Lennox pulse question

cgreiner

I have a Lennox Pulse that's run pretty good over the years, but it recently stopped running. it would start to fire for 1 or 2 seconds, then the light would flash once on the ignition control module. Wait 15-20 seconds, and repeat.

I though the line from the pressure switch to the PVC pipe might be clogged, so I disconnected it from the PVC (leaving it attached to the pressure switch). Interestingly, I had my thumb over the end of the tubing, and it fired up, and stayed running. The second I took my thumb off the hole, it shut down. it's currently the only way to start and keep the unit running.

It seems to be the opposite of what I'd expect. I'm effectively clogging the line, and it's the only way it will work. Thoughts??

EBEBRATT-Ed

Does the pressure switch have two connections or only 1?? It could be a differential switch.

If your still running a Lennox Pulse you should probably plan for a replacement.

Chances are something is plugged. Check air switch tubing. Condensate drain & Pump. Water or debris in air intake or flue.

Tinman

Lined plenums and return drops, mufflers for the flue and intake, flex gas, flex conduit.

Ah the memories.