HVAC

Have HVAC questions? Ask an HVAC Expert for answers

Ask an Expert,
Get an Answer ASAP!

Carrier 5a fuse on hybrid 48z unit. Blew again after a few…

Customer Question
Carrier 5a fuse blown on...
Carrier 5a fuse blown on hybrid 48z unit. Blew again after a few hours. Replaced with 7.5a and ran for 5 hours and 3 calls for heat then blew. .is it a relay that needs replaced? If so, What part #? Or would 10a fuse be within SF of design to not cause damage?
Submitted: 2 years ago.Category: HVAC
Show More
Show Less
Ask Your Own HVAC Question
Answered in 2 minutes by:
1/19/2016
HVAC Technician: HVAC Guru, HVAC TECH replied 2 years ago
HVAC Guru
HVAC Guru, HVAC TECH
Category: HVAC
Satisfied Customers: 18,747
Experience: 20yrs in the HVAC industry with certificates and degrees.
Verified

Hello and thanks for using this service, if you have been waiting do not worry or get upset I am just one of the techs on here and I try to get to as many customers as I can and I just picked up your question now. Please give me time to respond sometimes I get your replies late so there may be a delay in my response.

You have a short in the low voltage wiring somewhere. You have a wire that might have rubbed through to ground or another wire. I would check the thermostat wires carefully. If they are all good the main contactor relay could be drawing too much current. I would not put a higher amp fuse in it or you will melt a wire.

We are on the honor system for our time, all I ask is please rate my service using the STAR RATING LINK on your page before you leave. If you are not happy with the service please let me know before leaving a negative rating. This is the only way I am paid or credited through the site for my time. This will also allow you to get directly back to me for FREE follow up questions and tips are greatly appreciated! Thanks

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 HVAC Guru Your Own Question
HVAC Guru
HVAC Guru
HVAC Guru, HVAC TECH
Category: HVAC
Satisfied Customers: 18,747
18,747 Satisfied Customers
Experience: 20yrs in the HVAC industry with certificates and degrees.

