Lennox Pulse furnace

Hey All,

I inspected a Lennox Pule furnace the other day that has a model and serial number as follows:
M/N- 398AAWD3600ACBA
S/N- 0585A35992
This model number does not follow the typical nomenclature for pulse furnaces.

I’m assuming that he manufacture date is either the 5th week or month of 1985.

There were records of regular services over the past few years but there was no pressure test certificate visible on the unit.

I recommended that a HVAC technician pressure test the unit. Was that the right thing to do or are there some Pulse furnaces that are not subject to cracked heat exchangers?

Any input would be appreciated,

Thanks, Chip

05* = Manufacture Plant**
**85 = 1985
******A=January **

I always call for a service and a pressure test on the pulse. There have been to many issues with them. The first to numbers are the plant number and the second two are the year. The “A” represents the month.

Obsolete furnace recommend Budget for immediate replacement .


**YOU **are obsolete, and recommend that no aspiring inspector intending to stay in business, pay any attention to the old fart behind the curtain! He will get you in more trouble than you bargained for.

I believe the ones with issues the model began with G

Yes, and the issue was possible cracked heat exchangers. A “service bulletin” was issued for a free inspection/testing, and if a problem was found, the exchanger was replaced under recall. I believe most problems occurred around the 4-5 year of age mark. The ‘recall’ ended around mid-1990’s, I think.

THERE IS NO REASON to replace these furnaces if in proper working condition and kept in maintenance… no different than any other furnace, of any other age or manufacturer!!!

I fully agree. They do require regular maintenance or they can be problematic. I always recommend a yearly service. Parts for them are getting hard to find as well.

About the only thing that goes wrong with these furnaces are the igniter plug and a vacuum diaphragm. Good furnaces.


The most and least reliable gas furnaces

Some brands are more repair-prone than others

Published: September 2014
**Find Ratings **********
[FONT=“Arial”]Thermostats](http://www.consumerreports.org/cro/appliances/heating-cooling-and-air/thermostats/thermostat-ratings/ratings-overview.htm) [/FONT]
[FONT=“Arial”]Smoke alarms](http://www.consumerreports.org/cro/home-garden/home-improvement/co-and-smoke-alarms/carbon-monoxide-alarm-ratings/ratings-overview.htm) [/FONT]
[FONT=“Arial”]Space heaters](http://www.consumerreports.org/cro/appliances/heating-cooling-and-air/space-heaters/space-heater-ratings/ratings-overview.htm) [/FONT]
Today’s more-efficient gas furnaces can save you up to $40 for every $100 you spend on fuel compared with older models.
That means that even though replacing a furnace can be expensive, your costs will be paid back over time through lower energy bills.
If you’re replacing your gas furnace or buying a new one, you’ll want to check the results of the latest reliability survey by the Consumer Reports National Research Center.
The survey covers 21,132 natural-gas furnaces bought between 2008 and early 2014.
Reliability is especially important because when a furnace failed, 77 percent needed significant work.
A majority of those broke down completely, with nearly a third producing no heat for more than a day. For 40 percent, the repair cost $150 or more.

If a key part such as the heat exchanger or control module fails, you’re better off replacing the furnace if it’s more than 15 years old (furnaces typically last 15 to 18 years).
Otherwise, repairing rather than replacing a furnace might make more sense.
If your furnace is on the fritz, try the following before you call a contractor or start shopping, and see our gas furnace buying guide](http://www.consumerreports.org/cro/gas-furnaces/buying-guide.htm) for more details.

Check the filter. If you’re getting low airflow, check the air filter on the furnace. A clogged filter could cut airflow down to a trickle.
The highly rated 3M Filtrete 1900 MPR](http://www.consumerreports.org/cro/appliances/heating-cooling-and-air/air-purifiers/home-air-purifier-ratings/models/overview/3m-filtrete-1900-mpr-99029948.htm), $20, traps dust better than the usual furnace filter, so it can also help clean the air.
Check it monthly, and replace when dirty.

Inspect electrical parts. Loose wires or a thermostat malfunction could also cause heat problems. If your thermostat runs on batteries, try changing them. And make sure that burned-out fuses or tripped breakers haven’t shut power to the fan or circuit board.
Ensure your safety.** Every home with a gas or oil furnace should have a carbon-monoxide alarm on each floor and near (not inside) an attached garage. One we recommend is the First Alert CO615](http://www.consumerreports.org/cro/home-garden/home-improvement/co-and-smoke-alarms/carbon-monoxide-alarm-ratings/models/overview/first-alert-co615-99023814.htm), $30. Test the alarm weekly, vacuum it monthly, and replace it every five years. Don’t remember how old the alarm is? Look on the back for the manufacture date.
For more information on gas furnaces including features to consider, consult our gas furnace buying guide.](http://www.consumerreports.org/cro/gas-furnaces/buying-guide.htm)
—Mary H.J. Farrell

Once again… MAINTENANCE!

EVERYTHING FAILS if regular maintenance is not performed.

Try NOT maintaining your vehicle and see how far that gets you!

More BS opinion lacking in FACT!

There is one fact I would like to know (were you born a A** hole) or did you just become one over time

How did you become one?

Would you recommend immediate replacement of a functioning appliance based on the information given in the OP?


I like your answers, They are direct and to the point but also exhibit common sense inspecting. Do you have any information on this Pulse furnace model number>M/N- 398AAWD3600ACBA, and why it is so odd compared to others. I have inspected approximately 10 Pulse furnaces in the last year ad none of them have numbers like this one. It appears to be more of a Carrier/ Coleman Number.

I made no reference as to what was said it was the malice of the tone. He has no diplomacy he is a lot like you:( must be the northern climate cabin fever

Roy deserved the tone.

He earned it.

How about your tone?

And there you have it.

One question though as I didn’t bother reading through it all…

Did I miss the part where it said…


I have learned at my age how to tell people to go to hell and enjoy the trip;-)