HVAC

Have HVAC questions? Ask an HVAC Expert for answers

Ask an Expert,
Get an Answer ASAP!

We have a Ruud HRV 100 air exchanger. When the outside

Customer Question
temperature gets in the teens...
We have a Ruud HRV 100 air exchanger. When the outside temperature gets in the teens or lower the defrost light flashes.
Water seems to be building up in the large core filter.
We have not noticed water discharging from the plastic line that runs from the exchanger to the drain.
Do you have any suggestions as to what we can do to get it working properly?
Submitted: 2 years ago.Category: HVAC
Show More
Show Less
Ask Your Own HVAC Question
Answered in 10 hours by:
2/11/2016
HVAC Technician: Phil, Mechanical Engineer replied 2 years ago
Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 9,798
Experience: Retired HVAC/ Electrical & Boiler contractor. Industrial
Verified

Hello, in weather below freezing, the incoming cold air freezes the moisture in the warm exhaust air... in order that ice does not build up there is a defrost cycle built into the unit, so that when frost is detected the unit goes into defrost mode. If the unit resumes working again after the defrost then that part of unit is operating normally.

Some water would be on the large core filter but should not be building up.

Can you use the paper clip icon at the top right of the tool bar to send me a few pictures of that, and the drain pan area taken from far enough away that I can see it in context?

We can go from there without a time limit.

Ask Your Own HVAC Question
Customer reply replied 2 years ago
I am at work now. Will touch base this evening. Thanks.
HVAC Technician: Phil, Mechanical Engineer replied 2 years ago

Thanks, ***** ***** work, I am in until 9 pm west coast time

Ask Your Own HVAC Question
Customer reply replied 2 years ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Customer reply replied 2 years ago
I think I bumped the phone call by mistake. I sent a picture from our user manual that shows the light that flashes, that reflects that the defrosting cycle is malfunctioning.
HVAC Technician: Phil, Mechanical Engineer replied 2 years ago

Thanks, ***** ***** the filters last changed, dirty filters will cause both the error codes and the icing. I see Nov 2013 on them... have they been kept clean since possibly.

Let me know about that.

Beyond this issue I need to see a bunch of flash photos of the insides of the filter/ heat exchange box with the filters removed, next time it produces these error codes.... I am putting no time limit on this for you, our software may show the question has timed out etc, ignore that and post when it fails again and with some very clear pictures of the insides of the filter heat exchange box.

We can go from there.

Ask Your Own HVAC Question
Customer reply replied 2 years ago
Sounds good. The nov 2013 is the purchase date of those filters. When the filters are clogged there is a different light that flashes on the control panel. We clean them at that time.
I will get those pictures of the inside of the box in awhile. I'm outside at the moment. Have a good evening.
Tom
HVAC Technician: Phil, Mechanical Engineer replied 2 years ago

Thanks,

http://screencast.com/t/QjYgvknB3mbv

we can go from there without a time limit until we get the system diagnosed.

Ask Your Own HVAC Question
Customer reply replied 2 years ago
Thanks Phil,
It will be a day or two before I can get back to you.
Have a good weekend.
Tom
HVAC Technician: Phil, Mechanical Engineer replied 2 years ago

That will work, just post your response even if the notice says 'timed out etc' I will be here and pick it up.

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 Phil Your Own Question
Phil
Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 9,798
9,798 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

