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-   -   furnace doesn't turn on automatically (http://www.diychatroom.com/f17/furnace-doesnt-turn-automatically-163057/)

akai 11-12-2012 10:42 AM

control board problem? furnace won't turn on
 
what I did so far:
1, new battery to the thermostat;
2, turn the stat to cool, everything works, cool air comes, fan on
3, turn the stat to heat, fan on "on", fan is on, no heating;
4, turn the stat to heat, fan on "auto", noise from the furnace like it's on but no heating, fan is not work neither;
6: turn off the power to furnace, then removed red wire from the stat, jump R to W, turn the power back on
furnace give the on noise, but the heating is not on, the 3 burner were not ignited (same as 4, I guess the stat is good)
5, there's no flashing on the viewing port.


OK, just got myself educated a little bit, I think what happens for my furnace is:
1, call for heater;
2, booster assembly sends air to the burner for combustion;
3, pressure switch on;
4, control board ignite the gas (mine stops here) so no
5, gas melter didn't click, burner not on, and no blower...

is that because of the control board is wrong? what can I do now?

akai 11-12-2012 11:12 AM

And there's no flashing led light through the viewing port.

The brand is Arcoaire, don't know the model, it's around 10 years old

Doc Holliday 11-12-2012 01:12 PM

remove the face plate of the stat exposing the thermostat wires. jump r to w to bring on heat. If heating works then your stat is bad.

Might want to turn the breaker to the furnace off first, either jump the two wires or remove them and twist them together, and then turn the breaker back on. You stand a chance of blowing a fuse or transformer if you arc that R wire to metal.

Doc Holliday 11-12-2012 01:15 PM

You can also jump inside the furnace, same terminal connections on the control board as inside the stat. R to W for heat.

akai 11-12-2012 01:47 PM

Thanks Doc Holliday,

I just did the test:
6: turn off the power to furnace, then removed red wire from the stat, jump R to W, turn the power back on
furnace give the on noise, but the heating is not on, the 3 burner were not ignited

could be problem there?

Doc Holliday 11-12-2012 02:15 PM

No led lights still? Can you try jumping it inside the furnace?

Doc Holliday 11-12-2012 02:22 PM

The inducer motor will close the pressure switch which simply proves that indeed the burnt gas can be exhausted from the system. Without the pressure switch closing there will be no ignition. I'd pull the hose off of the pressure switch and from the other end at the draft inducer motor and clear out both those ports with a straightened paper clip. This is a shot in the dark as you're saying there is no led flashing code.

Those ports tend to become blocked, you need to really shove it into the draft inducer motor and very carefully clear the pressure switch port. You can also simply remove the tube from the draft inducer and while on call for heat suck on that tube, manually closing the pressure switch. If the heater ignites than we know where the problem is.

akai 11-12-2012 03:16 PM

I don't know which one is the pressure switch, is it the one with a transparent tube or the one with the red tube? thanks.

So you are saying 1; remove the switch tube from draft inducer
2, turn the stat on
3, suck on the tube?

akai 11-12-2012 03:45 PM

OK, I know which one is the pressure switch :)


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