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No heat due to short out of stat wires - Ruud Heating & Cooling

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Steve Darnell

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This is usually an easy fix if you know where the wires go. A short may have caused the breaker on the transformer to trip, if your transformer has one. You should verify you have voltage at the thermostat. Use a volt meter to check for 24 volts. Don't worry , it's not enough to shock you. if you do not have voltage, go to outside unit, pull panel and see if there is a reset on transformer. Hope this helps.

Posted on Feb 11, 2011

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The new wall heater will not go on. The pilot light is on. We replaced the thermostat and the heater came on but would not go off. We checked the wiring..all good. Any advise would be appreciated.


You need to preform a continuity check between your T-stat wires. More than likely, the wire that initializes the call for heat is grounded to one of the other wires. Also, if the unit worked fine prior to the initial problem, it's likely that you haven't purchased the proper t-stat for the unit. Wall heaters typically operate using a millivolt t-stat and not your typical heating stat you would find on a central unit. If you did purchase the correct stat, then more than likely it's not wired correctly, or you have a direct short, as mentioned above, in the wiring.

As usual.....when dealing with electrical, no matter how low of current, please turn off the gas and any electrical current that the unit may have prior to servicing.

Feb 04, 2017 | Heating & Cooling

1 Answer

My(38ycc030340)carrier heat Pump ac unit blows 5 amp fuse on board in handler in attic when switch stat to heat.


Miss wired or shorted low voltage wiring. Have you changed stat? Animal chewed wires at foundation wall or in attic?

Oct 10, 2016 | Carrier Heating & Cooling

1 Answer

Have a CT3600A4444 Stat. When I went to turn on heat it blew the 24v fuse. Fuse stay ok when stat is not plugged in housing, blows when stat is put back in housing.


You have something shorted with the W1 terminal. This could be the thermostat wiring or something with the heater control board, relays/contactors etc. You must use a voltage/ohm meter to trace the short out (the short will either be in the coils of the relays, contactors, boards or wiring is touching ground). The problem is not your thermostat. ensure that none of the wires leading into the back of the t-stat are touching the bare metal of another wire, make sure the wiring insulation is not split and touching another wire. Most of all be careful when working around live wiring (electricity applied). If your not comfortable working around electricity, please use a certified repair person. Safety first!!!!!

Sep 23, 2011 | Honeywell Programmable Thermostat Heater

2 Answers

My Janitrol GU125-4 furnace will not shut off; cannot be turned off at thermostat, and heats the house to 80 degrees. I have to cut it off at the breaker. What is the fix?


Hi, it sounds like you may have a short in the thermostat or in the wires coming from the thermostat. The red and white wires are for heat. If you open the filter door, there should be terminal screws labeled R, W, Y, G and the 4 or 5 strand t-stat wire going to it. Just disconnect the W wire and replace the door, if the heater stays off you have a short somewhere in the thermostat circuit. Unless you just replaced the T-Stat recently, a rodent may have chewed through the wire or a nail pierced the wire, or ???,  you get the idea. You may need to pull a new T-Stat wire.  Good luck and comment back if you have any other questions.

Jan 09, 2010 | Goodman Heating & Cooling

1 Answer

The heat keeps going on and does not stop at the programed temp


TAKE APART TSTAT IF U HAV ALL WIRES SEPERATED AND IT STILL RUNS ITS NOT THE STAT THEN U TAKE APART STAT WIRES AT UNIT IF THAT SOLVES IT THEN UR HOT AND HEAT STAT WIRE ARE SHORTING TOGETHER AND U NEED TO PULL NEW WIRE IF IT STILL RUNS WHEN WIRES ARE PULLED ATN UNET THEN U MIGHT HAV A BAD VALVE HOPE THIS HELPS U

Dec 27, 2009 | Honeywell CT87B ROUND HEATING&COOLING...

1 Answer

Heater dont work


At the thermostat, jump R to W and if it heats, then you have a loose connection at the t-stat or a faulty t-stat. If it don't, you may have a blown blade style fuse(car style fuse 3 or 5 amp), damaged transformer(both due to a low voltage short), damaged control board, loose connection at the control wiring, blower door switch not closing or damaged, induced draft motor issue(try giving it a spin). Please work safe and I hope thus helps!

Oct 12, 2017 | Heating & Cooling

1 Answer

Crazy Heat


I think that I would change out the thermostat only due to the symptoms you are describing. Think the control board may be fine however, the thermostat sounds as if the internal componants are going out. Good luck on your repairs

Dave

Sep 22, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

I have a 3 ton Coleman heat and air pump and when I turn the air condition on the heat strip comes on at the same time


If you are calling for heat and the thermostat is set for 2 degrees higher than room temp, the heat pump and strips come on.
When the room temp and stat temp are less than 2 degrees the strips turn off.
That is, unless the installer wired the t-stat for the strips to stay on.
If they are coming on in the air/cool mode then you have a bad heat relay or a t-stat wire shorted.

Mar 11, 2009 | Coleman Heating & Cooling

1 Answer

No heat new thermostat


you have a short in the wireing.disconnect at air handler and hook-up short t-stat wire to t-stat,ifok chk wire to condenser

Jan 10, 2009 | Heating & Cooling

1 Answer

I have a coleman evcon t-stat that is using 7 wires. I want to switch to a honeywell th3110d non-programmable t-stat but don't know where the wires should go.


The most common wiring is: This sometimes varies as to installers preferance.
Red wire is your supply power to the T-stat. R terminal
Green wire is the blower fan. G terminal
Yellow wire is compressor contactor Y terminal
older units used a blue wire to Y
White wire is heat auxilary or black wire W terminal
Orange wire is reversing valve O terminal
Blue wire is the common C terminal
Black wire can be emergency heat E terminal
Best thing to do is replace wire for wire from t-stat to t-stat
or write down the colors to which terminal on the old t-stat and match to the new. make sure you SECURE POWER to the Air Handler, furnace and condenser before replacing any t-stat.
It is very easy to short the wires out if the power is left on and take out your A/H low voltage fuse or transformer.

May 18, 2008 | Heating & Cooling

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