Frequently Asked Questions

The questions below are frequently asked during customer service calls we have received.  The answers are a summary only.  The applicable product user guide should be consulted for a more complete explanation.  In addition, the answers do not take the place of guidance or instructions you may receive from your health care provider.  The information provided is not intended to be used for medical diagnosis or treatment or as a substitute for professional medical advice.  If you still require assistance after consulting the guidance below, you may also contact our customer service team at (877) 801-6901. If you are having a medical emergency, please call 911.
We have also created Quick-reference sheets that walk through how to use some of the most commonly used features of our pumps. They can be found, along with all the Tandem product user guides, on our Documents and Resources page.  


Tandem Pumps


How do I change my basal rate(s)/carb ratio(s)/correction factor(s)/target BG(s)?

Click here for a document that walks you through the process for editing your Personal Profiles, which control all of those settings.

My replacement pump shows “units” instead of “grams” on the bolus screen. How do I change it?

Follow the above instructions to edit your active Personal Profile. Under “Bolus Setting” change Carbs to ON.

How do I enter a BG without delivering a bolus?

  1. From the home screen, tap BOLUS
  2. Tap Add BG
  3. Using the onscreen keypad enter your BG
  4. Tap DONE
  5. If your BG is above your target, you will be asked if you would to add a Correction Bolus. Tap NO. If you have insulin on board, you will be cautioned your BG may drop low and advised to re-test BG as necessary.
  6. Tap the T button to return to the Home Screen.
  7. You will be warned that you may be in the middle of a process that impacts insulin delivery. Your pump will confirm that you want to exit and return home. Tap YES.
  8. Your BG has been recorded.

How do I change the time and date on my pump?

Edit Time
  1. From the Home Screen, tap OPTIONS.
  2. Tap My Pump.
  3. Tap Pump Settings.
  4. Tap Time and Date.
  5. Tap Edit Time.
  6. Tap Time.
  7. Using the onscreen keypad, enter the hour and minutes. Verify and tap DONE.
  8. Tap Time of Day to set AM or PM.
  9. Verify the correct time is set and tap SAVE.
  10. Any edits to Time or Date will not be saved until you tap SAVE.

Edit Date
  1. From the Time and Date screen tap Edit Date.
  2. Tap Month.
  3. Find and tap the current month displayed on the right. Use Up/Down Arrow to view months not displayed.
  4. Tap Day. Using the onscreen keypad enter the current day. Verify and tap DONE.
  5. Tap Year.
  6. Using the onscreen keypad enter the current year. Verify and tap DONE.
  7. Verify the correct date is set and tap SAVE.
  8. Tap Tandem Logo to return to the Home Screen.

What does the “+” mean in my insulin gauge?

After tubing fill is complete, when the pump returns to the Home Screen, an estimate of how much insulin is in the cartridge is displayed in the upper right portion of the screen.

A + before the number indicates that more than the number of units shown have been detected in the cartridge. After 10 units are delivered, a specific number of units remaining in the cartridge will be displayed on the Home Screen.

The amount of insulin remaining displayed on the Home Screen will decrease 5 units at a time (for example, you will see 140, 135, 130, 125). When less than 40 units remain (90 units in t:flex Pumps), it will begin decreasing 1 unit at a time (for example, you will see 40, 39, 38, 37) until there is 1 unit remaining.

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I need to ship my pump or store it for an extended period of time. How do I place my pump in storage mode?
  1. Plug a USB cable into the micro-USB port of your Tandem pump and connect it to a power source.
  2. If properly connected, you should hear an audible alert and a charge symbol (lightning bolt) will appear on the battery level indicator.
  3. Press and hold the Wake Button for approximately 30-40 seconds.
  4. When the pump beeps/vibrates three times, release the button.
  5. To confirm the pump is in Storage Mode, unplug the pump from the power source and press the Wake Button. The screen should not illuminate.
  6. If the screen illuminates, repeat steps 1-4.

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I am going to swim/bathe/exercise for up to an hour. What should I do with my pump?

