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Why is my 24 volt transformer buzzing very loud all the time ?

Switching it on and off

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  • Contributor
  • 15 Answers

Transformers usually do that, but if it is in an area with moist, humid air or its old then you should replace it.

Posted on Dec 11, 2014

6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

  • 234 Answers

SOURCE: AC Control Transformer keeps failing.

well it has blown the fuse on the transformer, then you have coil switch bad.It could be the coil on the contath in for cooling.But can check by taking the yellow wire a loose and see if the don't blow. The red wire is one side of the transformer and the com could be any color.But look at the red wire because it is the main wire that travel the voltage throuhg the unit.

Posted on Mar 26, 2009

t1m130
  • 86 Answers

SOURCE: Blown Transformer heat pump

blown transformers are usually from a low voltage short the first thing i would do is wire a automotive or resetable 3amp fuse in line with the transformer so you dont blow transformer after transformer the wire coming off the transformer that say 24v take that wire a couple of inches down and cut it and install the fuse in series there
24v----------------
24v----------x----------
24v--------{3ampfuse}----------

now you can go through your low voltage wires one by one and test them unhook all the wires to your outdoor condenser at your indoor unit(furnace or airhandler) and try turning it to cool now if you blow the fuse the short is between the tstat and the indoor unit if the fuse is still good leave it on cool and hook up one wire at a time to your outdoor unit starting with R a lot of times your contactor or your defrost board will short out on you also look for pinches in wires wires with cracks in the insulation and wires touching metal this situation can be a real pain sometimes i would recommend calling a hvac company if you start to get stumped
hope this will help you

Posted on Jul 26, 2009

guru_fixya
  • 944 Answers

SOURCE: I need a wiring diagram

Hi,

This is the only site which provides wiring diagram related to Coleman.

Coleman does not provide any online diagrams...

http://colorcodes.flagsolution.com/colemanwiringcolorcodes/


For 24 volt transformer:
http://www.google.co.in/images?um=1&hl=en&biw=1912&bih=825&tbs=isch:1&aq=f&aqi=&oq=&gs_rfai=&q=coleman%2024%20volt%20transformer%20wiring%20color%20codes

For RBM relay:(Common not specific to Coleman)
http://www.google.co.in/images?um=1&hl=en&biw=1912&bih=825&tbs=isch%3A1&sa=1&q=RBM+relay+wiring+color+codes&aq=f&aqi=&aql=&oq=&gs_rfai=

Hope this can help you.

post a comment for further assistance.
Thank you for using fixya have a nice day:-)

Posted on Sep 01, 2010

heatman101
  • 43501 Answers

SOURCE: no voltage from 24 volt transformer power in no

Hi,
The transformer is burnt out... you will need to replace it... this is common and they burn out easily if a low voltage wire it shorted even for a split second, or if there is a brown out...

They best way to prevent this is by installing a 5 amp fuse ahead of the transformer in the high voltage line so that it blows before the transformer goes...

heatman101

Posted on Sep 08, 2010

  • 1033 Answers

SOURCE: what are the tolerances of

Hello, a 24 volt transformer can handle a tolerance of about 10% or just a little under. The important thing to remember about transformers is to always replace one with the same VA rating ( VOLT-AMPERE)

Posted on Feb 18, 2011

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1 Answer

Loud buzzing coming from transformer


Buzzing is a cue that the transformer windings are loose. Time to replace it if you want silence.

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Why is unit making a buzzing noise that stops only when the interlock switch activates by opening the door?


When the door is open the safety switch turns off power.
1. low voltage transformer may be the culprit. Also a bad fan relay.
very carfully with door off off close safety switch with a insulated probe touch transformer and listen for the buzz.
2. with the transformers it can be a common problem. Check for loose mounting screws.
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Air conditioning thermostat not functioning


ab302475-b998-41c7-9c7c-4e106b68e0be.pngGo to your thermostat and look at the FAN switch, it will be in the AUTO position typically.
Set the FAN switch to the ON setting,
by doing this if the fan motor operates you know that the High voltage & the low voltage (24 volt control power) are present.
This saves you from having to go to the breaker panel and checking / resetting the breaker as well as checking the Transformer and automotive type 3 amp control circuit fuse (generally on the circuit board).

If you do not get any fan operation by switching the fan switch to the ON setting, you then will have to determine if the breaker, transformer and aforementioned 3 amp fuse are all good.

You will need a volt meter to test further.
At the thermostat remove the cover thus exposing the thermostats sub base and assorted circuits/wiring.

RED or R
Red is the 24 volt "hot leg" of 24 volt power which originates at the transformer. Red enters the thermostat on the Red or R terminal, some thermostats will have an RC and an RH terminal, these are jumpered together on single transformer systems as they are for Red Cool and Red Heat, without a jumper wire on RC and RH, the Red "hot leg" of the 24 volt control voltage will only energize the terminal its wired to, some stats are battery powered and do not use the transformers 24 volt power (parasitically) to power the thermostat.
If the thermostat is powered by the transformers 24 volt power, there will be a "COMMON" wire on the common terminal of the thermostat, this is the other side of the 24 volt power from the transformer, the side opposite from RED the 24 volt "hot leg"
Common is called common as its the side of power that EVERY
24 volt circuit terminates, or completes its circuit, thus the COMMON designation.
During a Heat call the 24 volt hot leg is sent out via the white/heat terminal to the gas valve etc.
So between terminals Common & White , it should read 24 volts during a call for heat.
Same for Fan which is the Green or G terminal,
Same for Cool which is the Yellow or Y terminal.
If you have no power to these terminals when calling for heat or cool or fan then yes the thermostat is defective and requires replacement.
DO NOT let the RED wire touch ground or the COMMON terminal, this is a direct short and blows the fuse or transformer
if not equipped with fuse protection.

