Lenovo t42p fan error

lenovo t42p fan error

sprers.eu › ibm-thinkpad-laptop-displays-fan-error-messa. How to Replace Lenovo IBM Thinkpad T41 T41P T42 T42P CPU Cooling Fan. Disassembly Manual, removal guide. ThinkPad T40/T40p, T41/T41p, T42/T42p Series Fan assembly. Fan. Thermal sensing error. System board. Authentication of system services failed.

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Lenovo t42p fan error
Cannot start driver error 1275
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lenovo t42p fan error

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How to control fan speed

This page discusses methods for controlling the system fan.

For Linux


Fan control operations are disabled by default for safety reasons.

To enable fan control, the module parameter must be given to thinkpad-acpi.

For example, in Ubuntu (Hardy Heron), add the following to :

For Debian Squeeze (testing) create with: and install the package

Having done so, reboot and you can use the following commands to control fan speed:

(fan off)

(low speed)

(medium speed)

(maximum speed)

(automatic - default)


If you receive a PERMISSION DENIED error you can use the following command syntax instead as a work-around:

(fan off)

(low speed)

(medium speed)

(maximum speed)

(automatic - default)


Automated control scripts

An ACPI fan control script can be used to override the firmware's fan algorithm with gentler, quieter version. It monitors the laptop's thermal sensors and sets the fan speed accordingly, according to customizable thresholds. For the default behavior, simply save (download) as , make sure you've loaded thinkpad-acpi with the "fan_control=1" parameter, and run:

There is an distro independent daemon (sprers.eu+download/sprers.eu), written in python. Packages are available for debian based linux systems.

A GTK GUI program (packaged for Ubuntu and ) may also help.

Automated program - Simple ThinkPad Fan Control

GitHub Page

This is program for controlling fans speed on IBM/Lenovo ThinkPads. It is written for Linux only. This program is written in C, using GTK GUI.

You are required to have the Linux kernel with 'thinkpad-acpi' patch. You must also enable manual control for your fans. For Linux and above, you must add 'fan_control=1' as a module parameter to 'thinkpad-acpi'. For example, in Debian Lenny (and Ubuntu ), you must add the following to "/etc/modprobe.d/options":

options thinkpad_acpi fan_control=1

Having done so, reboot. Now you'll be able to use this program easily.

Here is screenshot:


and direct download (src + i 32bit binary). Please read sprers.eu file included in package.

Download links

GitHub Page

Direct download:


I wrote this for my own personal use, and thought that it would be a good idea to release it to the world, and hope that it will be useful to someone! Feel free to send comments, bug reports or a thanks to the e-mail above. Although I don't use ThinkPad anymore (so I can't test the program), I still try to respond to all emails I get.

Ansible ThinkPad Fan Control


Only tested with Fedora 28 + Lenovo ThinkPad W, model 20BHA02CCL

Ansible will ask the level that you expect that fan, and defaults to full-speed, in order to be use it when things goes hot:

GitHub Page

For Windows

Shimodax's ThinkPad fan control tool offers similar functionality (see forum discussion at sprers.eu). Source and binaries are available through the "Tp4xFanControl" project on SourceForge.

IbmPad's IBM_ECW fan control program can also be used, but it is more flexible in terms of compatibility. This program can be downloaded at IbmPad's website. For additional help or support, please post in this forum topic.

Hardware specs

The following hardware behavior was discovered experimentally by Thinker and neither provided by nor confirmed by IBM/Lenovo. The following description may be inaccurate and may vary by model (see list of models above). The terminology probably does not match the one used by IBM/Lenovo engineers.


The ThinkPad X61s and X61 with WWAN have a second system fan. It shares the same control register as the main fan (cannot be controlled separately), and exposes a second tachometer.

ACPI DSDT register HFSP (8 bits, offset 0x2F in the address space, accessed through the standard EC interface at IO ports 0x62 and 0x66) is read/writable and has the following meaning:

Bits 7 6 5 4 3 2 1 0 Value 1 0 * * * * * * - automatic * 1 * * * * * * - disengaged 0 0 N N N N N N - manual (; 0=disable fan, 1=min, , 7=max)

Changing modes may not be immediate on all ThinkPads. Later ThinkPad models seem to take at least 5s to start responding to a fan mode change, for example.

