Philips North America, LLC Philips HeartStart MRx, Monitor/Defibrillators with model numbers M3535A, M3536A, M3536M, M3536MC, M3536M2, M3536M3, M3536M4, M3536M5, M3536M6, M3536M7, M3536M8, M3536M9 - Product Usage: is intended for use in hospital and pre-hospital settings by qualified medical personnel trained in the operation of the device and qualified by training in basic life support, advanced cardiac life support or defibrillation. Recall
Check Your Product
According to the U.S. Food and Drug Administration (FDA)
Product
Philips HeartStart MRx, Monitor/Defibrillators with model numbers M3535A, M3536A, M3536M, M3536MC, M3536M2, M3536M3, M3536M4, M3536M5, M3536M6, M3536M7, M3536M8, M3536M9 - Product Usage: is intended for use in hospital and pre-hospital settings by qualified medical personnel trained in the operation of the device and qualified by training in basic life support, advanced cardiac life support or defibrillation.
Brand
Philips North America, LLC
Lot Codes / Batch Numbers
All devices are affected
Products Sold
All devices are affected
Philips North America, LLC is recalling Philips HeartStart MRx, Monitor/Defibrillators with model numbers M3535A, M3536A, M3536M, M3536MC, M due to The therapy switch may fail, resulting in the device exhibiting the following behaviors: the device may not perform the selected function, the therapy. Based on FDA medical device recall database.
Summary derived from FDA notice
Reason for Recall
As stated by FDA
The therapy switch may fail, resulting in the device exhibiting the following behaviors: the device may not perform the selected function, the therapy knob may not change to the energy setting selected, or the device may deliver a shock with an energy level different from the setting selected by the user. These device behaviors could result in a delay in therapy or a failure to deliver the intended therapy.
Recommended Action
Per FDA guidance
On July 16, 2020, the firm distributed an Urgent Medical Device Correction letter to all affected customers. Customers were informed of the product issue and were instructed to do the following: - The MRx is safe to use and can remain in service if the device does not exhibit any of the behaviors described in this Notice (the device may not perform the selected function, the therapy knob may not change to the energy setting selected, or the device may deliver a shock with an energy level different from the setting selected by the user.) - If an MRx device experiences a switch failure as described, contact your local Philips representative, who can arrange for a replacement of the switch at no charge. - Continue to perform the Shift and Operational Checks described in the Instructions for Use, Maintenance Chapter - To detect possible switch failures as early as possible, conduct Weekly Shock Tests (part of the Shift Check in the IFU) on a daily basis - It is not necessary to perform a Shock Test on days when an Operational Check is performed, since an Operational Check includes a Shock Test. - Keep a copy of the customer letter with each HeartStart MRx Instructions for Use. - To acknowledge receipt of this notification, please complete and fax the Customer Reply Form to the firm. If the MRx Therapy Switch fails, Philips will arrange for the replacement of the switch at no charge to the customer.
Verify this information on the official source
For complete details and official instructions, check the U.S. Food and Drug Administration (FDA) directly.
View official FDA recall noticePage updated: Jan 10, 2026