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No low voltage to t-stat. already changed transformer & float swtch. and replaced t-stat?????

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  • steve
    steve May 11, 2010

    Sounds like a bad wire to me. Check continuity on all stat wires,especially the red wire and common.



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Did you have line voltage to the transformer? Did you have 24volts on
the secondary side of the transformer?

Posted on Feb 04, 2010


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1 Answer

Honeywell thermostat problems

The power from the transformer that provides 24 volt low voltage to power the T-stat may be gone. Check the 3 amp fuse and/or transformer, both located in the air handler (where the blower fan is).

Sep 23, 2013 | Heating & Cooling

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Have two Broan exhaust fans that I want to wire to a programable hvac themostat.I'm told that I need a relay and not sure how they are wired. The fans draw 1.23 amps each and looks like they have

are you sure that your not looking at motor capacitor attached to each motor??? To use programable stat you would have to find line voltage stat with rating to handle fan amp . other option is to use low voltage stat and transformer and fan switching relay with fan motor wired through n/o contacts and relay 24v coil energized by low voltage stat.

Nov 25, 2012 | Heating & Cooling

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Transformer keeps blowing on the high side after about 15 Min? Have changed out many transformers and blower motor.

Replace the transformer with a 75va resettable transformer.
Check all wiring for a loose connection at the unit and the disconnect and the breaker panel.
Double check ground wires.
Check the low voltage side for a back feed short from a faulty component.
Could be caused from a bad thermostat wire.
Do a continuity reading on stat wires to look for a short.
Do an amp draw reading on the unit to determine an increase in amperage.

Jul 18, 2011 | Ruud UBHC Air Conditioner

1 Answer

Low voltage problem blew fuse and transformer

From what you are saying my first thought is that you have a short in the low voltage circuit....
Hopefully that model had a fuse on the low voltage of the circuit board and you did not burn out the transformer....check the circuit board for a fuse... it will look like a fuse used in many automobile applications...probably about 3-5 amp...DO NOT replace with a larger fuse!!!! You will burn up the transformer...
Then unhook the t-stat....most of the time the short is in that wiring...then jumper R to W on the circuit board and apply the power and see what happens this will tell you where the short is...
Then look for the shorted wire and fix... an OHM meter will help to find the short if you know how to use one...
If there was no fuse replace the transformer and add a fuse on the secondary larger then 3 amp.....then you can troubleshoot it...


Oct 22, 2010 | Heating & Cooling

1 Answer

I have a Trane model TWE030P13FBO that keeps blowing the 5 amp fuse tied into the transformer. Just to see if I could solve the problem I put in a 10 amp fuse and the transformer smoked and I'm sure now...

You have a short in the low could be the t-stat or the wiring to the t-stat...also could be the coil if a contactor, or a wire rubbed through somewhere...

To find it you need to start to isolate sections of the low voltage circuit and then ohm out each section...problem is that some will still not show up with out power applied... believe me this is not fun and can make ya pull your hair patient and persistent...
but as you found out do not try a higher amp fuse...transformers work on smoke...and when the smoke comes out they no longer work... :-)


Sep 15, 2010 | Heating & Cooling

1 Answer

I'm not getting any low voltage at the t-stat.

Make sure that the transformer has power on the primary side then check the secondary side for low voltage. If you have power on the primary and none on the secondary then replace the transformer.

Sep 05, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

I have no voltage to my thermostat

Hi, I am not positive the control voltage to your thermostat will be on a RV a/c, most homes are 24 volts. I know yours would be less. If you have a 2-wire stat and this a/c is not working, take the two thermostat wires a touch and hold them together. Don't worry as this is safe and will not shock you. If the unit comes on and runs, you do have voltage there but the meter may be set wrong. If nothing happens, then you need to find the breaker for this unit to see if it as tripped. Reset it anyway. If still no power, you will need to find the transformer for this unit and check for power to it which will be high voltage/primary and power out which is the secondary low voltage which controls all low voltage controls such as the stat. If you have a wiring diagram on the condenser up top or most RV have a large book that tells you about your coache. If you have a diagram look for the thermostat as it will be labeled in the legend as a T with a circle around it or it may say stat. Follow to see where it gos from there, to the transformer or what and let me know. If the unit does fire when you jump out the stat wires, you will have to replace the stat. Please keep me posted on this. You may have a blown fuse up top cutting off power to the transformer also. You can ohm them out also. Keep me posted so we can solve this.

May 11, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

I replaced my thermostat last night without

check for 24 volts ac at R & C terminals at the t-stat. Your transformer will have 4 wires hooked up to it. Two on one side and two on the other. Two of them will read either 120v or 240 v ac depending on whether you have a 120 or 240 v voltage. The other side should read 24 volts. If you are not reading 24 volts, then you have burnt the transformer and will need to replace it. If you are reading 24 volts, check to see if there a low voltage fuse located on the control circuit board or somewhere between the transformer and "R" terminal.
Here's a picture of a typical low voltage transformer found in an A/C system:

If you replace the transformer, add a 5 amp fuse on one of the 24 volt leads......this will save you from having to replace another transformer in the event of future "short" in the low voltage circuit.
Contact me with any questions or concerns.

I hope you find this to be very helpful to you moving forward,

Please leave a rating. :-)f0b3aee.jpg

May 09, 2010 | Heating & Cooling

2 Answers

No voltage to thermostat.none to condenser vltage.main voltage to con.ison.

Check for proper voltage to the unit , (generally 110VAC) check the transformer secondary for approx 24 volts. Verify the door switch is operating properly and that the door switch engages when the cover is put back on. if all of this proves good then check the wirtes going to the thermosta and the condenser

Jul 12, 2009 | Heating & Cooling

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