Furnace not igniting (Comfortmaker RPJ II - electronic igniter)

You need a new thermostat. You just got a bad one.
Bubba

If it's electronic ignitor(Piezo electric) You can hear it when it's
activated. Zap, zap, click, click kinda sound. If you don't hear it
then ignitor module could e bad. There are many things which can
malfunction. What is trouble code?

Piezo electric ignition in a gas furnace???? Did you know you  have to push
the button every time it calls for heat? I found some replacements for you.
http://web.ivenue.com/allparts/productCat77269.ctlg  

The model # of the furnace is GNJ050N12D1.
I don't hear the zap, click sound which used to come before the sound
of flames.
A previous post mentioned a trouble code? Where can I check that?
I don't think it's the thermostat. I replaced my old one thinking that
was the problem. But with the new thermostat the exact same thing
happens: the furnace and fan come on, but the furnace doesn't ignite.

Did you polarize the thermostat when you installed it?  Comfortmaker needs
the thermostat polarized and sync'ed with the controller board before it
will work correctly.

Thanks for the reply. Can you tell me how to polarize and sync the
thermostat or is special equipment required?

He is trolling. Trouble code is blinking LED thru small glass window.
Count the blinks to come up with a code. Like ... . will be 31.
Either you have a manual or a sheet with list of code is on the cover
panel usually.

I didn't see any LED signals. There isn't a list of codes anywhere on
the furnace either.
After more trouble shooting I'm thinking it's the igniter. Usually the
first thing you hear is the click-zap sound of the electric igniter.
That no longer happens. Can a non-professional like me replace this
part or try to service it?

    NO.

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If you can see if the module is getting power when it needs to activate.
If it gets proper power and nothing happens(no sparksO, then module is a
suspect.
Problem is the module like that is often non-returnable once you buy it.
So unless absolutely sure, it's a gamble. But it's known to fail.

It could be main control logic board as well.(the part which controls
the ignitor-probably a relay(mechanical or solid state)

It could also be one of the many safeties that is keeping the furnace from
firing.
Sure you don't want to call a tech and get it properly checked and
serviced??

As Steve reminds you, there are many reasons why a furnace would fail
to fire. If you just go replacing parts, it could easily cost more
than having the repair guy out.

You tried thermostat, and that didn't help. The next part(s) you
replace may be both expensive and unnecessary. At this point in time,
best to call the repairman. Before the weather gets colder, and the
rate schedule goes from "fall" to "winter".

--

Christopher A. Young
  You can't shout down a troll.
  You have to starve them.
.



It could also be one of the many safeties that is keeping the furnace
from
firing.
Sure you don't want to call a tech and get it properly checked and
serviced??

It could be caused by Jupiter not being properly aligned with mars. I
think that the real problem though is that the thermostat has somehow
detected daylight savings time early and has gotten its time stamp
sequence out of whack.

 posted for all of us...


OH NOOOOOOOO    will this create a black hole or cause a KABOOM?
--
Tekkie  Don't bother to thank me, I do this as a public service.

Tony Hwang posted for all of us...


It could be a lot of things couldn't it Tony?  Except you don't have a clue!
--
Tekkie  Don't bother to thank me, I do this as a public service.

Tony Hwang posted for all of us...


And Tony how does he see that?  Flux capacitor?
--
Tekkie  Don't bother to thank me, I do this as a public service.

Tony might be guessing since he seems to be mentioning every part on
your furnace.
Do what Oscar says and try polarizing your thermostat. Get a small
jumper wire and with power applied to your furnace, briefly jumper the
R & C terminals together at the furnace 7 times.
Bubba

Wrong, wrong, wrong, you have to jump C to R or the daylight savings
time time stamp sequence feature will go all haywire.