Your infusion set allows you to temporarily disconnect at the site. Your set comes with a cover and instructions to use aseptic (clean) technique when disconnecting. There are two ways to stop insulin delivery on your pump:

  1. You may choose to suspend delivery while disconnected from your pump. Your hourly basal rate represents the maximum amount of insulin that will be wasted if you disconnect for an hour. Remember, you are not getting any basal insulin while disconnected, so limiting the time you are disconnected and remembering to “Resume” your insulin delivery are very important.

    Click here for a document that walks you through the process for suspending and resuming insulin.

  2. An alternate option for suspending insulin delivery is to set a Temporary Basal Rate of 0%. This feature can be set for anywhere from 15 minutes to 72 hours. To set a 0% Temporary Basal Rate:
  1. From the Home Screen, tap OPTIONS.
  2. Tap Temp Rate.
  3. Using the onscreen keypad, 0. Tap DONE.
  4. Using the onscreen keypad, enter desired length of time. Tap DONE.
  5. Verify settings and tap START.

Your BG level and your activity at the time of your disconnection are a few of the factors that will determine if you need to replace the basal insulin you missed. This is unique to both the individual and the situation and will vary greatly among users. We recommend discussing with your healthcare team.

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My pump’s screen appears scuffed and scratched. What should I do?
Your pump is shipped with a pre-applied screen protector. Please remove the screen protector to determine if the scratches are on the screen or the protector. Additional screen protectors can be ordered from Tandem Diabetes Care at (877) 801-6901.

My pump’s screen is cracked. What should I do?
Your pump’s screen is covered under the terms of our limited 4-year warranty under normal conditions of use. Please contact Customer Technical Support at (877) 801-6901 option 1.

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How do I change the rubber door on my pump’s USB port?

Removing the old door -
Take the case off before removing the rubber door. Grip the door firmly where it attaches to the pump, and pull to remove.

Installing a new door -
Push the pointed tab into the hole until you feel a snap.

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IOB (Insulin on Board)

What is “IOB”? Can I get rid of it?
The insulin on board (IOB) reflects how much insulin is remaining in your body from previous boluses that will continue to lower your blood glucose. This is sometimes referred to as “active insulin.” The insulin duration setting is needed to calculate IOB. It does not include any basal insulin, only insulin delivered as a food or correction bolus (including a Quick Bolus). Its accuracy is dependent on entering the correct Insulin Duration setting in your Personal Profiles.

There is no way to disable this feature.

What is “Duration of Insulin”?
Duration of Insulin is the approximate time that the remaining Insulin on Board (IOB) will remain in your body and continue to lower your blood glucose. This value is specific to your IOB. It does not refer to the length of delivery for any extended boluses that you have recently administered.

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Infusion Sets

How do I change my infusion set?

See our Documents and Resources page for more detailed instruction on all of the infusion sets we offer.

Where should I put my infusion set on my body?

Your infusion set can be worn anywhere on your body where you would normally inject insulin. The most commonly used sites are the abdomen, upper buttocks, hips, upper arms, and upper legs. Absorption may vary from site to site, so please work with your healthcare provider to determine the best options for your individual situation. Always avoid placing the infusion set directly on scars, moles, stretch marks, or tattoos.

NOTE: It's very important to rotate your set placement among the various sites. Infusing insulin into the same area can change the way that tissue absorbs insulin over time. Establish a rotation schedule that best fits your needs.

How do I change my contact™ detach Infusion Set without changing my tubing/cartridge?

Connect the new 3 inch tubing with coupling housing and needle to your tubing luer-lock BEFORE inserting new Set to your body. Use “Fill Tubing” to fill/prime the 3 inch tubing. When filling tubing, be sure to tap “Fill” when asked if you have installed a new cartridge or are filling tubing on existing cartridge.

You should see drips of insulin come out of the needle after a fill of approximately 2 units. Stop when drips are seen. Remove needle guard, insert set, and resume insulin delivery.

Can I change my infusion set without changing my tubing?

Yes, but be sure that you do not exceed the maximum time of use for any of your other supplies (tubing or cartridge) as a result of changing your infusion set early.

