topic Re: MF743Cdw Fan Running Continuously in Office Printers

MF743Cdw Fan Running Continuously

binarysamurai — Tue, 09 Jul 2019 18:40:58 GMT

I recently purchased a imageClass 743Cdw and noticed that the fan runs continiously even in sleep mode. similiar to MF733Cdw Fan Running Continuously post. Unfortunately that post ends with no useful information and an EcoStar device should not be really running a fan continously when in sleep mode. How do I get the fan to stop short of turning off the power?

Re: MF743Cdw Fan Running Continuously

binarysamurai — Wed, 10 Jul 2019 17:47:12 GMT

Anybody have any feedback to give?

Re: MF743Cdw Fan Running Continuously

Danny — Wed, 10 Jul 2019 17:53:11 GMT

Hi, binarysamurai!

Thanks for posting on our forum! This community is designed for your fellow Canon owners to help each other out with any problems they may encounter. If this is a time-sensitive matter, click HERE search our knowledge base or find additional support options HERE.

Thanks and have a great day!

Re: MF743Cdw Fan Running Continuously

binarysamurai — Wed, 10 Jul 2019 17:56:47 GMT

Danny,

Thanks but there is no document referencing anything about sleep mode or fans in the knowledge base and the support team couldn't provide any more detail other than update firmware (which I have already done). I can't even get some one to tell me if this is by design (expected behavior) or is an anomaly. So I guess i will just return the device then.

Re: MF743Cdw Fan Running Continuously

HBerkley — Tue, 24 Sep 2019 14:46:09 GMT

I am having the same problem and it appears to be related to the fax function. As I use the fax VERY infrequently I just need to find a way to tell it not to wait to receive faxes all of the time. (At least I think this is the issue since it wasn't doing this until after I turned on the fax function.)

Besides the energy wasting and the noise it just doesn't seem that a machne waiting to be awakened by a phone call should need to run a fan constantly.

Any solution? Thanks.

Re: MF743Cdw Fan Running Continuously

Patrice — Tue, 24 Sep 2019 18:40:03 GMT

Hi HBerkley.

The fax function should not cause the fan to run continuously. There are a couple of other settings that you can check. They are the Auto Adjust Image Setting and High Humidity Mode setting. To disable these settings, please follow the steps below:

Auto Adjust Image Regularly

<Menu> <Adjustment/Maintenance> <Adjust Image Quality> <Auto Correction Settings> <Auto Adjust Image Regularly> Select <Off>

High Humidity Mode

If you continue to experience an issue with the printer, please call us at 1-800-OK-CANON (652-2666), Monday - Friday 10:00 a.m. to 6:30 p.m. ET (excluding holidays).

Re: MF743Cdw Fan Running Continuously

HBerkley — Tue, 24 Sep 2019 19:51:48 GMT

Neither of those settings were on and the problem still exists. Spent time ith support on the phone and they have concluded that there is something wrong with my month old device. Now to get it fixed! (or more likely have them replace the device.)

Re: MF743Cdw Fan Running Continuously

HBerkley — Tue, 24 Sep 2019 20:10:07 GMT

We tried one last effort - resetting the machine to factory settings. While I lost all my settings and will have to put them in again, the fan stopped running. Obviously there is a software bug in there and I am hoping that one of the options I setup previously is not going to cause the fan to run again - but for now it is fixed.

I should also mention that the gentleman on the support line was great.

Re: MF743Cdw Fan Running Continuously

binarysamurai — Wed, 25 Sep 2019 05:43:18 GMT

HBerkley,

You hit the nail on the head! The suggestion to reset to factory defaults is the solution. I performed the same steps as you suggested and then re-setup the device (including manual fax rx) and the printer is on and sleeping without a single whir our fan noise to be found.

Re: MF743Cdw Fan Running Continuously

FrigidLake — Fri, 15 Nov 2019 20:51:09 GMT

I have tried initilazing all settings and setting the fax to manual receive through the setup guide but the fan keeps spinng 24/7. Are there any other settings I could try.

I have a MF743Cdw purchased in June 2019 and upgraded to the latest firmware.

Re: MF743Cdw Fan Running Continuously

binarysamurai — Fri, 15 Nov 2019 22:04:00 GMT

Are you sure you did a full factory reset? Try one more time. Also post your firmware version.

Re: MF743Cdw Fan Running Continuously

FrigidLake — Fri, 15 Nov 2019 22:23:02 GMT

I initialized the settings a second time and did the basic language and time selection. The fan now shuts off while in sleep mode.

Re: MF743Cdw Fan Running Continuously

binarysamurai — Fri, 15 Nov 2019 22:24:24 GMT

Fantastic! **bleep** glad to hear it!

Re: MF743Cdw Fan Running Continuously

canon_mfc_owner — Sat, 11 Sep 2021 19:07:19 GMT

I believe there's definitely a firmware bug here - and it would be great if Canon would investigate/ fix it. It's related to using the fax function. Out of the box, the fan works normally - and stops spinning when the machine goes to sleep. Once the fax function is used, the fan never sleeps. I've reset all the settings and the continuous fan goes away. However, using the fax function again causes the fan to spin forever again and the only way I've been able to stop it is by factory resetting the entire machine again. Obviously, completely factory resetting the machine after every sent fax is not an acceptable workaround. Soon after I got the machine, I called customer service and explained the issue. I don't think they understood and/ or never escalated the problem.

CANON - PLEASE FIX THE FIRMWARE!!!

Re: MF743Cdw Fan Running Continuously

Hector — Wed, 24 Nov 2021 20:31:16 GMT

Hello,

Receiving faxes should not make the fan run all the time. In this situaion, it would look like there is a problem with the hardware. I would suggest contacting our support team at 1-800-652-2666. Our agents would be happy to provide service options for the printer.

Re: MF743Cdw Fan Running Continuously

canon_mfc_owner — Fri, 03 Dec 2021 03:00:56 GMT

Hector - Thanks for the reply. I've had this problem since purchasing the machine several years ago. I actually did call your support team shortly after purchase (I noticed the problem right away) and they were not particularly helpful. I'm pretty confident it's a firmware problem and not a hardware problem - particularly because after factory resetting the machine it works fine, and continues to work fine until using the fax function. I would ask that you have someone at Canon try it out: set up the machine, plug it in to a phone line, send a fax. After that, the fan will not stop spinning, even in sleep mode.