After boot, the HFSP register may not reflect the true state of the EC (on some models it reads 0x07 even though the EC is actually in automatic mode).

The HFSP register controls both fans at the same time in the X61/X61s.

Fan Tachometer

The embedded controller registers 0x84 (LSB), 0x85 (MSB) are the main fan tachometer, and report fan speed in RPM in everything since the A31 and maybe a little earlier. Not much is know about the tachometer in earlier models, or even whether they had one or not.

On the X61/X61s, one must select through EC register 0x31 bit 0 which fan the tachometer registers will expose (Firmware 7M). Beware: this is the same register used for brightness control in other models.

If the speed reported is , then is typically due to a broken fan assembly. The fan might still be rotating. This error can be intermittent and can prevent booting (Error 'Fan error')

Automatic mode

In automatic mode, the embedded controller sets the fan speed automatically according to system temperatures and some unknown algorithm.

Note that the ACPI DSDT may supplement this in some models. The X40, for example, changes the profile of speeds the automatic mode should use depending on battery status.

Manual mode

In manual mode, the fan level is forced to the given value and the EC will auto-regulate the fan to maintain at a (roughly) constant RPM, which is model-dependent. Manual speed levels yield the same behavior as level 7, and the the ACPI DSDT uses level 7 for the emergency mode it enters upon critical CPU/GPU temperature, so apparently 7 is the real maximum level.

Disengaged (full-speed) mode

In disengaged mode, the embedded controller does not monitor the fan speed. It "disengages" the closed-loop control function that keeps track of fan speed, and uses an open-loop control function that ramps up the fan to its maximum speed (% duty-cycle). The end speed is not stable, but it is often much faster than the maximum speed manual and automatic modes would set the fan to.

Most newer ThinkPads take quite a while (in excess of one minute) to fully enter disengaged mode. Exiting it is much faster. The A31 acts differently, and switches to disengaged mode as fast as it switches to other modes.

For some reason, the embedded controller may stop updating the tachometer registers while entering or exiting disengaged mode in some ThinkPad firmware versions (hence the EC tachometer registers will not be updated on these models while entering/exiting disengaged mode). Once it arrives at maximum speed, or once it gets back at closed-loop cruise speed, the embedded controller starts updating the tachometer registers again. Later T models such as the T43 have this problem, while the A31 does not.


Apparently the pulsing fan noise experienced by some users can be cured by repeatedly running seconds of manual control followed by seconds of disengaged mode. The pulse occurs when the the embedded controller computes the fan speed and adjusts the fan voltage adaptively every few seconds (~sec for the ThinkPad T43); the aforementioned mode switching doesn't give it a chance to do so. Some of the ACPI fan control scripts implements this solution.


To force engaged mode using TPFanControl for Windows, enter '64' as the value () for manual mode. This can also be incorporated into smart mode through a custom sprers.eu

Supported models

The above was successfully tested on the following models:

