NHTSA ID Number: 11030316
Manufacturer Communication Number: LI83.70-P-080411
TSB/Document Date: 2026-03-30
Summary
Complaint No heating output is available during electric driving operation. In conventional (combustion engine) driving operation, full heating output is available. Cause Possible defect in the N33/5 water heater (high-voltage PTC booster heater) Remedy If the N33/5 water heater (PTC booster heater, high voltage) is defective, it must be replaced with the latest part number. Note: Please refer to the information in XENTRY Parts Information and the latest WIS description. For vehicles manufactured before December 2025 with a BorgWarner water heater, the coolant hoses (inlet and outlet) must also be ordered and installed. For vehicles produced after December 2025, only the N33/5 water heater (PTC booster heater high voltage) needs to be replaced.
No heating output during electric driving operation
Topic number
LI83.70-P-080411
Version
1
Function group
83.70 - Auxiliary/supplementary heater
Date
3/30/26
Validity
206,254,214,236
Reason for change
Complaint
No heating output is available during electric driving operation.
In conventional (combustion engine) driving operation, full heating output is available.
Cause
Possible defect in the N33/5 water heater (high-voltage PTC booster heater)
Remedy
If the N33/5 water heater (PTC booster heater, high voltage) is defective, it must be replaced with the latest part number.
Note:
Please refer to the information in XENTRY Parts Information and the latest WIS description.
For vehicles manufactured before December 2025 with a BorgWarner water heater, the coolant hoses (inlet and outlet) must also be ordered and installed.
For vehicles produced after December 2025, only the N33/5 water heater (PTC booster heater high voltage) needs to
be replaced.
Attachments
File
Description
Mit+Strömungsumkehr.jpg
30.03.2026 19:56
© Copyright Mercedes-Benz
AG
SAHARRY
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Vor+Strömungsumkehr.jpg
Water heater & coolant hoses illustration before
12/25
Disclaimer
NOTE: The information contained in this document is intended for use by trained, professional technicians with the
knowledge to properly and safely perform diagnosis and repairs on Mercedes-Benz vehicles, using Mercedes-Benz
30.03.2026 19:56
© Copyright Mercedes-Benz AG
SAHARRY
Page 2 / 3
approved tools and equipment. It informs service technicians about conditions that could occur in certain vehicles and
provides information that could assist in proper vehicle diagnosis, service, or repair. It does not indicate that a defect
is present in any vehicle referenced in this document nor does it imply warranty coverage. DO NOT assume that a
symptom or condition, or a described cause of a symptom or condition, affects any particular vehicle or groups of vehicles, or that a described repair applies to any particular vehicle or groups of vehicles. There can be multiple causes
resulting in the same or similar symptoms or conditions described in this document, and trained professional service
technicians must use their diagnostic skills to make evaluations on a case-by-case basis. The information contained
in this document does not guarantee warranty coverage nor does it extend the vehicle’s warranty in any way.
Symptoms
Body > Air conditioning > Stationary heater/auxiliary heater > Malfunction
Body > Air conditioning > Stationary heater/auxiliary heater > Insufficient heat output
Body > Air conditioning > Heater > Remains cold
Body > Air conditioning > Heater > Insufficient heat output
Parts
Part number
ES1 ES2 Designation
A2068352300
Quantity Note
WATER HEATER UNIT
EPC
1
X
Operation numbers/damage codes
Op. no.
Operation text
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© Copyright Mercedes-Benz AG
Time
Damage
code
H
8360M
SAHARRY
Note
Page 3 / 3
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TSB/Document ID: LI83.70-P-080411
Replacement Service Bulletin Number:
MFR Communication Date: 2026-03-30
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: VISIBILITY/WIPER
MFR Component System:
MFR Component Subsystem:
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