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Old 05-03-2019, 01:46 PM   #5
Hurricane34J
Member
 
Brand: Thor Motor Coach
Model: Hurricane 34J
State: Michigan
Posts: 40
THOR #12625
Quote:
Originally Posted by javelin View Post
You did not mention if other coach loads were also being affected by this same control issue? Perhaps a second fan with the same issue?
So either the Firefly system is controlling your fan(s) motor by direct wire connection to the fan (with a small relay either located in the control pad (likely not if low profile).....or located at the fan).......or the control pad is wirelessly controlling the fan(s) which would definitely require a wireless receiver located near the fan to receive the control signals and a mini relay to connect the 12vdc to the fan when required.
If you have a second similar fan in the coach controlled wirelessly (which is working fine) you could try swapping the fan receiver modules (if they are the same module) to see if you just have a sensitive receiver module on the one problem fan.
Failing that approach, you could try to go through your AC system (safely) tightening all ground connections starting with the transfer switch (a good idea to check all connections anyway based on the poor connections discussed on this forum). Since both shore and gen cause enough AC/electrical “noise” to cause this problem the transfer switch and AC breaker panel connections are a good place to start checking for good and tight connections. I would think that the coach batteries would act like big filter capacitors to help filter any AC noise coming through the converter into the DC circuits. The converter would also have its own filter caps of course.....and the fan receiver module would use DC power for its electronics too. I would be surprised if AC power RF (through the air) harmonics are interfering with the fan wireless receiver......but you never know.
Interesting insight.
There are no other devices having the same issue. The other fan in the coach is not controlled oddly by Firefly. It has a traditional toggle switch. I do believe the relay with Firefly is the issue but Firefly thinks it is a coach ground problem and not their system. Firefly has control boards where all devices come into. The G9 board is where the inputs (tank sensors as an example) and outputs (fans, lights etc) terminate.

I agree in batteries. As far as I know, the shore power and generator are just powering the battery charger. So it seems that Firefly would not know or act differently. first I was thinking that it was a amperage problem. The fan was pulling too much amperage and overloading the circuit. However after talking to Firefly and reviewing the g9 board amperage and the amperage requirements of the fan, the Firefly system is providing up to 3 amps and the fan is 1.4 amps. So that doesn't seem like the issue. However I wonder if the software of firefly is less than three amps and the customer service person is not aware of this. Again I think that if I was to put a relay in that wood expose that as to the real issue or perhaps it would still just solve the problem in general. however that still doesn't explain why it only doesn't work on Shore or generator power.
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2019 Thor Motor Coach Hurricane 34J | Front Sumos | Front Koni FSD | CHT Front & Rear | Roadmaster Steering Stabilizer
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