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Thanks... I was hoping to avoid taking off the flue and the top, but I guess I'm at that point. The tube I replaced with the switch. One thing I wonder though, should I put some sort of lubricant on the tube at the blower nipple? It feels a bit too loose with the new (and old hose). Maybe it...

Hello, I'd appreciate any advice on what to do. My LX400 won't stay lit - I'm starting up the pool for summer - it lights and then after the blower comes on it runs 30 seconds or so and shuts down with an Air Flow Error on the control panel. The blower runs fine, and the air flow switch tube...

Update: I got into the heat exchanger with the help of two burly propane guys...:p It was very sooty. Cleaned it out... And viola! It works! I think it validates the theory that the efficiency was lowered by the lower water throughput, taking a marginally performing heater and making it...

Ahhh yes I remember that now. It is white-ish. Not terribly dirty. I got up on the roof and looked down the flue. It has some soot but nothing terrible. It's what I would expect from a 13 year old flue. I'm going to take the vent pipe put and get on to the heat exchanger today I hope...

I'm not sure what is going on with the burners, I cleaned and replaced a few in the spring, so how could they be so funky already? The heat exchanger may be leaking when it is hot. It doesn't when the heater is cold. I had the burner tray out and watched for leaks thoroughly. I don't know...

Thanks for your reply! Yes - I understand how the fusible link works and what it is supposed to do - I guess I am trying to get out of taking the flue venting down to get into the heater. There are no professionals who come out to this remote corner of the universe, so I'm it. Regarding...

hey.. I have a 7 year old laars lx400 low nox heater that is causing me soooo much trouble! I was hoping for some advice. The heater was working ok, but then started getting AGS errors and blowing the EXTSW1 fusible link sometimes. I noticed some blow back - so I took out the burners and...