  • A31, A31p (fan levels RPM: 0 = off, = ~ (!), = ~, = ~, "disengaged" = ~ (see NOTE above))
  • R50 (highest manual level is 3; disengage mode works and reaches much higher RPM)
  • R50p (fan levels RPM: 0 = off, = ~, = ~, = ~, disengaged = ~)
  • R51 (fan levels RPM: 0 = off, = ~, = ~, 6 = ~, disengaged = ~)
  • R51e (fan levels RPM: 0 = off, = ~, = ~, 6 = ~, disengaged = ~)
  • R52 (fan levels RPM: 0 = off, = ~, = ~, 6 = ~, disengaged = ~)
  • R60 (fan levels RPM: 0 = off, = ~, = ~, = ~, disengaged = ~)
  • R60e
  • R61i (fan levels RPM: 0 = off, 1 = , 2 = , 3 = , 4 = , 5 = , 6 = , 7 = , full-speed/disengaged = ~)mod.#[email protected]+/sprers.eu
  • T22
  • T23
    • (low speed = ~, medium and maximum speed = ~; disengaged mode works at ~)
    • (fan levels = ~RPM: 0 = 0; 1,2 = ~; 3,4,5,6,7 = ~; disengaged,full-speed = ~)
  • T30
  • T40 (fan levels RPM: = ~, = ~, = ~; disengaged = ~)
  • T (fan levels RPM: 1 = ~, 2 = ~, = ~, = ~; disengaged mode works at ~)
  • T41, T41p (fan levels RPM: = ~, = ~, = ~; disengaged mode works at ~)
  • Ti (fan levels RPM: 0 = off, 1 = ~, 2 = ~, = ~, = ~, 7 = ~; full-speed/disengaged = ~; only Linux-tested with tpfc)
  • T42, T42p (fan levels RPM: = ~, = ~, = ~; disengaged mode works at ~)
  • T43, T43p (fan levels RPM: = ~, = ~, = ~; disengaged mode works at ~)
  • T60 (fan levels RPM: = , = ~, = ~; disengaged mode works at ~)
  • T61 (fan levels RPM: 0 = off, = ~, = ~, = ~; disengaged mode works at ~)
  • W (fan levels RPM: 0=off, = , = ~, = ~; disengaged mode works at ~)
  • W (fan levels RPM: 0=off, 1 = ~, 2 = ~, = ~, = ~; disengaged mode works at ~)
  • X30 (level 0 = off, low = ~, medium = ~, maximum = ~, disengaged = ~)
  • X31 (fan levels RPM: 0 = off, = ~, = ~, 6 = ~, 7 = ~; disengaged mode works at ~)
  • X40
  • X41
  • X41 Tablet
  • X60 (fan levels RPM: 0 = 0, = ~, = ~, 6 = ~, 7 = ~, disengaged = ~)
  • X61 (fan levels RPM: = ~, = ~, = ~, disengaged = ~)
  • X61s (fan levels RPM: 0 = off, = ~, = ~, = ~, disengaged = ~) (though fancontrol can keep it at rpm)
  • Xe
  • Xi (fan levels RPM: 0 = off, 1 = ~, 4 = ~, 7 = ~, disengaged = ~)
  • X (fan levels RPM: 0 = off, 1 = ~, 2 = ~, = ~, = ~, 7 = ~, full-speed = ~, disengaged = ~)
  • Z60t, Z60m (fan levels RPM: = ~, = ~, = ~)
  • Z61m
  • Z61p (fan levels , auto, disengaged; enable, disable; watchdog (untested))
  • Template:Edge11 (fan levels: 0 = off, 1, 2, 3, 7 = full; RPM shown value is around - , but should be - )

Probably other models are supported too (please update this page if you confirm this; maintain some ordering too).

Supported models using a different interface

The following models also work, which uses a different access method that is supported (only) via the of thinkpad-acpi. There is no need for patching.

  • , X, Z
  • , E
  • , E, X
  • , E, ED, X, Z

Unsupported models

  • , E, X (these models use a different method and register to regulate fan speed)
  • , X (these models don't have a fan)
  • , , , , , , , (these models use a different method and register to regulate fan speed)
  • SL, SL, SLc, SL, SLc (these models use a different method and register to regulate fan speed)
  • R30, R31, R32, R40, R40e (these models use a different method and register to regulate fan speed)

ThinkPad T40 (AU1) "Fan Error" -Need to update BIOS but unsure how?