9,798 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

1,024 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
I noticed that the fan was running continuously and only
I noticed that the fan was running continuously and only providing cold air. LED flashed code 33. Checked and replaced filter. It still looked fine. No help. We've been out of the house for about 36 h… read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
HRV is not putting air through the vents properly. But most
HRV is not putting air through the vents properly. But most come out of --I'm assuming-- an overflow duct … read more
Phil
Phil
Mechanical Engineer
Degree, Mech Engr Technology
9,798 satisfied customers
Just came to this page to read link. Did not think I had hit
Hi Just came to this page to read link. Did not think I had hit anything for live chat. … read more
Phil
Phil
Mechanical Engineer
Degree, Mech Engr Technology
9,798 satisfied customers
I have a Freedom 90 furnance and it cycles out and blows cold
I have a Freedom 90 furnance and it cycles out and blows cold air. This is the second winter we have lived in the house. If I push in the reset button the furnance will start back up and run anywhere … read more
HVAC Guru
HVAC Guru
Service Technician
Associate Degree
682 satisfied customers
How do I layout an Air to Air Heat Exchanger? I am designing
How do I layout an Air to Air Heat Exchanger? I am designing a net zero, super-insulated, high performance residence that is heated with electric radiant Ceiling panels. There is no intent for Air Con… read more
Phil
Phil
Mechanical Engineer
Degree, Mech Engr Technology
9,798 satisfied customers
I just bought a house with a heat recovery ventilator - HRV
I just bought a house with a heat recovery ventilator - HRV - never owned one before. I read the manual online, and even had the HVAC installer come and try to explain it, but I'm still confused. I'm … read more
Regan Land
Regan Land
General Manager
Vocational, Technical or Trade Scho
508 satisfied customers
Good Morning I am cleaning my healthy Climate HRV(200)
Good Morning: I am cleaning my healthy Climate HRV(200) by Lennox. The instructions say to wash the core twice a year. Does this mean simply to wipe it down, or should I flush soapy water though it or… read more
M Oglesby
M Oglesby
Vocational, Technical or Trade Scho
2,010 satisfied customers
My home has to AC units - one in the artic for the upperlever,
My home has to AC units - one in the artic for the upperlever, the other in the crawl space for the lower level. Over the last 3 weeks, I've been noticing a damp smell coming form the vents on the low… read more
Phil
Phil
Mechanical Engineer
Degree, Mech Engr Technology
9,798 satisfied customers
My Ruud 2.5 ton Heat Pump Model UPKA-031JAZ (Serial# 6389M309912572)
My Ruud 2.5 ton Heat Pump Model: UPKA-031JAZ (Serial# 6389M309912572) has an Auto Defrost Problem. Last winter the outside coils were freezing up. The temporary solution was to periodically switch fro… read more
gotoman for ac
gotoman for ac
HVAC Service manager and owner
Associate Degree
4,135 satisfied customers
We have a brand new home with real oak floors. The floors
We have a brand new home with real oak floors. The floors are showing signs of excess humidity which is very distressing in a new home. We have a Lennox air exchanger but no one seems to be able to te… read more
Regan Land
Regan Land
General Manager
Vocational, Technical or Trade Scho
508 satisfied customers
HAVE A TRANE SYSTEM (7.50 TON) MODEL NO. TTA090A300CB THAN
HAVE A TRANE SYSTEM (7.50 TON) MODEL NO. TTA090A300CB THAN CONTINUES TO RUN BUT DOES NOT COOL. HAVE CHECKED LOW (70 PSI) AND HIGH (350) WHICH APPEARS TO BE OK BASED UPON OUTSIDE TEMPERATURE AT 95% PLU… read more
Mr. Jeff Pearson
Mr. Jeff Pearson
Refrigeration Systems
Associate Degree
145 satisfied customers
I have a Ream 90, the furnace cuts out with Code 2, Pressure
I have a Ream 90, the furnace cuts out with Code 2, Pressure Switch. I checked voltages OK, I have noticed that condensation builds up, checked and installed new condensate trap, all lines and drain p… read more
Richard
Richard
District Technical Manager
Vocational, Technical or Trade Scho
1,416 satisfied customers
I have a Tempstar furnace which is leaking a small amount of
I have a Tempstar furnace which is leaking a small amount of water from the rear onto my basement floor. I live in Illnois and it is cold outside, thus we are heating and not air conditioning. What mi… read more
Mike
Mike
Service Tech/ Installer
High School or GED
149 satisfied customers
We live in Nova Scotia, Canada and it is currently -8C. The
We live in Nova Scotia, Canada and it is currently -8C. The air exchanger is piping in this very cold air and we have to turn up the heat on cold days to compensate. Can we turn off the Air exchanger … read more
HVAC_Doug
HVAC_Doug
Vocational, Technical or Trade Scho
condensate running out of trough rather than going to discharge
condensate running out of trough rather than going to discharge tube, ending up on floor. what can I do… read more
Mark Henley
Mark Henley
HVAC Controls DDC
3,209 satisfied customers
I have a Ruud 84-HRV100 and for some reason the outside air
I have a Ruud 84-HRV100 and for some reason the outside air damper is always closed. What is the issue and how do I get it to draw outside fresh air?… read more
Mark Henley
Mark Henley
HVAC Controls DDC
3,209 satisfied customers
high suction pressure 130 plus low discharge pressure 150.
high suction pressure 130 plus low discharge pressure 150. No heat outside coil freezes maybe a bad compressor. Not running 80 low and 150 high… read more
HVACguy
HVACguy
Vocational, Technical or Trade Scho
18 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