Atwood 8535 blowing fuses

Is that the control board fuse on the Atwood or the "furnace" fuse at the DC fuse panel?

Possibly a bad gas valve. 12v turns on the gas valve.

If it does not blow until the burner ignites, it is probably the wires going to the Hi Limit switch. The wires are burner/melted to the burner chamber and when it heats up, it causes the wires to melt slightly and blows the fuse. The wires on this model are extremely close to the burner. Doug

A bit larger fuse ?? Naw, too simple to try that.

BFL13 wrote:
Is that the control board fuse on the Atwood or the "furnace" fuse at the DC fuse panel?

The furnace fuse on the fuse.block

The additional 0.5 amps when the burner is lit, isn't much to blow a fuse unless it is the straw that broke the camel's back. Or that 0.5 goes way higher due to a loose connection or something.

One thing as suggested in another thread, was to disconnect the 12v wire at the furnace that goes to the fuse panel. Now use a portable 12v charger or jumper cables from a battery to power the furnace by itself and see if that still happens.

If not then at the fuse panel, is there anything else sharing that fuse with the furnace that could be adding amps?

With so many replaced parts, that leaves many opportunities for something to be not put back together right.

BFL13 wrote:
The additional 0.5 amps when the burner is lit, isn't much to blow a fuse unless it is the straw that broke the camel's back. Or that 0.5 goes way higher due to a loose connection or something.

One thing as suggested in another thread, was to disconnect the 12v wire at the furnace that goes to the fuse panel. Now use a portable 12v charger or jumper cables from a battery to power the furnace by itself and see if that still happens.

If not then at the fuse panel, is there anything else sharing that fuse with the furnace that could be adding amps?

With so many replaced parts, that leaves many opportunities for something to be not put back together right.

Repeat !!
A bit larger fuse ?? Naw, too simple to try that

Was the white wire going to the high temp limiter, had gotten pinched and was arcing to the grounded chassy

Good follow-up. Doug had it right.

RJsfishin wrote:
A bit larger fuse ?? Naw, too simple to try that.

Always a bad idea.