MaxxFan 4751ks Will Start For A Few Seconds Then Fan Stops And Lid Closes

Question

Question:

We have the MaxxFan 4751ks in our RV bathroom, which has the wall control panel. When the fan lift switch is pressed, the fan lid will go up. When a fan speed switch is pressed, the lid will go up, the fan will start for about 2-3 seconds, then stop and the lid lowers. I searched online and also talked to a tech at AirExcel, who said it was the circuit board. I ordered a new one whole new and expensive story and after install of the new board, the fan is acting exactly the same way....it didnt solve anything and Im out $150! Im not sure where to go next....any suggestions? Thanks in advance for any assistance.

asked by: Glen

0

Expert Reply:

Hello Glen, thanks for reaching out. If the circuit board did not fix the issue, it could be the rain sensor that is causing the problem. Something triggering the sensor will cause the lid to close so that would explain it. The best way to test this is to simply disconnect the rain sensor and see if the vent starts to work normally. If disconnecting the rain sensor allows things to work, you will need to replace it with part # MA34FR.

expert reply by: Jesse M

0

Glen

8/13/2024

Thanks Jesse, for the note. Just so you are aware, there is no rain sensor on this 4751KS. I have checked and activated the operator and it seems fine (can be rotated without slipping. That only leaves the lid opening motor as a suspect. Cheers Glen

Jesse M.

8/13/2024

@Glen Oh ok well we can rule out the rain sensor then! The motor is really the only other functional component of the vent that could potentially cause the issue you are describing. it is not unheard of for the motors to go bad. Usually when the motor goes, the lid will not open or close at all. You could try disconnecting the mechanical links from the motor and see if it turns normally. The new motor is part # MA10-20270. The operator mechanism is part # MA10-20281K-1AF but you should be able to tell if the operator mechanism works normally or if the motor itself is the issue.

Glen

8/13/2024

@JesseM thank you for the quick response. There is only so many moving parts in this unit, so I'll try a new motor, as you suggest. It's getting to the point where it's almost cheaper to buy a whole new fan unit, rather than replace parts but I'll give it one more try. thanks again. Glen

Jesse M.

8/13/2024

@Glen I hear you there, Glen. Some of these parts are not cheap. At this point the motor is really the only part left that could be the culprit. Have you already verified that the vent is getting its full 12V power? That is something worth checking if you haven't already. Do let me know how it goes!

Answer 1

Hey Tom, I would check to make sure the power circuits to both fans are solid but otherwise it does sound like the circuit boards are out on both. If you can get me the model number of the fan I can let you know which circuit board you would need.…

view full answer...

Answer 2

You reported that you cannot use the remote on your MaxxFan 4700K to put the vent cover up and down. Let's troubleshoot. Put some new batteries in your remote. Ensure that the display comes on. Verify if your vent cover now works. Verify if other…

view full answer...

Answer 3

Before you start taking anything apart you'll want to test the power and ground connections to ensure that the vent #MA00-7500K has what it needs to properly operate. If your vent has a bad ground it can cause it to act strangely and if it's…

view full answer...

Answer 4

Hey Alan, The correct replacement circuit board for your MaxxAir Fan 10B21275N is going to be the replacement board #MA10A21275K. This will be a direct replacement for you and get your fan back up and running.

view full answer...

Answer 5

For your MaxxFan Deluxe Roof Vent w/ 12V Fan, Thermostat, and Remote - Powered Lift - 10 Speed - Smoke #MA00-07500K the remote screen can work and even other functions and yet not the fan could still be a remote issue. Here are things to test: Does…

view full answer...

Answer 6

The two most likely causes of a MaxxAir vent fan lid not opening or closing are either going to be a lift motor or operator failure. I recommend removing the motor and applying power directly to this to see if the shaft turns. If not, you know the…

view full answer...

Answer 7

I've attached the owners manual for your 4900K model which is similar to the #MA00-04500K model. It sounds like your operator mechanism is bad according to my tech contact at MaxxAir. For your 4900K model you will want the Replacement Operator…

view full answer...

Answer 8

Hello Randy, thanks for reaching out. I agree that replacing the circuit board and rain sensor will resolve the issue. We do have the circuit board you are looking for available as part #MA39FR. The rain sensor is part #MA34FR. A lot of times when we…

view full answer...

Answer 9

This sounds like a problem with the circuit board more than a rain sensor. I recommend, if you have not already, removing the vent from all power for 1-15 minutes. Let it have a hard reset, use this time to give it a good cleaning if needed. Wipe off…

view full answer...

Answer 10

Thank you for the picture! The correct replacement circuit board is the Replacement Printed Circuit Board and Switch for MaxxFan Roof Vents #MA10-04301k-v16.

view full answer...

Answer 11

If the electrical lift on your MaxxFan 4751KS it's likely that the lift operator mechanism has gone bad, so you can use the Replacement Operator Mechanism #MA10-20281K-1AF and that should get you back up and running assuming everything else is in…

view full answer...

Answer 12

After replacing The Printed Circuit Board for MaxxAir MaxxFan Plus Roof Vents #MA10A04751KS, and the motor still does not open the lid you will need to replace the motor. The Replacement 12-Volt Variable Speed Fan Motor for MaxxAir MaxxFan RV Roof…

view full answer...

MaxxFan 4751ks Will Start For A Few Seconds Then Fan Stops And Lid Closes

Products Featured in This Question

Product Page this Question was Asked From

Continue Researching