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Disconnect wires where they connect to thermostat and twist them together .Lets see if fuse pops again if unit woks.
I am wondering if the short is IN the thermostat.That's why I say connect the wires together leaving thermostat out of the circuit and see if heater will work without popping fuse.
I would get a few.Until we find source of short. Sometimes the only way to locate is by process of eliminating components until it no longer shorts.
If you remove wires from thermostat and touch the wires together, will unit work?
Do you see a wiring diagram on stove you can send me a picture of?
Let me verify something. Do I understand that with no call from thermostat the exhaust blower is coming on?
OK so exhaust blower stops after a few minutes and just sits idle?
I am suspecting board may be the issue.Was looking for a wiring diagram.You can start unplugging components until fuse does not blow, but I think any relay that might short is built into the board.
Unfortunately I do not .Was looking online but haven't found one. That's why I was asking if you had one.
I can open to other experts to see if they have ideas.