MaxxFan Model 4751KS Will Not Shut Off

Question

Question:

My vent will open and shut but can’t shut off the fan nor control the speed. It runs on high all the time. I had to pull the fuse to stop it. I disconnected the wires to the fan and the vent will still open and shut from the control panel. I bought a new control panel from you folks and it made no difference.

asked by: Carol A

0

Expert Reply:

I took a look at your order and saw you had purchased the Replacement Key Wall Control part # MA00A03550K but the issue you are having with your MaxxFan Model 4751KS is the circuit board, the Replacement Circuit Board part # MA10A04751KS so this what you need to replace.

expert reply by: Conner L

0

Tank

3/18/2020

We have a wall mount control for our maxair. On the second speed it dims the bathroom light to the point it gets dark in bathroom. The other speeds are fine. The lights are L E D the rv is 2018 Montana.

Chris R.

3/19/2020

That's a new one to me....It certainly sounds like the bathroom light and the fan are sharing the same circuit, and for some reason when the second speed is selected, it's pulling power away from the light, or at least causing the voltage there to drop for some reason. There has to be some kind of wiring issue up there that's causing a type of short. I would inspect both it and the light's wiring to make sure everything is in good condition. You might even have an electrician come and take a look to ensure everything is sound.

Tank

3/19/2020

I couldnt find any loose connection or frayed wires. The fan motor pulls 3.4 amps on startup on all speeds only 2nd speed turns lights off they flicker on other 3 speeds then com on

Chris R.

3/19/2020

This is a pretty strange/unique situation. I honestly think the next step is to try and have a local electrician take a look at everything. I'm really not sure what could be causing just that second speed setting to dim that lights like that. It could be coming from the fan, the bathroom light, or the wiring/power in between.

Tank

3/19/2020

U dont think it could be the switch

Chris R.

3/20/2020

That's a possibility, for sure. Have you checked the wiring behind the switch? There could be a short coming from there - make sure it's securely grounded and that there aren't any loose connections or frayed wiring.

Answer 1

Based on what you mentioned the correct replacement circuit board would be the part #MA10A04751KS.

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Answer 2

Hi Albert, If the vent isn't turning off when pressing the off button on the keypad then then either the keypad #MA94YR or circuit board #MA10A04751KS are malfunctioning and would need to be replaced. I'd start with the keypad first since…

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Answer 3

The Replacement MaxxFan Plus 4-Speed Roof Vent with White Lid #MA00-04751KSX is meant to be a direct replacement however not all the necessary hardware is included. The remaining items you'll need is the Key Wall Control part #MA00A03550K,…

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Answer 4

Based on the issue you are having, Yes. A bad circuit board can cause all kinds of weird issues like your fan running all the time and the vent lid not opening. Since you have the MaxxAir 4751KS you will need the replacement circuit board…

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Answer 5

The correct Replacement Operator Mechanism for your model 4751KS MaxxAir MaxxFan is part #MA10-20281K-1AF. If your fan lid is unable to open even manually, then this is the part you need to replace. The other part you referenced, #MA10A04751KS would…

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Answer 6

The issue you are having with your MaxxAir MaxxFan 4751KS is more than likely an issue with the circuit board (control board). The circuit board is what is telling the motor to run or stop. The correct replacement circuit board for your MaxxAir…

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Answer 7

It sounds to me like your control board on your MaxxAir Fan Model 4751KS. The correct control board replacement for your unit is the Replacement Printed Circuit Board for MaxxAir Manual Lift RV Roof Vents #MA10A21276K.

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Answer 8

Roof vents with fans like the MaxxFan Roof Vent w/ 12V Fan #MA00-04000K do not have a fuse anywhere in the fan itself. You will want to use a circuit tester like #PTW2993 to see if there is power getting to the fan. If it was installed by the…

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Answer 9

If your MaxxAir Fan #MA00-04000K isn't powering on or lifting open then the first step is to check the power. First check the fuse in your power center, it could just be as simple as a blown fuse. From there check the power at the vent using a…

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Answer 10

You will need to test the wiring to determine if the Lift Motor #MA10-20270 is getting power when you press the remote. This will help you determine if the motor is bad or the Printed Circuit Board #MA10A04751KS on your MaxxAir fan. A Test Light…

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Answer 11

Hey James, thanks for all of the info you listed. Based on that the correct replacement circuit board is the part #MA10A04751KS.

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Answer 12

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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MaxxFan Model 4751KS Will Not Shut Off

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