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Can the transformer blow burn out the thermostat

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It is highly unlikey but could have caused a spike of high voltage to the 24 volt side

Posted on Nov 22, 2013

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1 Answer

Thermostat fuse keeps blowing


The fuse protects the transformer from being damaged due to too much amperage, this is typically due to the circuit having a short or a device in that circuit being shorted.
See below the transformer's relationship to the thermostat.
The RED wire is the "hot leg" of the 24 volt power provided by the transformer to the thermostats R or RED terminal as pictured below.
The 24 volt hot leg enters the thermostat on R or RED.
The various other terminals White = heat, Yellow = cool ,
Green = fan and Common is the side of the 24 volt power source that every 24 volt circuit terminates or return to complete the circuit.
Thus the common name designated, note hoe everything returns to Common.
Well if we jumped Red directly to Common that is a short and will blow the fuse as you observe.
See the 2 diagrams in red describing a notrmal circuit then a short circuit.


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25510598-olwf3gt1n1i2ofytj5fivkso-4-2.png

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Mar 03, 2015 | Heating & Cooling

1 Answer

Control transformer keeps shorting out


One or more of the solenoids operated switches is your most probable cause. If you have a clamp on amp meter, measure the amps pulled by each component with a solenoid. The reversing valve solenoid and the main contactor solenoid. Each one of the these components are typically rated at 6watts. If your control voltage is around 25 volts, your amp draw should be about .24 amps max. If your transformer cannot be reset without blowing, install a 3 amp inline fuse so when the overload occurs the only thing that blow is an inexpensive fuse costing about 25 cents instead of a several dollar transformer. If your fuse/transformer immediately blows, try looking for a direct ground in the control wiring. If problems has persisted for a while, you may even have to look into replacing your thermostat wire. The control wire travels over the thermostat wire throught the thermostat and excess amps through the thermostat wire can break down the insulation jacket and short to the common wire causing the control transformer to blow. Another thing to check is the condition of your thermostat wire to check if the insulation is shredding off. Old thermostat wire, especially thermostat wire exposed to sunlight deteriorates quicker. Hope this helps.

Jan 10, 2014 | Rheem 14AJM49A01-RHSLHM4821 4 Ton 14.50...

1 Answer

Nothing working when thermostat turned on.checked voltage at transformer 110 at top and 24 v at bottom,cant figure out whats wrong .any ideas


Be the thermostat. Kill the power to the air handler so you do not burn the transformer. Remove the thermostat from the wall. Twist the red and white wires together and turn the power back on to the transformer. The heat should come on. If it does, the thermostat is bad. If it doesnt, do the same thing but twist the red, yellow, and green wires together and power the transformer up. The air should come on in cool mode.If it does come on then we know what to check next

Oct 27, 2013 | Goodman Manufacturing Goodman GMS81005CN...

1 Answer

My thermostat keeps blowing itself out


Electrical problem getting to hot ie burning out stat check transforme rvolts ?

Jan 24, 2013 | Heating & Cooling

1 Answer

The 5 amp fuse on the board keeps blowing the transformer smoked i replaced that but it still blows the fuse when i install a new fuse.the contactor buzzes then the fuse blows.


You ahve a short in the low voltage system, thats why the fuse blows and the transformer burned out. Find the short and then replace that fuse and that should solve your problem.

Jun 28, 2011 | Heating & Cooling

1 Answer

Not working keeps blowing transformer


If the transformer is blowing then you have the wires shorted somewhere. Trace down the thermostat wire and correct the short. To keep from ruining a transformer install an inline fuse on the low voltage side. How it works: transformer 101

Feb 10, 2011 | Heating & Cooling

2 Answers

Does the heatingroomthermostat have tobe installed by plumber or electerician


No it does no When you install just write down your colors that goto each terminal and follow the same thing when installing the new one. ONE big mistake that is amde and it happens all the time when someone tries to install a tstat and they do not turn power of to the furnace or Inside unit. This will blow the control fuse or burn up transformer if you short wires at tstat. Rus

Dec 05, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Will a short/ground in the thermostat wires cause a model(-) HQA to burn up the 24 volt transformer


If the transformer wires are shorted together, this will burn up the transformer. Normally transformers on the LV side (24 volt) are not grounded, but the solenoids that they control could be grounded, and a t-stat wire that is unintentionally grounded could burn up the transformer, but its not likely.

Jul 09, 2009 | Ruud Heating & Cooling

1 Answer

CARRIER AIR CONDITIONER/HEAT PUMP PROBLEM WOULD NOT RESPOND TO THERMOSTAT. UNIT IS AT LAKE HOUSE WHERE WE DO HAVE BAD STORMS. IN CHECKING, INSIDE PART OF UNIT HAD BURNED UP THE TRANSFORMER BUT NOT...


what I have always been told is if your 24 volt side burns out check the high volt side if the hi volt side burns out check the low volt side.

A quick way if the primary side is burningout due to a problem with the low volt side:
1 MArk all the thermostat wires at the indoor unit
2 Disconnect them at the indoor unit.
3 Check main line voltage before proceeding (A 208 volt is not considered 220V and 240v Is not considered 208V> In these circumstances the voltage may have changed with the power company replacing a transformer and now you need to change the main power input lines at your control transformer for the correct operating voltage). If okj then proceed:

4 If you have an amp meter attach it to one of the lines going to the transformer.
5 Apply main power and listen for hum, note if smell starts again and if so problem has to be in board or main incoming voltage too high or too low. Amp draw should be less than 3 amps.
6 If your to this point and still havent found any trouble in the above as of yet, Connect the wire marked "C" together. Then just touch the thermostat wires one at a time to the places where they go on the indoor unit and watch the amp meter. If you donmt see the meter jump the circut is probably ok but leave them disconnected until you touch all of them to the correct place or wire. Here is a possible problem I ahve seen a thermostat wireing problem if the wires are stripped too far and a "whisker" of the wire sticks out and allowes one of the other wires to cross short out. In this case just cut off the excess wire or bend it over out of the way asnd continue with the test. You can always cut it off later after the tests. If you see the meter jump up and stay up and /or blowes the fuse the wire that you used and it blew is where to consentrate.
7 No wiring problem found means that you could have a relay or contactor not pulling in properly.
and this will cause the amp draw to go way over the transformers power out put or VA rating.
8 Inspect the thermostat wiring for the "whisker" I mentioned above.
9 If you have done this to the end of the thermostat wires and your main incomming voltage is correctly wired in on the transformer andf your relays and contactors are pulling in evenly and not delaying excessively your problem should be fixed.

If this helps you please rate me as high as you can and thank you for using fixya.

Apr 24, 2009 | Heating & Cooling

1 Answer

RTH230B Thermostat


the transformer may be installed remotely to the furnace or may be a part of the honeywell burner relay. if you connected the thing between the transformer secondary common and hot it will surely blow the transformer.

Jan 31, 2008 | Honeywell Programmable Thermostat Heater

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