HVAC

Have HVAC questions? Ask an HVAC Expert for answers

Ask an Expert,
Get an Answer ASAP!

Related HVAC Questions
My Taco SR 504 switching relay is powered up ( light is on),
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 see… read more
Rick
Rick
Supervisor
24,889 satisfied customers
I need to replace the Zone 3 relay in my Taco SR504, but
I need to replace the Zone 3 relay in my Taco SR504, but there are five 28 volt relays and they are not numbered on the board -- or in Taco's documentation. … read more
Rick
Rick
Supervisor
24,889 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
Supervisor
24,889 satisfied customers
I have a Weissman boiler system radiant heat floor in the
I have a Weissman boiler system radiant heat floor in the house I bought which is about 20 years old. It is a large house but it seems the constant heat temperature in the fall months keeps the heat i… read more
HVAC Guru
HVAC Guru
HVAC TECH
19,186 satisfied customers
TACO SR504 I have 4 zones with circ pumps...1 is water. The
TACO SR504 I have 4 zones with circ pumps...1 is for hot water. The boiler cycles but does not fire now. If I call for heat the boiler works fine and the zonegets hot (circ pump runs) During this the … read more
Rick
Rick
Supervisor
24,889 satisfied customers
The Weather Dependent Control AM10 unit for my heating system
The Weather Dependent Control AM10 unit for my heating system seems to have no power coming to it. There's no display of the outside temperature. As the homeowner, is there anything I can do from here… read more
BillyHvac
BillyHvac
Journeyman Service Technician
State Licensed Mechanical Contractor
13,870 satisfied customers
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
Where should I place my thermostat in my 2nd story hallway?
Where should I place my thermostat in my 2nd story hallway? The one end of the hallway reads 2 degrees colder then the other end of the hallway. The colder end being on the CAC t-stat which is where t… read more
A-1 Tech
A-1 Tech
Service Manager
Vocational, Technical or Trade Scho
526 satisfied customers
Wiring Weil-Mclain Ultra 155 Boiler with 4 pumps? Manual wiring
Wiring Weil-Mclain Ultra 155 Boiler with 4 pumps? Manual wiring diagram allows only for 3 pumps 1 Boiler pump 1 DHW pump 1 baseboard radiation pump 1 in-floor radiation pump… read more
Rick Mather
Rick Mather
HVAC Technician
Vocational, Technical or Trade Scho
3,133 satisfied customers
Taco SR504 EXP zone controller. Power comes into the board,
Taco SR504 EXP zone controller. Power comes into the board, but the lights aren't lighting up. I replaced the fuse, but still nothing. Any ideas?… read more
Douglas
Douglas
Vocational, Technical or Trade Scho
3,087 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
Good morning! We have an old house, c.a. 1927, here in So.
Good morning! We have an old house, c.a. 1927, here in So. Cal. sometime in the 1940's-50's an gas floor heater was installed with a wall mounted thermostat about 15 ft. away. The heater is central to… read more
Rick
Rick
Supervisor
24,889 satisfied customers
Hi Mark I have a Honeywell L7224 and a Taco SR504EXP to wire
Hi Mark I have a Honeywell L7224 and a Taco SR504EXP to wire up. 4 heating zones and one DHW zone to connect for a customer. Can I use the 7224 C1/C2 for the first zone, and set the Taco SR504 Zone4 f… read more
Rick Mather
Rick Mather
HVAC Technician
Vocational, Technical or Trade Scho
3,133 satisfied customers
I have a TACO SR504 4 zone Switching Relay. One of the zones
I have a TACO SR504 4 zone Switching Relay. One of the zones keeps calling for heat even though the zone temperature is higher than the thermastat temperature setting. I disconnected the thermostat fr… read more
Rick Mather
Rick Mather
HVAC Technician
Vocational, Technical or Trade Scho
3,133 satisfied customers
I am going to list the items used in this application 1.
I am going to list the items used in this application: 1. Weil-McLain Ultra 155 with PHD technology (Gas fired) 2. Weil-Mclain Plus-Line 80 Indirect fired water heater 3. 8-Taco 007 circulators for zo… read more
Rick Mather
Rick Mather
HVAC Technician
Vocational, Technical or Trade Scho
3,133 satisfied customers
Hello, Ive just installed a RSA85 burnham boiler . It is
Hello, I've just installed a RSA85 burnham boiler . It is set up with a Taco rs504 relay panel. When I try to power up to bleed the oil line, the burner dooesn't start.. I get a 06 error code. It says… read more
Rick
Rick
Supervisor
24,889 satisfied customers
I have a Taco SR504 switching relay that keeps blowing the
I have a Taco SR504 switching relay that keeps blowing the one amp fuse. I have a Viesman furnace. Thanks, Albert.… read more
Mark Henley
Mark Henley
HVAC Controls DDC
3,216 satisfied customers
My Honewell aquastat used in a cold start boiler setup occasionally
My Honewell aquastat used in a cold start boiler setup occasionally makes a buzzing noise which stops with a couple of knuckle raps. All zones work correctly and have no problem with functionality. Th… read more
Rick Mather
Rick Mather
HVAC Technician
Vocational, Technical or Trade Scho
3,133 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.

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 >

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