HVAC

Have HVAC questions? Ask an HVAC Expert for answers

Ask an Expert,
Get an Answer ASAP!

Tried to turn heat on and ERR 90 is on thermostat. Just

Customer Question
Tried to turn heat...

Tried to turn heat on and ERR 90 is on thermostat

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

Just bought this house and no manual. What should I check on thermostat settings?

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

Was going to try

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

I don’t think so. AC works fine

Submitted: 5 months ago.Category: HVAC
Show More
Show Less
Ask Your Own HVAC Question
Customer reply replied 5 months ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call.
Customer reply replied 5 months ago
Let me know if you need more information, or send me the service offer(s) so we can proceed.
Answered in 20 minutes by:
3/30/2018
HVAC Technician: Phil, Mechanical Engineer replied 5 months ago
Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 7,426
Experience: Retired HVAC/ Electrical & Boiler contractor. Industrial
Verified

Hello, I need the brand and model number of the furnace/air handler and the brand and model number of the thermostat (you can gently pry it from its wall mounted sub base and read the brand and model number from the back of it).

.

With that information I will be able to pull the manual on the equipment that has the error code read outs in it,

,

You should know however that in most cases, the error code is a result of a failed component and repairs will be required, Tell me if you are technically skilled or not so I can be most effective in guiding you,

We can go from there

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: 7,426
7,426 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

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

1,024 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 need a manuel for a gas pack unit to see the wiiring
I need a manuel for a gas pack unit to see the wiiring diagram. Model number ycx03F1H0AB … read more
gotoman for ac
gotoman for ac
HVAC Service manager and owner
Associate Degree
4,135 satisfied customers
I connected the red and black wires in the center lugs and
I connected the red and black wires in the center lugs and tested thermostat wire for 24 vac and nothing… read more
Bill
Bill
Service Mgr
114 satisfied customers
Housekeeper accidentally locked thermostat. Don't have PIN.
Housekeeper accidentally locked thermostat. Don't have PIN. Need to reset as heat is running.... getting hot!! … read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
I am trying to replace a train baystat 240 thermostat with a
I am trying to replace a train baystat 240 thermostat with a Honeywell RTH221B thermostat. On the old one the wiring is R O G Y X2 W. There is no X2 spot on the new one… read more
gotoman for ac
gotoman for ac
HVAC Service manager and owner
Associate Degree
4,135 satisfied customers
I have an f8024 white rodgers, i am renting right now but
I have an f8024 white rodgers, i am renting right now but the unit worked last summer, i just replaced the batteries, but when i press the temp down button, nothing happens. … read more
Iohn Keffer
Iohn Keffer
HVAC Tech
Associate Degree
75 satisfied customers
I replace a old thermostat w a new onetcont803as32daa. It
I replace a old thermostat w a new onetcont803as32daa. It does not work..was told that I had to program the new one..my ac unit Heritage 18..2a6h8060c1000aa.Can u help?… read more
Phil
Phil
Mechanical Engineer
Degree, Mech Engr Technology
7,426 satisfied customers
I bought a Harnock and Hersey ventless model 012159 in 2000.
I bought a Harnock and Hersey ventless model 012159 in 2000. I need a manual for some parts. The parts are made by Mertik Maxitrol. This fireplace has served us very well. I have tried manualslib and … read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
My forced air unit wont stop blowing. The heater part will
My forced air unit wont stop blowing. The heater part will shut down, however the blower just keeps blowing. After readjusting the thermostat over and over again, i was finally able to have the blower… read more
Expert
Expert
Billy. Currently having an issue with my unit. The heating
Hi Billy. My name is***** having an issue with my unit. The heating will not start even though the house temp is well below the thermostat setting.… read more
Phil
Phil
Mechanical Engineer
Degree, Mech Engr Technology
7,426 satisfied customers
I have central a\c and heat, thermostat in each room there
Customer: i have central a\c and heat , thermostat in each room there is no heat in living room or kitchen thermostats are set at 80* all other rooms are fine what could be the problem? … read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I am trying to wire a mach 8 in the old ac was a dometic
I am trying to wire a mach 8 in the old ac was a dometic without heat strip, how do I wire the 2 existing furnace wires in to the coleman?… read more
Phil
Phil
Mechanical Engineer
Degree, Mech Engr Technology
7,426 satisfied customers
Is the mother board Trane model ycd240b3lcjb serial no.
Is the mother board for the Trane model ycd240b3lcjb serial no.###-##-#### ***** have 9 relays instead of the original unit 4… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
My ac will not stay on it blows cold air only during the
my ac will not stay on it blows cold air only during the purge time then the led light on my zone board blinks green and the out side ac unit stops working ad the cold air stops blowing… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
All of a sudden both of my Venstar thermostats both stopped
All of a sudden both of my Venstar thermostats both stopped working. Tried to reconnect to wifi but it does not accept the WIFI connection. Help ?… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
Model580.54701500 dehumidator got hot, after cleaning filter
model580.54701500 dehumidator got hot, after cleaning filter &cool down it came on but not making any water… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
New rheem combo pack wont turn on. I have a 240 volt supply
new rheem combo pack wont turn on. I have a 240 volt supply and it needs 208 volts. what do i do?… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
My AC just went out. I have 2 zones and 3 thermostats,
Hello my AC just went out. I have 2 zones and 3 thermostats, all thermostats are blank (no battery back up), breaker is on and fine, there seems to be no power going to the main units inside including… read more
Phil
Phil
Mechanical Engineer
Degree, Mech Engr Technology
7,426 satisfied customers
Why can't we get this 3 ton York air handler board to communicant prop
Why can't we get this 3 ton York air handler board to communicant properly with a new 3 ton lennox heat pump/ac condenser board. when we call for ac we get heat mode.… 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