I'm also trying to order the correct fan part, for the ThinkPad T40 AU1, so that I can be ahead of the game when I bring the laptop in to be serviced at the nearest computer repair shop I can find, but I can't find the exact fan model number, (and when attempting to open the laptop myself I found out that I'm unable to because the screws are so tight that the screwdriver just chips metal off the screws themselves and because some screws are * shaped instead of + shaped, which I lack the proper screwdrivers for, so this looks like a repair shop job) so I'm wondering what the exact model of the fan/heat sink is for the ThinkPad T40 AU1 so that I can order it at the cheapest place online (usually ebay)? Thanks

Edit: Oh I didn't see your above reply until after I made this post. I'll see if I can unscrew the keyboard alone (assumedly from the top, but I'll find out soon enough). Thanks
Edit2: Unfortunately the screws are still physically too tight for me to handle, but if I can get the exact fan model so I don't order something wrong I can ensure that I have the proper part when I take it in to be serviced. Otherwise I'll just take it in and have them order the part if need be--I just think ordering it myself allows me to hunt for the best bargain since that's easy enough that I'm experienced at it.

Edited by andrewset, 03 July - PM.

Hope this guide can help you in the event of a fan failure on your IBM computer.

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    A fan is truly an essential component of any PC or desktop computer. A flaw in the Thinkpad Admirer indicates that the fan is not working hard enough to keep the accessories cool. This puts the computer at risk and causes the robot to fail or crash.

    How do I fix the fan error on my IBM Thinkpad?

    If the fan error does not appear, you need to turn off the laptop and then turn it back on. Unplug the cause from the mains and remove the battery from the laptop. Press and hold the Intensity button for 30 seconds, replace the battery, reconnect the AC adapter and turn it on.

    If you have just completed the upgrade to Windows 10 and an error occurs, enter BIOS (F1 large after power on) and reset the settings to defaults. Make sure the optimized operating system settings are set to Disabled by default, but the system is using UEFI-based secure boot for you. If in doubt, try both types of defaults.

    How do I know if my CPU fan is bad?

    The quickest way to share when your computer fan has stopped working is to visually inspect it. If it’s a desktop computer, you can usually see the fan spinning on the back of the example. If the fan does not work properly, replace it immediately if you continue to use the computer.

    I inserted this error which was occurring right after completing a Windows 7 update that Windows 10 can do. It happened after the entire update and all install messages were complete. Satisfied updateThen I turned off my B laptop and took a nap. I came back from a nap and turned it on for a normal work day, only until there were two beeps and some fan error messages.

    The fan is working properly and at first glance there was no problem with the hardware of the fan itself. The laptop didn’t move the dog’s hair from where it was, I doubted the fan pin connection was loose. I tried to make a hole in the air. Dust came out, but it didn’t help.

    How do I fix my computer fan error?

    Move your sprers.eu sprers.eu your computer at a sprers.eu the processor sprers.eu your processor sprers.eu the location of the fanra sprers.eu using a different socket for the CPU head sprers.eu the CPU fan areas in the BIOS.

    This allowed the BIOS to be reset to default settings. This is where you have to be careful NOT to choose an optimized standard for the operating system (unless you actually use UEFI Secure Boot). I recognize other types of i OS and Applied i OS much better than Standard. Overall, however, not very dangerous, the computer only showed the boot gallery and the hard drive was not working. After following a few simple diagnostic snacks I found in this menu, I went back to BIOS and reset to defaults, but this time the optimized OS will NOT crash. Multiple restartsuskov, and we are resuming our activities.

    So, if you are on the list because you just updated Windows 10 and installed all updates, and all of a sudden you get a buff error, just reset BIOS on default as above. It looks like some changes in the Windows 10 extension or one of the updates that broke BIOS compatibility and the current BIOS settings expelled a malicious error.

    Suppose someone has an IBM ThinkPad laptop, but even when you turn it on, they see a black browser with a fan failure message. What happened ?

    A fan bought a farm in my trusty IBM T42 a few weeks ago. This resulted in a significant increase in the temperature of the device based on the fact that many fan error texts were displayed during startup. It eventually got to the point where I had to blow compressed air into the fan exhaust grille for seconds to boot up to get the BIOS to think the fan was actually spinning.

    ibm computer fan error

    According to IBM Hardware Maintenance Report (HMM) for ThinkPad T40p, t40, T41, T41p, T42, T42p, this is withthe error message indicates a problem with the tracker on page

    ibm computer fan error

    In the Symptom-to-FRU Index, this section lists symptoms and errors in addition to their possible causes.

