the without change part is the most difficult part of the answer. Change the valve. Mine was less than $100.
You have a runaway gas valve-the other contributor is right-replace the gas valve asap.
How does it work without turning on? Please update the question to specifically what you want an answer to.
turn breaker off. unhook thermostat wire to furnace turn breaker on. worth a try; if it works you will have to turn off breaker to shut it down.
If the thermostat has failed it will need replaced.
I had mine replaced and the cost of the thermostat and housing was $48.67 without the cost of labor.
$500 without the thermostat $750 with Thermostat $1000 with all hoses replaced
Every Electrical Furnace run by Electrical Current. Without electricity we can't use any type electric furnace. Sometechnical knowledge must be required for maintenance of electric furnace. Spare parts availability like Heating elements/resistance wire, Thermostat/Temperature controller (maybe Digital or Blind controller, Contactor, Insulators etc.
You can buy a new thermostat at Home Depot or Lowe's, or even your local hardware store. They will cost around $20 (low end) for one without the central air options. You can order online too: http://www.thermostatshop.com/honeywell.shtml
A thermostat that is stuck in the closed position is a very common cause of overheating. A new thermostat should be installed every time the coolant is changed.
I am guessing by the question you want either of these stats to be able to start the furnace, without using a relay. As long as you are using the same control power supply for both the answer is yes. Use the same connections on both if that is what you are trying to do.
We just had the whole trane system installed. It is the same specs you are asking about. It also has a new furnace that is high efficiency as well as new thermostat that is digital. We paid $7,800 without the $1500 tax credit. $6,300 total.
What type of system do you have? Heat pump? With or without supplemental electric strip heat? Warm air furnace? Need to know in order to help.
You need a furnace because the heat it generates warms your house. Without it, it would be like camping without a campfire!