Stu

Just received an email from Dometic - am guessing I won't hear back w/ an answer though until Monday or Tuesday. The support tech did however describe the problem to a 'T' so am assuming they've seen it prior. Will post their response when I find out. Thanks again everyone for the help!

Wrknrvr - thanks for the info. The board 'looks' good - clean/dry/corrosion free but who knows if any of the components on the board are bad. Kirk - got it - thank you. Was able to click the reset and get it temporarily working but it's intermittent. I may need to limp it through until I can get it to a dealer.

Thank you Randy and Kirk...all good info. Randy, I don't think our unit is making that far into the process where it would call for gas yet. The fan pulses are maybe every second (continuously). I haven't pulled the heater out - have only had the cover off to check wire connections. Kirk, battery voltage is 13.25 so should be good there. The battery fitting on the battery case cover was a little loose to the cables but the cables were tight to each other so don't think the 12v source is an issue. Thanks again for taking the time to respond. I've attached a pic of the unit and the schematic from the book. I don't see a '2nd motor' listed. Any chance their using one motor to drive two (both) fan air circuits? Heater looks fairly simple - not many components. The main unknown is what they're doing on the circuit board.

Thank you for the quick response Kirk! We're plugged into 120vac power - that all seems good. Battery is good per the 'panel' but can throw a multimeter on it to verify. (all other 12v accessories appear to be working properly too). Correct - fan pulsing/cycling is automatic (no inputs from me) about every second or two. Almost seems like the air switch is seeing air flow, the flag/sail switches contact(s), and the fan cuts out until the flag/sail comes back to normal position then repeats? ...though looking at the schematic, it appears only the NO contacts are being used. Can't tell from the print what controls the fan as it's fed by the circuit board.

Hi Everyone. Looking for some help from the community. New to RVing and woke up cold this morning. :( We're FT so difficult to get unit into Service even though it's under warranty. The Dometic DF-series heater running on LP is making a pulsing noise, like the fan is starting then immediately shutting off, then starting... The thermostat is calling for heat. Initially thought we ran out of propane, so switched closed off LP tank valve and opened the other one. Stove/oven work fine.