Thor Forums

[16ACE27]

Originally Posted by Vibeman

My Dometic was giving me very similar problems but erratic. Fan on, no spark. Fan on, spark, no flame. Fan on, spark, flame, flame goes out in a few seconds, fan continues to run, then shuts down. Fan, spark, flame, run for 5+ minutes then flame stops, fan continues to run for cool down then stops. All of these symptoms were eliminated when I finally replaced the sail switch. The original switch was clean and tested good on the bench, but apparently was not reliably staying on during an entire cycle. Each time it quit I was getting the “low flow” code on the board. I replaced it with a cheap knock-off purchased at an RV store and have not had a single fault out in many, many cycles since.
On a related note, after replacing the sail switch the flame will still cycle on and off but the fan will run continuously until the thermostat is satisfied. I presume this flame cycling is caused by the high limit switch, but since I already have the recommended number of outlets with the recommended surface area it would require major system modification to increase air flow. Does anyone know if this cycling could be considered normal, or if not, could it be a long term problem?

That cycling is normal in our RV.