HVAC Guru 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

7,634 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 have a Trane XC80/XL19i system with a W/R 50v61-507
I have a Trane XC80/XL19i system with a W/R 50v61-507 control board on the furnace. initial sympton is a blown 5A low voltage (LV) fuse. If I remove the Honeywell TH8320V1008 thermostat from the wall,… read more
Gaztech
Gaztech
Technician
Vocational, Technical or Trade School
1,974 satisfied customers
My window ac while turned off just started making a noise
my window ac while turned off just started making a noise and blew the circuit. any ideas why or how? … read more
Gaztech
Gaztech
Technician
Vocational, Technical or Trade School
1,974 satisfied customers
I have a furnace that is doing 2 quick 4 on the furnace led
i have a bryant furnace that is doing 2 quick 4 long on the furnace led light. what does this mean … read more
WCohn
WCohn
Journeyman Plumber
Journeyman License
1,738 satisfied customers
I turned the furnace off (Carrier Model 59SC2B) at the breaker
I turned the furnace off (Carrier Model 59SC2B) at the breaker to install a Nest thermostat (not my first install) and now the furnace will not turn on. Does it have a pilot to restart? How do I resta… read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
Can a certified TRANE tech help me? 5V fuse keeps blowing
Can a certified TRANE tech help me? 5V fuse keeps blowing on Trane XR80 Setup: -Trane XR80 model DD1C120A9541A Furnace -Trane 2TXCC049AC3HCAA sitting on top of the XR80 (49,000 btu?) -Carrier 38TKB048… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
My air/heat will not turn on. My dad found a blown fuse in
My air/heat will not turn on. My dad found a blown fuse in the furnace. When he replaced it the unit turned on for about 3 minutes, when then again the fuse blew. What would be causing this and is it … read more
Phil
Phil
Mechanical Engineer
Degree, Mech Engr Technology
7,634 satisfied customers
I am getting code 14 for our carrier HVAC - it appears to be
I am getting code 14 for our carrier HVAC - it appears to be a code calling for heat problem but the system should be calling for cooling is there a simple reset I can do to bring the air back on?… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I just had a carrier 58uvb series 120 installed and the 3amp
I just had a carrier 58uvb series 120 installed and the 3amp fuse has blown after two hours operation now 3 times the last time was when it reached temp and I raised temp to restart, the previous time… read more
MagiicAir
MagiicAir
HVAC Service Supervisor
Vocational, Technical or Trade Scho
110 satisfied customers
I have a carrier heat pump. having problems in the air handler
I have a carrier heat pump. having problems in the air handler mod # XXXXX keeps blowing the 5 amp fuse on the control board. Replaced board, ran fine for about a hour, blew the fuse, replaced, blowed… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
My Taco SR503 blew its .5 amp fuse controlling the pump for
My Taco SR503 blew it's .5 amp fuse controlling the pump for one of my two heat zones. I replaced the fuse but it blew again the next morning after working for a couple hours. The pump is a B&G Series… read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
13 Dec 2010; I have a Trane total electric heat pump model
13 Dec 2010; I have a Trane total electric heat pump model 4TEE3F49A1000AB; 3/4 HP; 220V. The thermostat has several numbers: T8011R1055(2); TAYSTAT540; 0310 2B. I believe the unit is about 9 years ol… read more
gotoman for ac
gotoman for ac
HVAC Service manager and owner
Associate Degree
4,135 satisfied customers
My White Rodgers control Board 50A55-486 runs an American Standard
My White Rodgers control Board 50A55-486 runs an American Standard House Pack Unit. It seems that the 5A Fuse on the Board keeps blowing? Any Suggestions? The Condensor initiates and then shuts down (… read more
Mark Henley
Mark Henley
HVAC Controls DDC
3,209 satisfied customers
11 yr old Payne, Model PF1MNA060 keeps blowing 5 amp fuse located
11 yr old Payne, Model PF1MNA060 keeps blowing 5 amp fuse located on circuit board. As soon as I turn the heat on, the fuse blows. A couple of times I replaced the fuse and it ran for awhile but as so… read more
gotoman for ac
gotoman for ac
HVAC Service manager and owner
Associate Degree
4,135 satisfied customers
I have 2- Xl14i Condensers and a 4tee Variable speed air handler
I have 2- Xl14i Condensers and a 4tee Variable speed air handler with electric heat. Every year when I need to use the heat the system blows one of the 2, 60amp time delay fuses. I have had it checked… read more
gotoman for ac
gotoman for ac
HVAC Service manager and owner
Associate Degree
4,135 satisfied customers
Hi. I have a 2006 carrier infinity system with 4 zones. All
Hi. I have a 2006 carrier infinity system with 4 zones. All carrier equipment. The keypads were blank yesterday. I replaced the 3a fuse. everything was fine. This evening, when I got home from work, t… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
Attended service call for Carrier RTU Moel 48TJE008-511QE.
Attended service call for Carrier RTU Moel 48TJE008-511QE. No Function Unit Dead Found 5 Amp Blown Fuse on Control Board replaced fuse unit Ran For few minutes & went out again.… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I replaced the transformer in my AC Unit/Heat Pump a few weeks
I replaced the transformer in my AC Unit/Heat Pump a few weeks ago. The 5 amp fuse blew, I changed it, the unit ran for about 5 hours and then shut down. The fuse was not blown that time. I tried to p… read more
Glenn
Glenn
Maintenance, Technician
Associate Degree
1,612 satisfied customers
Carrier FA4 keeps blowing 5A fuse on HK61EA002 control board.
Carrier FA4 keeps blowing 5A fuse on HK61EA002 control board. Swapped control board… same problem. Isolated wiring from outside unit which seems to have a short in the 24V wiring, but still cannot run… read more
Rick or Nick in Texas
Rick or Nick in Texas
General Manager-Lead Tech
Own and run HVAC business 29yrs
44 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