They had problems with the weld joints on the secondary heat exchanger. The recall program was for G14's theġst family of pulse furnaces, from 1982-1989.
LENNOX FURNACE PARTS MOTHERBOARD INSTALL
Yes, if you can find a dealer to sell you the part over the counter(good luck) you can install it yourself.
Yes, you can mount it away from the furnace, but there is no kit that I know of to do it. Your control is failing because of vibration, over a period of time the diodes loosen up on the board. There is very little savings overall.ĪS for the recall, it was issued AFTER the recall expiry date, and because the original contractor was not a lennox dealer, they would not honor it !!! Pulse 21, Model 2103060-1 (60,000BTU), high efficiency furnaces, may be cheaper on natural gas and squeeze more heat out of the exhaust, but you spend allot more on hydro, in the end, keeping that 1/2 HP fan motor runing all day. Here in Canada I would have spent 7 grand to do that ! If you have no monoxide in the house, its this air intake filter, if you DO have monoxide, its the combustion chamber or heat exchanger ! Which then means you replace the furnace. My carbon monoxide was not the usual 20 PPM but 7000 PPM, they said I "HAD" to get it done (they needed the money), even though the air intake 'filter' was plugged or they would have my gas turned off, during the winter till i bought a new furnace, they would have been wrong at my expense. It costs from 200 to 300 depending on who does it.
Should it be a concern in which case it makes sense to replace the whole furnace rather than the control or is it a minor situation that is being positioned in a way to sell a new furnace when one is not really needed. In essence I am trying to assess how big a concern, if any, is this heat exchanger situation. My final questions are does this sound plausible and is the price for the new unit reasonable? Also if you were going to replace an 80,000 BTU gas unit and could chose any manufacturer and model what would you recommend and why? It would then cost us about $2,600 for the new unit. The technician recommended that the unit be replaced with a Lennox G51 90,000 BTU unit and that if we went this route the company could likely get us a credit of about $1K from Lennox towards the new installation. The third question is has anyone heard this? The repair technician said that Pulse 21 Furnace has not been "officially recalled" but that there is a Lennox repair bulletin that says the heat exchangers are failing and they should be checked and the unit condemned there is evidence of the failure condition. It appears that these modules seem to burn out relatively quickly because they are mounted on the wall of the heat chamber which over time probably overstresses the componentry and causes the unit to fail so my second question is can the unit be mounted elsewhere as long as it is properly connected and grounded? My first question is that since this control unit appears to be just "plug and play" can I source the part and self-install for less than the $500.00 I was quoted for the repair. The contoller on the unit is made by Johnson Controls.
We recently were having difficulties (every few days would need to reset power for the unit to run) and the controller was diagnosed as needing replacement. The unit we have is an 80,000 BTU Lennox Pulse 21 Model. I will provide some initial background and then include my questions with some additional detail. I have several questions concerning our Lennox Pulse 21 Gas Furnace.