2007-12-19 07:55:29 · 6 answers · asked by blassyg 1 in Home & Garden ➔ Maintenance & Repairs
It all depends on how old the system is, if it has a pilot, hot surface or spark ignition. First thing I would do if I was to go over there is to take the door off the heater, turn the thermostat on and then manually press the door switch to start the heater. If the heater has a induce draft blower it will purge to make sure you have a negative pressure and no carbon monoxide in the combustion chamber, if the negative pressure switch is satisfied, and if you have a hot surface ignitor it will get 110V and light up. After it lights up the gas valve will open and light the heater. If your hot surface ignitor is cracked it wont ever light up. Now if you have a spark ignition instead of a hot surface it will begin to spark and open the gas valve after the negative pressure switch closes. If you turn the thermostat on heat and auto and up high enough to run and the fan comes on immediately, you need to check all the roll out switches, they should have a red reset button on top of them if one of them is tripped you need to call a A/C guy. There are so many things to check I can't write everything down but this should give you some idea how a newer heater works. Hope this helps.
2007-12-19 13:08:01 · answer #1 · answered by markandjess2003 3 · 0⤊ 0⤋
Furnace Blows Cold Air
2016-09-28 04:35:06 · answer #2 · answered by ? 4 · 0⤊ 0⤋
This Site Might Help You.
RE:
My gas heater (furnace) blows out cold air only. what do i do? i use a digital thermostat.?
2015-08-10 15:48:17 · answer #3 · answered by Anonymous · 0⤊ 0⤋
We recently moved into our newly built home and had the same problem with the downstairs furnace. The upstairs one was fine. We called in the installer and it turned out that they had not flipped a switch on it that opened up the heat. Once turned on, we were fine. This may or may not be your problem, but you need someone to come in and look at it unless you know where your switch is.
2007-12-19 08:43:12 · answer #4 · answered by dawnb 7 · 0⤊ 0⤋
It depends on the type of furnace. Check the pilot first if you have one. For a step by step troubleshooting guide check out the furnace page at my source.
2007-12-19 08:02:59 · answer #5 · answered by Anonymous · 0⤊ 0⤋
is the heater getting gas? and is the pilot light working?
2007-12-19 09:53:55 · answer #6 · answered by adam/penny 7 · 0⤊ 0⤋