NHTSA ID Number: 11029124
Manufacturer Communication Number: TSB 623
TSB/Document Date: 2026-03-02
Summary
The tank heat button will not activate tank heat on the TMSC-100 in 2026 Supreme Aire and Summit Aire coaches.
Newmar
Corporation
PO Box 30
Nappanee, IN 46550
TSB 623
Feb. 11, 2026
TECHNICAL SERVICE BULLETIN
AFFECTED MODELS
2026 :: Supreme Aire, Summit Aire
DESCRIPTION
The tank heat button will not activate tank heat on the TMSC-100 in 2026 Supreme Aire and
Summit Aire coaches.
ISSUE
If the coach is parked in freezing temperatures and the tank heat is not turned on when activated,
it may cause tank or gate valve damage due to the contents freezing.
UNITS AFFECTED
Please refer to the attached population list for affected units and VINs.
CORRECTIVE ACTION
Keep the tanks empty during freezing conditions until the update can be performed by an
authorized service facility using the attached work instructions. This update should be performed
at your earliest convenience.
PARTS NEEDED
Item Description
Quantity
V-Bus programmer (ATC# V-BUS-TMSC-100-TANK-HEAT1 ea. (returnable)
HL)
FLAT RATE CODE:
TSB 623
LABOR TIME:
Newmar Part #
039665
.2 hr.
NOTE
The Authorized Service facility will be charged for the programmer when ordered and credited
for the programmer when returned. Do not include the price of the programmer in the claim.
Return the programmer to Newmar for full credit.
If a Dealer has more than one unit on the lot; they would use the same re-programmer to
complete programming on all affected units prior to returning the programmer and claim(s). This
will keep the cost of shipping down. Include UPS ground shipping for return of the programmer
from (USA $12.50) from (Canada $28.00) on one claim if more than one unit at dealership.
IMPORTANT: Please read this bulletin in its entirety prior to beginning any diagnosis or repairs.
NOTICE: Any technical information published in this bulletin is intended for use only by a qualified, Newmar-authorized service technician. Newmar is not responsible for the misuse of this information.
V-BUS Re-Programming Terms
TMSC-100-TANK-HEAT-HL
Purpose:
Step-by-step instructions for re-programing V-BUS-TMSC-100-TANK-HEAT-HL
Issue being addressed:
- This update will require an individual tank to have 5% liquid in the tank before the tank heat relay
will turn ON. Note, tank heat relays are DISABLED by default when the battery disconnect is turned
ON and are only ENABLED when a user enables from a LCD.
- SUPREME AIRE, SUMMIT AIRE Only
Fig.1
IMPORTANT: DISCONNECT COACH FROM
SHORE POWER BEFORE STARTING THIS UPDATE!!
Required for Job
-
Time 3-5 minutes
V-Bus programmer (ATC# V-BUS-TMSC-100-TANK-HEAT)
Newmar# 039665
Step #1
-
Fig.2
Unplug the RV from shore power
Locate the TMSC-100
Look in passenger side compartment in front of the rear wheels
Step#2
-
12VDC battery disconnect needs turned “ON” before proceeding
Wait 60 Seconds!!
Plug in the updater to the 5-POS connector
Step#3
-
Fig.3
!!!Do not unplug or shut off power during this step!!!
This step should take around 1-2 minutes
Press the “START SWITCH”
Programming LED will flash RED while programming
V-Bus Activity LED will flicker GREEN during this time
Programming LED will light solid GREEN when finished
Step#4
-
PROGRAMMING in PROGRESS
PROGRAMMING in FINISHED
Fig.4
Un-Plug the V-BUS programmer
Log the update in the RV service notes.
