TBoyd

I have cleaned everything around and under the equipment, checked all of the wiring and grounding. I have an exploded view of the heater now so I will begin to troubleshoot tonight. I do have a few questions though: How do I get to the flame sensor and hot surface ignitor? I assume that there is a cover to remove to get to them and if so, can I run the equipment with the cover removed?

I have had problems with this heater ever since it was installed. I was told that I had to get a bigger gas regulator so I had the gas company put the largest residential regulator that they had. I had a new line put in to the heater from the regulator. I had the WC checked last year and it was OK. I will check it again tomorrow. I just put new filters in the water filter unit so I know it is getting enough water flow. It cycles three times and then gives me the AGS light. I read the previous posts and some sound just like my problem. Blower starts in low, I get ignition, see glow in the peep hole and the fan goes to high. It heats for a while then starts the cycle again. After three cycles it shuts off and I get the AGS light. What should I do next...I do not know anything about this heater and do not have an exploded view or manual. Thanks.