I have a 20 year old Lennox Pulse. It started to make an odd noise so I removed the panel over top of the induced draft motor while it was running. (I out it back on, tightly, of course) Now the motor growls at freakishly high volume. I had a repair guy in and he thinks its fine.
I just can't believe that it goes from not sounding like a lawn mower to sounding like a lawn mower and there's nothing I can do about it.
If it's a pulse furnace most were built with what's called a flapper valve and it is in need of replacement. If 20 years old it also needs to be checked for heat exchanger damage. This will need to be done by trained HVAC tech. There is no way to see inside exchanger on this system and needs to be done on table testing. This furnace at one time had a problem with heat exchangers and Lennox subcontracted this out to a company that did the liners wrong. Customers had no way of knowing there was a split in the heat exchanger until it was too late. And yes there was a warrning sent out to all people who owned one to have it checked. I CAN'T even remember the last time I saw a pulse furnace after that. I've been in the HVAC field for 30 years now. Hope this helped you.
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There should be a gasket between the mounting flange of the inducer motor and the furnace. If you do not have that you can use a small bead of blue or red silicone caulking to seal it. Hope this helps you. Thanks
you will need to verify voltage from the board to the inducer. If you have the installtion manual there is a flow chart for the sequence of operation of the furnace.
The basic sequence is:
1. thermostat calls for heat
2. inducer motor starts and runs for a pre-set amount of time
3. the pressure switch closes and allows for ignition trial
4. ignition is proved back to the board allowing the system to operate.
Verify 120VAC to the inducer motor upon call for heat from stat, if you have 120 at the leads that connect to the inducer and it does not start , the motor is faulty. If the inducer starts use a voltmeter across the pressure switch terminals, a voltage reading of 0 VAC will verify contact closure and ignition should occur.
The pulse furnace was under a factory recall due to breaches in the heat exchanger, unfortunately for you, the Lennox Corp. has ended the program that allowed for an allowance / furnace for replacement. To test the heat exchanger a special kit is required from lennox that will verify integrity of the heat exchanger. (If the heat exchanger seal has been comrimised the pressure switch will not prove and the igniton sequence will be interupted and cause the system to go into "lock-out" mode).I know this is probably not what you wanted to hear. Hope this helps, please list as "very helpful" if it did
Could be correct, or you may have something in your fan that either fell into or crawled into your fan through the exahust duct.Since you have a service contract, have they actually been out to look at it or did they tell you that on the phone. It might be worth removing the fan and clear any forign matter. The problem is the labor to do that would be the same as to replace it. What does your service contract cover??
I have an Amana High Efficiency furnace that I purchased 5 years ago this past October (2009). My furnace started making a horrible noise last night and then stopped working. The repair person, told me my draft inducer motor needed replaced, and showed me where the plastic fan blade inside of the inducer was "chewed up." Of course my first question is, "How can a 5 year old furnace need such a costly repair already?" The only answer I received is that it will cost me close to $500.00 to have the situation remedied (service call, parts, labor). I started looking around on the internet today, and discovered that high efficiency furnace inducer motors are usually encased in plastic and the motor fan blades are made of plastic rather than metal like the lower efficiency models. Turns out that these plastic blades over time can't withstand the high heat generated and in time (they estimate 3-4 years) break. The damage to the blades causes an imbalance in the way they spin, which in turn, generates the resulting problem of a damaged draft inducer motor. Appears this is a design flaw. Yeah! I'll say. I spent $3100.00 for a brand new furnace and 5 years later I'm paying another $500.00 and apparently can look forward to doing the same in 3-5 more years! Maybe this answers in part your question?
The bearings are bad. You need to replace the motor. Motor cost $75 to $125. Labor is on avg. $150 to $400 with an decent A/C Company . You can try to oil it but its not recommend by Lennox. That furnace at the time they build it was top of the line. Good Luck.