Step#5
-
Have the V-Bus programmer “UPS Ground”
revA02 2-6-2026
Production #
270290
270291
270293
270295
270297
270299
270300
270301
270303
270306
270307
270308
270309
270310
270311
270312
270313
270314
270315
270316
270317
270318
270319
270320
270321
270322
270323
270324
270325
270326
270329
270331
270332
270333
280002
280003
280004
280005
280006
280007
280008
280009
280010
280013
280014
280015
280016
VIN Number
3ALHHLD10RDVE3577
3ALAHTDVXSSWE0159
1FVAHTDV0TLWH5063
1FVHHLD1XTLWH4577
1FVHHLD17TLWH4570
1FVHHLD14TLWH4574
1FVHHLD11TLWH4581
1FVHHLD13TLWH4579
1FVHHLD11TLWH4578
1FVHHLD16TLWN1656
1FVAHTDV8TLWH5070
1FVAHTDV8TLWH5067
1FVHHLD12TLWN1654
1FVHHLD17TLWN1665
1FVHHLD18TLWN1660
1FVHHLD13TLWN1663
1FVHHLD12TLWN1668
1FVHHLD15TLWN1664
1FVHHLD10TLWN1667
1FVHHLD1XTLWH4580
1FVHHLD11TLWN1662
1FVHHLD11TLWN1659
1FVHHLD10TLWN1653
1FVHHLD10TLWH4572
1FVAHTDVXTLWH5071
1FVAHTDV3TLWN4843
1FVHHLD14TLWN1672
1FVHHLD19TLWN1666
1FVHHLD10TLWN1670
1FVHHLD19TLWS9019
1FVAHTDV4TLWH5065
1FVHHLD19TLWS9022
1FVHHLD18TLWN1674
1FVHHLD17TLWS9021
3ALHHLD1XSSWC5432
1FVHHLD18TLWH4576
1FVHHLD19TLWH4571
1FVHHLD14TLWN1655
1FVHHLD18TLWN1657
1FVHHLD10TLWH4569
1FVHHLD12TLWH4573
1FVHHLD1XTLWN1661
1FVHHLD16TLWH4575
1FVHHLD12TLWN1671
1FVHHLD19TLWH4568
1FVHHLD1XTLWN1675
1FVHHLD13TLWH4582
Year
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
Brand
SA
SA
SA
SA
SA
SA
SA
SA
SA
SA
SA
SA
SA
SA
SA
SA
SA
SA
SA
SA
SA
SA
SA
SA
SA
SA
SA
SA
SA
SA
SA
SA
SA
SA
SM
SM
SM
SM
SM
SM
SM
SM
SM
SM
SM
SM
SM
Type Floor Plan Chassis Brand
CC
4505 FS
4129 FS
CC
CC
4129 FS
CC
4341 FS
CC
4505 FS
CC
4505 FS
CC
4341 FS
CC
4341 FS
CC
4341 FS
CC
4341 FS
3827 FS
CC
CC
3827 FS
CC
4505 FS
4540 FS
CC
CC
4505 FS
4505 FS
CC
CC
4505 FS
CC
4341 FS
CC
4505 FS
CC
4341 FS
CC
4341 FS
CC
4341 FS
CC
4505 FS
CC
4505 FS
CC
3827 FS
CC
3827 FS
CC
4505 FS
CC
4505 FS
CC
4341 FS
CC
4341 FS
CC
4129 FS
CC
4540 FS
CC
4505 FS
CC
4505 FS
CC
4505 FS
CC
4505 FS
CC
4505 FS
CC
4505 FS
CC
4505 FS
CC
4505 FS
CC
4505 FS
CC
4505 FS
CC
4505 FS
CC
4540 FS
CC
4505 FS
CC
4505 FS
CC
4505 FS
Date In Production
Date Off Production
1/10/2025
1/23/2025
1/16/2025
2/17/2025
4/8/2025
4/23/2025
4/10/2025
4/24/2025
6/5/2025
6/17/2025
4/30/2025
5/14/2025
4/9/2025
4/24/2025
6/9/2025
6/19/2025
4/28/2025
5/8/2025
6/18/2025
7/7/2025
7/17/2025
8/11/2025
7/15/2025
7/25/2025
6/16/2025
6/25/2025
7/28/2025
8/6/2025
7/14/2025
7/24/2025
7/21/2025
7/30/2025
6/26/2025
7/15/2025
7/25/2025
8/6/2025
7/11/2025
7/22/2025
6/3/2025
6/11/2025
7/21/2025
7/9/2025
6/20/2025
7/8/2025
6/25/2025
7/11/2025
7/22/2025
7/31/2025
7/23/2025
8/4/2025
7/31/2025
8/13/2025
8/28/2025
9/11/2025
9/23/2025
10/8/2025
9/17/2025
10/1/2025
12/2/2025
12/12/2025
10/13/2025
10/23/2025
11/20/2025
12/5/2025
11/10/2025
11/20/2025
11/18/2025
12/2/2025
1/22/2025
2/5/2025
4/16/2025
4/30/2025
5/5/2025
5/16/2025
6/16/2025
6/24/2025
6/4/2025
6/16/2025
6/12/2025
6/23/2025
5/8/2025
5/21/2025
7/24/2025
8/4/2025
5/15/2025
6/10/2025
8/11/2025
8/20/2025
6/17/2025
6/26/2025
8/13/2025
8/25/2025
5/19/2025
6/2/2025
Production #
280017
280018
280019
280020
280021
280022
280024
VIN Number
1FVHHLD1XTLWN1658
1FVHHLD11TLWN1676
1FVHHLD14TLWN1669
1FVHHLD13TLWN1677
1FVHHLD16TLWN1673
1FVHHLD15TLWS9020
1FVHHLD18TLWS9027
Year
2026
2026
2026
2026
2026
2026
2026
Brand
SM
SM
SM
SM
SM
SM
SM
Type Floor Plan Chassis Brand
CC
4505 FS
4540 FS
CC
CC
4505 FS
CC
4505 FS
CC
4505 FS
CC
4505 FS
CC
4505 FS
Date In Production
Date Off Production
7/16/2025
7/28/2025
8/19/2025
8/28/2025
7/31/2025
8/12/2025
8/21/2025
9/4/2025
10/6/2025
10/20/2025
10/22/2025
11/3/2025
11/21/2025
12/8/2025
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TSB/Document ID: TSB 623
Replacement Service Bulletin Number:
MFR Communication Date: 2026-03-02
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: UNKNOWN OR OTHER
MFR Component System:
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