Furnace Maintanence Costs

[superbooos]

Unless there is fire in the furnace, you will always blow cold air when you select fan. When you turn the furnace on, the ignition (pilot or electronic) starts the fire burning, when a certain internal temperature is reached, the fan comes on to blow air through the heat exchanger (where it picks up heat) into the ductwork of the house.
Which part is not working? The furnace does not come on at a pre-selected temperature? It does not come on at all? The thermostat does not control the heat? The switch on the thermostat will not turn on the fan? The switch will not allow the furnace to come on? You have a new thermostat or just put batteries in the old one? Did you wire the thermostats properly?

the furnace doesn't come on at all unless we switch the thermostat to fan instead of auto. we do have a new thermostat but it's been working fine for two months and we also tried replacing the batteries. i think he did wire it correctly because it worked yesterday in the morning and then when we went out and came home, it was off.

so my husband thought it was the new thermostat that died (it's one of the Noma ones 5+2 from CT) so he went and bought another one and still nothing. Then he even tried installing our old nonprogrammable thermostat back and it still isn't turning on at all unless you turn the fan on and then it only blows cold air even when we turned the temperature to 24 to test it out for a few minutes.

my husband said he might just call someone to come out and take a look, he checked homestars.com and found airworks inc. and button's heating.

[Pete_Coach]

the furnace doesn't come on at all unless we switch the thermostat to fan instead of auto. we do have a new thermostat but it's been working fine for two months and we also tried replacing the batteries. i think he did wire it correctly because it worked yesterday in the morning and then when we went out and came home, it was off.

so my husband thought it was the new thermostat that died (it's one of the Noma ones 5+2 from CT) so he went and bought another one and still nothing. Then he even tried installing our old nonprogrammable thermostat back and it still isn't turning on at all unless you turn the fan on and then it only blows cold air even when we turned the temperature to 24 to test it out for a few minutes.

my husband said he might just call someone to come out and take a look, he checked homestars.com and found airworks inc. and button's heating.

My immediate thoughts would be that you have not wired it correctly. The fan circuit is separate and should activate the fan only. You may have wires crossed. This can easily be done especially if there are lots of wires (controls with air conditioner). Do a recheck of the wires and if the problem is not corrected, then you are very correct to call in the experts.

[canadiantofu]

Not sure how much of a DIY person you are.......only try this if you are comfortable working around electricity


If you cross the two wires coming out from the wall. (Should be red and white in color) ... The burners should come on with in a minute... if not, call a professional because the problem is with the furnace.

BTW.. The 2 wires carries 24Volt ac…So, be careful.