When filling the cannula on your new site, use “Fill Cannula” only, not ”Fill Tubing” UNLESS you use a contact™ detach Infusion Set, in which case refer to the next question below.

Can I change my tubing without changing my infusion set?

Yes, but be sure to fill your new tubing BEFORE connecting it to your infusion set.

Can I change my tubing and infusion set without changing my cartridge?

Yes. Follow the instructions for your particular infusion set. When filling tubing, be sure to tap FILL when asked if you have installed a new cartridge or are filling tubing on an existing cartridge.

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Traveling with an insulin pump

Can I take my pump through the full-body scanner or put the pump through the luggage X-ray machine at the airport?

Tandem pumps are designed to withstand common electromagnetic interference from airport metal detectors, but should not be exposed to X-ray screening, including whole body imaging scanners and baggage X-ray machines. Notify the security agent that your pump should not be exposed to X-ray and request an alternate means of screening. (e.g. pat down or disconnect at site and ask for hand inspection of device.) When disconnecting, be sure to only disconnect at the infusion site, not at the Luer connection. Disconnecting at the Luer connection will result in air in your tubing and can compromise insulin delivery.

What about other security screening devices?

Metal Detector - YES
Ok for Tandem Pumps. Notify security agent in advance that you are wearing a pump, since the pump will be detected.

Baggage X-ray Machines - NO
Notify the security agent that your pump should not be exposed to X-rays and request an alternate means of screening. (e.g. pat down or disconnect at site and ask for hand inspection of device.)

Full Body Scanners - NO
Although the newer models of these scanners are not X-rays, we have not tested Tandem pumps with these devices. We recommend requesting an alternate means of screening. (e.g. pat down or disconnect at site and ask for hand inspection of device.)

Can I travel with the unopened Travel Loaner Pump in my checked baggage that goes through the luggage X-ray machine?

Tandem pumps are designed to withstand common electromagnetic interference, including airport security systems, but was not tested for exposure to X-rays, including whole body imaging scanners and airport luggage X-ray machines. We recommend keeping the Travel Loaner Pump with you during travel, so that you always have access to it if anything should happen to your existing pump, or in case your luggage should get misplaced.

What if someone opens my Travel Loaner Pump box to inspect it? Will I have to pay for the pump?

It is important to reseal the box in the exact condition it came in as soon after this occurs as possible to keep the pump protected. If this happens, please let us know when you return the pump. We will inspect the pump when it is returned to ensure it was not used. As long as there is no sign of usage and the software indicates it was never activated, you will not be charged for the pump.


Data Management / t:connect Application


What if I forget my password?

You can reset your password directly from the t:connect Application. Just click the “Forgot Password” link on the login page and a link to reset your password will be sent to the email address in your profile.

How do I change or reset my password for my t:connect account?

To change your password:
  1. Log into your t:connect account.
  2. Click “Settings.”
  3. Click “My Account.”
  4. Under “About me” find “Password” and click “Change.”
  5. Enter your current password and your new password.
  6. Click “Save.”
  7. Your password has been changed.

How do I create a t:connect Application account?

  1. Run the t:connect Uploader software. The t:connect Uploader software should automatically start after you complete the installation. If it does not automatically start, double click the program’s icon on your desktop or applications folder. A small window will appear on your desktop.
  2. Connect your pump to your computer using the Tandem-supplied micro-USB cable. Note: You do not need to disconnect your infusion set or stop insulin delivery.
  3. The t:connect Uploader will detect your pump and display its serial number on the computer screen. Click the Start Upload button.
  4. The t:connect Uploader will prompt you to create a new account. Click the Get Started button.
  5. Select your account type. Note: If you already have an account, just sign in with your username (email address) and password to add your new pump to your existing t:connect account.
  6. Fill in the necessary details to create your account.
  7. Enter your Blood Glucose Limit values to personalize your reports.
  8. Check your email inbox for a welcome message from Tandem Diabetes Care, and click the link to confirm your email address.

How do I upload my pump to the t:connect Diabetes Management Application?

  1. Go to Click Get Started to download the t:connect Uploader.
  2. Click on the green button to download the t:connect Uploader, and follow the online steps to install it on your computer.

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