    Looks like it’s time to replace the fan. The air conditioner fan is the most important radiator, so you will need to replace the entire fan.

    You can simply replace the unit after removing the palm rest while using the keyboard.

    1. Remove the battery and unplug the AC adapter from the outlet.
    2. Remove the four screws from the yellow circle ski. These screws are commonly used to secure the keyboard.
    3. Eight screws remove marked improvement with orange circles. These screws buy the palm rest.
    4. Take my keyboard and disconnect the TV keyboard from the motherboard.
    5. Raise the palm rest and disconnect the touchpad cable from the system board.
    6. Remove the approximately three screws that secure the fan assembly and disconnect the fan from the system board cable. Lift and replace the interactive fan.

    How do I fix my Lenovo fan noise?

    Method 1: check CPU usageMethod two: clean the ventilation sprers.eu 3: close sprers.eu 4: Update BIOS and Electrical Manager (if you suspect there is a problem with the BIOS / EC thermostat)

    You can find step-by-step instructions on disassembling a laptop and replacing a fan from HMM in the chapter “Removing and one of the FRUs” in Story

    You can find the new fan structure by looking at the FRU number of your failed fan. Besides 13R, it might look like 91P, 26R, 13R, 13N Just search for the FRU group on Google and find a place to get it. Different types of laptops with different screen sizes use different tags, so you need to find each one that suits your variety. If for some reason your Monster Party does not have a FRU mobile number, you will need to go to HMM page On these pages, you will find witch fans that belong to your laptop.
    For example, if you are using an Enjoy FVU laptop with a 15 ” LCD screen, you will need a Freak kit with FRU: 13R

    Repair your computer now.

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    IBM ThinkPad displays fan error message

    IBM ThinkPad T42 fan

    Let&#;s say you have an IBM ThinkPad laptop and when you turn it on all you get is a black screen with &#;Fan error&#; message. What could be wrong?

    A few weeks ago, the fan in my trusty IBM T42 bought the farm. This resulted in the unit heating up considerably, as well as numerous &#;fan error&#; messages on bootup. It eventually became so bad that to boot up at all, I had to blow compressed air into the fan&#;s exhaust grill for seconds, in order to fool the BIOS and make it believe the fan was actually spinning.

    According to the IBM hardware maintenance guide (HMM) for ThinkPad T40, T40p, T41, T41p, T42, T42p this error message indicates a problem with the fan, you can find symptom-to-FRU index on the page

    The symptom-to-FRU index in this section lists symptoms and errors and their possible causes.

    Apparently it&#;s time to replace the fan assembly. The cooling fan comes together with the heat sink, that&#;s why you&#;ll have to replace the whole fan assembly.

    You can easily replace the assembly after you remove the palm rest and keyboard.

    1. Remove the battery and unplug the AC adapter.
    2. Remove four screws marked with yellow circles. These screws securing the keyboard.
    3. Remove eight screws marked with orange circles. These screws securing the palm rest.
    4. Lift up the keyboard and upnlug the keyboard cable from the motherboard.
    5. Lift up the palm rest and unplug the touchpad cable from the motherboard.
    6. Remove three screws securing the fan assembly, unplug the fan cable from the motherboard. Lift up and replace the fan assembly.

    IBM ThinkPad T42 take apart

    You&#;ll find step-by-step laptop disassembly and fan replacement instructions in the HMM in the chapter &#;Removing and replacing a FRU&#; on the page

    You can find a new fan assembly using the FRU number located on your failed fan, it might look like 91P, 26R, 13R, 13N, or 13R Just google the FRU number and find a place to buy it from. Different laptop types with different screen sizes use different fans, so you have to find the correct one witch fits your model. If for some reason your fan assembly doesn&#;t have the FRU number, you&#;ll have to refer to the HMM page On these pages you&#;ll find witch fan belongs to your laptop.
    For example, if have a type FVU laptop with &#; LCD screen, then you need a fan assembly with FRU: 13R

    IBM ThinkPad T42 fan FRU


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