Normally you should read 24 volts between RED and COMMON

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No water flow into the filter


Hello. the first thing you need to determine is if the solenoid is getting 24 volts when the furnace turns on, you should be getting 24 volts at the solenoid valve. If not you need to start at the transformer and see if you are getting 24 volts there, if not then most likely the transformer is bad and must be replaced, if you are getting 24 volts at the transformer then check the wiring and make sure it;s tight. also check the humidistat and sail switch/ current sensing relay to make sure they are working properly. If you are getting 24 volts at the solenoid valve and is not allowing water thru than it must be replaced.

Feb 22, 2011 | General Filters 1099-LH Humidifier

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Water is not getting to the humidifier. Unit does not appear to be turning on when furnace starts


Check to see if you are getting 24 volts at the solenoid valve, if you are then the solenoid valve is bad and needs to be replaced. If you are not getting 24 volts at the solenoid valve then check to see if 24 volts is present at the transformer, if it is then check the wiring to make sure it's tight, humidistat, and current sensing relay/ sail switch. If you are not getting 24 volts at the transformer then turn off power to transformer and set your meter to continuity and check the secondary sie of the transformer, you should get resistance if not the transformer is bad and must be replaced.

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1 Answer

My totaline digital 2 stage thermostat keeps buzzing. I have to turn the whole a/c unit off to get it to stop. Lately it hasnt helped much as when I turn it back on it is still buzzing. Help


Hi, relays will also buzz causing units to loose transformers, I have seen this in the past years also. A 2-stage heat-pump stat? I would remove the front to expose the wiring terminals and pull the hot wire red, 24 volts and that should kill the buzz. If so, the circuitry is going out and you will need a new thermostat. I would, if you have a volt meter check the incoming voltage to the stat to make sure it doesn't exceed the proper voltage rated on the cover. Max would be 30 volts ac. If its over that, the transformer is putting out to much on the secondary side and should be replaced, or it will eventually take all of the low voltage controls out. Try removing the 24 volt hot wire and also if you have a friend that has a meter or you do, check the voltage coming in to the stat. Get back to me if it exceeds the rating, as this will cause the buzzing. It may just be faulty contacts in this stat also. I wish you the best, and ask that you are kind when rating me in helping you. Please keep me posted if you need my help.
Sincerely,
Shastalaker7
A/C Heating & Refrigeration Contractor.

Jul 03, 2010 | Heating & Cooling

1 Answer

Ac not working


The buzzing sound, along with the fan motor not running, usually indicates low voltage to the contactor and the contactor is not engaging or closing the points and it usually buzzes when this happens.
You first need to check and see if you are getting 24 volts to the contactor coil. You should at least have 21 volts, if not check for loose or dirty connections, if none, check the voltage at the transformer to see if you're getting 24 volts there.

Jun 04, 2010 | Heating & Cooling

1 Answer

I tring to change thermosat I can not remeber what color go where


Typical Thermostat Wiring for 4 or 5 wire Heat/Cool Thermostat (not heat pumps)
4 Wire Termostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
with one transformer for both units
Rc One Side of 24 volt Transformer
Rh Jumper Rc to Rh
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
With 2 transformers one for indoor unit
And one for outdoor unit
Rc = Red One Side of (outside) 24 volt (outside transformer)
G = Green Blower (outside transformer)
Y = Yellow Cool (outside transformer)
Rh = Blue One side of (inside) 24 volt (inside transformer)
W = White Heat (inside transformer)
COOLING ONLY Thermostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
HEATING ONLY
R or Rh One Side of 24 volt Transformer
W = White Heat

Feb 09, 2010 | Heating & Cooling

1 Answer

Trying to figure out thermostat wiring diagham on a split system


Typical Thermostat Wiring for 4 or 5 wire Heat/Cool Thermostat (not heat pumps)
4 Wire Termostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
with one transformer for both units
Rc One Side of 24 volt Transformer
Rh Jumper Rc to Rh
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
With 2 transformers one for indoor unit
And one for outdoor unit
Rc = Red One Side of (outside) 24 volt (outside transformer)
G = Green Blower (outside transformer)
Y = Yellow Cool (outside transformer)
Rh = Blue One side of (inside) 24 volt (inside transformer)
W = White Heat (inside transformer)
COOLING ONLY Thermostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
HEATING ONLY
R or Rh One Side of 24 volt Transformer
W = White Heat

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1 Answer

Sears 92 gas furnace noise when not in air handling mode


a very subtle hum or buzz is normal and is the transformer that creates 24 volt control voltage continually. some are noisier than others . sometimes a tap or bending of the transformer will tweak the metal enough to make it quieter. they can also get loud if incoming voltage is not correct. incoming 120 volts on a furnace is not usually a problem but the transformers are usually wired to the available incoming 230 voltage or 208 voltage if it is a heat pump or electric heat. If it is powered by 230 or 208 volts as most heat pumps are ,then you need to verify which you have and connect the appropriate leads from the trans former to power . it tells you on the side of the transformer which to connect to 230 and which to connect to 208. tape or cap off any unused leads.since you have not mentioned any performance problems i assume the fan does come on when called for and that it is not the loud hum you hear. switching the fan switch at stat to on should bring the fan on right away. if it doesn't then you may hear a loud hum and then youll need to check the fan motor and capacitor. but it sounds like a noisey transformer from here.

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