HVAC

Have HVAC questions? Ask an HVAC Expert for answers

Ask an Expert,
Get an Answer ASAP!

My Taco SR 504 switching relay is powered up ( light is on),

Customer Question
My Taco SR 504 switching...
My Taco SR 504 switching relay is powered up (green light is on), but none of the zones are working (red lights off).
The thermostats upstairs are all brand new and working, and the digital valves seem to be working as well.
Any ideas??
Submitted: 8 months ago.Category: HVAC
Show More
Show Less
Ask Your Own HVAC Question
Answered in 3 minutes by:
11/11/2017
HVAC Technician: Rick, HVAC Supervisor replied 8 months ago
Rick
Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 24,398
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.

Try jumpin the thermostat terminals on 1 zone on the SR504. Does the red LED light 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: 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

1,019 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
I have a taco SR 504 the light is on Zone 4 light is red and
I have a taco SR 504 the green light is on Zone 4 light is red and the boiler wont fire … read more
Rick
Rick
HVAC Supervisor
24,398 satisfied customers
I had a taco sr504 that one zone was not working. I switched
I had a taco sr504 that one zone was not working. I switched thermostats from other zones , jumped out that zone, switched contactor relays etc. I called taco and they said it was probably a bad board… read more
Rick
Rick
HVAC Supervisor
24,398 satisfied customers
I have a gas fired boiler with two zones. There is a taco
Hello. I have a gas fired boiler with two zones. There is a taco zone relay controler controlling two circulators for the zones. However there is no connection between the Taco and the boiler. Thermos… read more
Rick
Rick
HVAC Supervisor
24,398 satisfied customers
I have a weil mclain oil fired hotwater boiler with 2 zones.
I have a weil mclain oil fired hotwater boiler with 2 zones. the upstairs zone will not shut off even with the thermostat down I switched thermostats witch are new with no result. any suggestions? my … read more
Rick
Rick
HVAC Supervisor
24,398 satisfied customers
I am trying to wire a Taco SR-504 (New) to an existing
I am trying to wire a Taco SR-504 (New) to an existing Honeywell Aquastat and Honeywell RA89A on a New Yorker Furnace.… read more
Rick
Rick
HVAC Supervisor
24,398 satisfied customers
Buderus Logamax plus GB142-24 is repeating a "Low Battery"
Buderus Logamax plus GB142-24 is repeating a "Low Battery" audio alert, while system is functioning normally and thermostats all received new batteries within the last 48 hours, after this same alert,… read more
Rick
Rick
HVAC Supervisor
24,398 satisfied customers
good afternoon. i have a weil mclain gold oil furnace/boiler
good afternoon. i have a weil mclain gold oil furnace/boiler system (wtgo-3 or 3r) for my two zone forced hot water baseboard heat. there are two sep thermostats, there is a SR-501 1 zone switching re… read more
Rick
Rick
HVAC Supervisor
24,398 satisfied customers
I have a boderus boiler with a taco sr 504 switching relay
I have a boderus boiler with a taco sr 504 switching relay and am trying to install a HW RTH 6590 wifi thermostat which needs continuous power. Have a hard wired "c" wire in the wall which ends in the… read more
Mike
Mike
Service Tech/ Installer
High School or GED
149 satisfied customers
I currently have 4 Furnas two pole relays to energize 4 zone
I currently have 4 Furnas two pole relays to energize 4 zone valves and 4 Taco circulating pumps being fed from my Weil Mclain boiler. The boiler has an indirect tank and a on board Taco circ. pump to… read more
Rick
Rick
HVAC Supervisor
24,398 satisfied customers
Rick I have a red light indicator on my relay switch
Rick I have a red light indicator on my relay switch 2 which is my down stairs thermostate - the upstairs thermostat and zone one is green and working any ideas… read more
Rick
Rick
HVAC Supervisor
24,398 satisfied customers
I have a Taco 2 zone sr502 and the red light is on for zone
I have a Taco 2 zone sr502 and the red light is on 1. However, the oil furnace comes on psi is 13 and temp is 180, but there isn't any heat, coming from any of the radiators in the whole house.… read more
Rick
Rick
HVAC Supervisor
24,398 satisfied customers
I have a Burnham Alliance SL indirect water heater and a taco
I have a Burnham Alliance SL indirect water heater and a taco Zvc406 Zone Valve Control. How do I wire the switching relay. The SR-504 instructions will probably work, but I do not know where to draw … read more
Rick Mather
Rick Mather
HVAC Technician
Vocational, Technical or Trade Scho
3,133 satisfied customers
My old thermostat was removed because it was causing the heat
My old thermostat was removed because it was causing the heat to come on when it should not. It was removed completely and I cannot now find it to even tell you what kind of thermostat it was.I'm tryi… read more
Rick
Rick
HVAC Supervisor
24,398 satisfied customers
just changed from a honeywell mercury thermostat (red/white
just changed from a honeywell mercury thermostat (red/white wires hooked up, but green cut back) to a honeywell 5/2 programmable RTHL2310B model, no joy!… read more
HVAC_Doug
HVAC_Doug
Vocational, Technical or Trade Scho
I have a Taco SR504 wired as a to an SR506. All has worked
I have a Taco SR504 wired as a slave to an SR506. All has worked well for 4.5 years, but this year one zone powered by the 504 does not come on. The monitor light for that zone doesn't light. Swapping… read more
Rick Mather
Rick Mather
HVAC Technician
Vocational, Technical or Trade Scho
3,133 satisfied customers
I have just replaced my old Honeywell round thermostats with
I have just replaced my old Honeywell round thermostats with the new T8775A round digital thermostats. I have Taco zone valves and have installed the resistors as instructed. The thermostats seem to b… read more
servtech50
servtech50
HVAC/R service tech
216 satisfied customers
I have a Taco PC 702 controlling two Weil McLain Gold GV boilers.
I have a Taco PC 702 controlling two Weil McLain Gold GV boilers. The 702 is powered off a Taco SR 506 (which has a SR 504 slaved off of it). The 506 drives some zone pumps when the zones come on. I'm… read more
Rick Mather
Rick Mather
HVAC Technician
Vocational, Technical or Trade Scho
3,133 satisfied customers
my gas boiler has 3 zones (one of which was added last year).
my gas boiler has 3 zones (one of which was added last year). That zone is giving heat, the other 2 older zones are not. why is this?… read more
Rick
Rick
HVAC Supervisor
24,398 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