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Old 02-21-2018, 12:41 PM   #1
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Maxxfan Problems

Had our original Maxxfan die on us after just a few months. Reace suggested it might be a bad control board. I contacted the company and they sent me a new board. When I spoke with their technician he said the allowable voltage range is 10.6 to 13.7 VDC if I remember correctly and that if you are outside this range the board will be damaged. At that time I checked the voltage and it was 13.2 VDC so I thought I was ok. A little worried but ok. I installed the new board and the fan seemed to operate normally. This morning I tried to turn it on again and got no response either from the remote or the local buttons. I noticed we were now at 13.9 VDC. I assume the new board is now dead. We are connected to campground power. It is at 123 VAC and the surge protector shows no errors.

So how do I fix this so we don't fry another control board? When connected to shore power is the converter supplying DC power? If so, can it be adjusted to lower the voltage? Do I need to install a resistor to drop the voltage at the fan?
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Old 02-21-2018, 01:46 PM   #2
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The upper limit of the operating range is surprising because chargers (both solar charge controllers and AC-powered converter/chargers) routinely exceed 13.7 volts at the highest voltage point of the charging cycle. Automotive charging systems (such as from the tug) routinely run at over 14 volts.

Just a resistor might not be effective, but a voltage regulator could be added. It shouldn't be needed, since essentially every MaxxFan in existence is used with an RV electrical system, and it is routine for those to exceed 13.7 volts - there is nothing unique about an Escape in this regard.
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Old 02-21-2018, 02:08 PM   #3
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The upper limit of the operating range is surprising because chargers (both solar charge controllers and AC-powered converter/chargers) routinely exceed 13.7 volts at the highest voltage point of the charging cycle. Automotive charging systems (such as from the tug) routinely run at over 14 volts.

Just a resistor might not be effective, but a voltage regulator could be added. It shouldn't be needed, since essentially every MaxxFan in existence is used with an RV electrical system, and it is routine for those to exceed 13.7 volts - there is nothing unique about an Escape in this regard.
I just spoke with the MaxxFan people again and they said they don't like seeing anything above 13.5 VDC so I'm stumped why it works ok with other people but fries my board.
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Old 02-21-2018, 02:21 PM   #4
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Originally Posted by stephen99 View Post
So how do I fix this so we don't fry another control board? When connected to shore power is the converter supplying DC power? If so, can it be adjusted to lower the voltage? Do I need to install a resistor to drop the voltage at the fan?
You might want to regulate the 12v going to the Maxxfan. The Maxxfan on startup could pull up to 10 amps so the regulator would have to be robust enough to handle it. This could help:
https://www.amazon.com/voltage-regul...ulator+12V+10a
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Old 02-21-2018, 02:33 PM   #5
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You might want to regulate the 12v going to the Maxxfan. The Maxxfan on startup could pull up to 10 amps so the regulator would have to be robust enough to handle it. This could help:
https://www.amazon.com/SMAKN%C2%AE-C...12V+to+12v+10a
Thanks for that. I might have to give that a try.
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Old 02-21-2018, 02:36 PM   #6
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Thanks for that. I might have to give that a try.
I pasted the wrong URL - this is the correct one. (I was in edit when you quoted it) There are other voltage regulators out there that might be better/cheaper but it should give you an idea.

https://www.amazon.com/voltage-regul...ulator+12V+10a
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Old 02-21-2018, 03:06 PM   #7
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Could your problem be low voltage getting to the fan instead of >13.7 volts?
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Old 02-21-2018, 03:33 PM   #8
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Could your problem be low voltage getting to the fan instead of >13.7 volts?
Don't know. Every time I check the voltage at the fan it's the same as the voltage readout on the Victron.
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Old 02-21-2018, 06:25 PM   #9
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What could they possibly be thinking - an RV specific fan that will not tolerate standard charging voltages?!?! This means that the fan should not be used while plugged in to either the tug with the engine running, or to shore power, which is nonsense to put it politely.

Yet another modification that should not be necessary. Good thing we got an earlier delivery date, the initial setup project keeps getting longer.

Has anyone figured out where a voltage regulator could be placed to feed the maxxfan in the 21?
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Old 02-21-2018, 06:46 PM   #10
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Originally Posted by AllanEdie View Post
What could they possibly be thinking - an RV specific fan that will not tolerate standard charging voltages?!?! This means that the fan should not be used while plugged in to either the tug with the engine running, or to shore power, which is nonsense to put it politely.

Yet another modification that should not be necessary. Good thing we got an earlier delivery date, the initial setup project keeps getting longer.

Has anyone figured out where a voltage regulator could be placed to feed the maxxfan in the 21?
Im not an electrician, Allen, but I am expecting/hoping there is another reason for the blown circuit board. Hundreds of us have been using the Maxxfan for many years, under all circumstances, and have not experienced this problem. Hopefully, the problem is resolved quickly and permanently.
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