Atwood Hydro Flame 8500-IV Furance speed fluculates

[CaiqueLady]

I own a 2004 Southwind Fleetwood mh. It has the Atwood Hydro Flame 8500-IV Furnace installed. During our last trip, the blower started to fluculate. We have tried these methods. We have run the furnace with generator or shore line and that is when the problem exists. Straight 12 volt works ok.

The batteries (house and aux) are brand new. When we tested the furnace by running it only on the batteries, it ran fine. It was only when we had it on the generator or shore power that the problem exists.

Any ideas?? Thanks in advance.

[Gary RVRoamer]

That has to be a voltage fluctuation problem. Maybe your converter/charger is switching on/off, shifting your power back and forth between battery (around 12,6v) and converter power (usually around 13,6v). That's enough to change the fan speed.

The converter might switch off if it is overheating from inadequate airflow (it has it s own fan). Or maybe its just crapping out.