First Lenox Pulse 21 Gas Furnace

[Becool]

I just got back from a service call on a Lenox Pulse 21 Gas Furnace (Model G 21Q4/5-10 0-1) This is the first one I have ever seen. Of course, there are not papers for the unit..rental property. I noticed the control module was flashing green so I reset the power and the led changed to solid green. It failed to light and flased again. I checked the inducer (runs) and the pressure switch is closing. I haven't checkd the sparker (looks like a spark plug) or power to the gas valve. I will return in the morning hopefully with a little more information about this unit. I did not see anything about the led code.. steady flashing means??? (probably ignition failure).. any suggestion would be apprciated.. thanks

[ascj]

Did it even cough, when you reset it? Most common issue with furnace is air flapper material. But there are many other things you need to check.

G21 service-
Pulse 21.pdf

[Core_d]

the pressure switch on a lenox pulse is normally closed and then it proves opened. silly i know

[Core_d]

also fyi gass pressure for a pulse is 2'' W.C

[lolson]

Haven't seen one of those for a while, still have the flappers though

[Becool]

It did not do anything. No cough... However, I don't hear as well as I use to.. All I could hear was the module clicking..

[ascj]

the pressure switch on a lenox pulse is normally closed and then it proves opened. silly i know

You sure about that?

[Becool]

What about the flapper material... and the led flashing code?

[ascj]

also fyi gass pressure for a pulse is 2'' W.C

For some....not all.

[ascj]

What about the flapper material... and the led flashing code?

Your LED flashing just tells you it didn't fire and it's locked out. The flapper material is apart of servicing.

Please, read the service manual I provided!

[Core_d]

yea im sure about the pressure switch looking at a schematic now to verify this i have checked this befor they r N.C

[Core_d]

also reading hear low voltage pin terminals are 24 VAC half rectified DC pulse current and your meter may read higher or lower than depending on the meter instead use troubleshooting guide.

[Joehvac25]

Do them a favor and get it pressure tested, just condemned one Friday.