NHTSA ID Number: 11029125
Manufacturer Communication Number: TSB 624
TSB/Document Date: 2026-03-02
Summary
The ATC OASIS-GEN1-1A (Newmar
# 165355) controller will randomly fail to turn a furnace blower ON or OFF when the ATC HVAC-GEN1-2A1 (Newmar # 00300876-AA) sends a VBUS command.
Newmar Corporation
PO Box 30
Nappanee, IN 46550
TSB 624
Feb. 23, 2026
TECHNICAL SERVICE BULLETIN
AFFECTED MODELS
2026 :: Grand Star, Ventana, Super Star, Dutch Star, Supreme Aire, New Aire, Summit Aire,
Mountain Aire, London Aire, Essex, King Aire
Note: This TSB only applies to coaches produced before 1/30/26 and equipped with Oasis
hydronic heating and Coleman air conditioners.
ISSUE
The ATC OASIS-GEN1-1A (Newmar # 165355) controller will randomly fail to turn a furnace
blower ON or OFF when the ATC HVAC-GEN1-2A1 (Newmar # 00300876-AA) sends a VBUS
command.
UNITS AFFECTED
Please refer to the attached population list for affected units and VINs.
CORRECTIVE ACTION
Follow the attached instructions to complete an update to the ATC/KIB system.
PARTS NEEDED
Item Description
V-Bus programmer (ATC# SW-V-BUS-BRIDGE6-HVAC-2A)
FLAT RATE CODE:
TSB 624
LABOR TIME:
Quantity
Newmar
Part #
1 ea. (Returnable) 039651
.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 cost of the programmer on the claim, and
return it to Newmar for full credit.
If a dealer has more than one affected coach in stock, use the same programmer on all affected
coaches before returning and submitting claim(s) to Newmar to keep the cost of shipping down.
If more than one coach requires reprogramming, please include the cost of UPS ground shipping
(USA $12.50/Canada $28.00) for the return of the programmer on a single claim when submitting
claims for multiple coaches to Newmar.
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
SW-V-BUS-BRIDGE6-HVAC-2A
Purpose:
Step-by-step instructions for re-programing SW-V-BUS-BRIDGE6-HVAC-2A
Issue being addressed:
Oasis furnace blowers get stuck ON or OFF compared to the LCD setting.
IMPORTANT: DISCONNECTED COACH FROM SHORE
POWER BEFORE STARTING THIS UPDATE!!
Fig.1
Required for Job
-
Time 3-5 minutes
V-Bus programmer (ATC# SW-V-BUS-BRIDGE6-HVAC-2A)
Newmar# 039651
Step #1
-
Unplug the RV from shore power
Locate the TMSC-100
Look in passenger side compartment in front of the rear wheels
Fig.2
Step#2
-
12VDC battery disconnect needs turned “ON” before proceeding
Wait 60 Seconds!!
Plug in the updater to the 5-POS connector
PROGRAMMING in PROGRESS
Step#3
-
!!!Do not unplug or shut off power during this step!!!
This step should take around 2-3 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
Fig.3
Step#4
-
Un-Plug the V-BUS programmer
Log the update in the RV service notes.
PROGRAMMING in FINISHED
Fig.4
Step#5
-
Have the V-Bus programmer “UPS Ground”
returned with claim to Newmar
revA01 2-3-2026
Prod#
230683
230684
230685
230686
230690
230695
230699
230701
230702
230703
230704
230705
230706
230707
230708
230709
230710
230711
230712
230713
230714
230716
230717
230718
230719
230720
230721
230722
230723
230725
270307
270308
270310
270311
270312
270313
270314
270315
270317
270320
270321
270322
270323
VIN Number
1FVAC5FE0THWN5877
1FVAC5FE2THWN5878
1FVAC5FE4THWN5879
1FVAC5FE7THWN5875
1FVAC5FE0THWN5880
1FVACYFE5SHVK9191
1FVAC5FE4THWG9471
1FVACYFE7SHVK9175
1FVACYFEXSHVK9199
1FVACYFE4SHVK9201
1FVAC5FE2THWN5881
1FVAC5FE6THWG9472
1FVACYFE9SHVK9209
1FVACYFE3SHVK9190
1FVACYFE8SHVK9198
1FVAC5FE4THWN5882
1FVACYFE3SHVK9187
1FVACYFE4SHVK9182
1FVACYFE2SHVK9195
1FVACYFE1SHVK9186
1FVAC5FEXTHWS8573
1FVACYFE6SHVK9197
1FVAC5FE8THWN5884
1FVACYFE5SHVK9322
1FVACYFE2SHVK9200
1FVACYFE3SHVK9206
1FVACYFE2SHVK9178
1FVACYFE6SHVK9183
1FVAC5FEXTHWN5885
1FVACYFE8SHVK9203
1FVAHTDV8TLWH5070
1FVAHTDV8TLWH5067
1FVHHLD17TLWN1665
1FVHHLD18TLWN1660
1FVHHLD13TLWN1663
1FVHHLD12TLWN1668
1FVHHLD15TLWN1664
1FVHHLD10TLWN1667
1FVHHLD11TLWN1662
1FVHHLD10TLWH4572
1FVAHTDVXTLWH5071
1FVAHTDV3TLWN4843
1FVHHLD14TLWN1672
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
Br
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SA
SA
SA
SA
SA
SA
SA
SA
SA
SA
SA
SA
SA
Tp Date In Production
Date Off Production
CC
8/18/2025
8/27/2025
8/7/2025
8/19/2025
CC
CC
8/25/2025
9/5/2025
CC
8/5/2025
8/15/2025
CC
9/4/2025
9/16/2025
CC
7/10/2025
7/22/2025
CC
8/4/2025
8/14/2025
7/15/2025
6/26/2025
CC
8/27/2025
9/10/2025
CC
CC
8/26/2025
9/9/2025
CC
9/11/2025
9/25/2025
CC
9/9/2025
9/22/2025
CC
11/17/2025
12/2/2025
10/14/2025
10/27/2025
CC
CC
10/7/2025
10/21/2025
CC
10/23/2025
11/4/2025
CC
10/16/2025
10/30/2025
CC
10/16/2025
10/29/2025
CC
10/9/2025
10/22/2025
CC
10/15/2025
10/29/2025
CC
10/23/2025
11/4/2025
CC
11/19/2025
12/3/2025
CC
10/29/2025
11/10/2025
CC
10/31/2025
11/12/2025
CC
11/3/2025
11/13/2025
CC
11/4/2025
11/17/2025
CC
11/6/2025
11/19/2025
CC
11/13/2025
11/24/2025
CC
11/14/2025
11/26/2025
CC
11/12/2025
11/21/2025
CC
7/17/2025
8/11/2025
CC
7/15/2025
7/25/2025
CC
7/28/2025
8/6/2025
CC
7/14/2025
7/24/2025
CC
7/21/2025
7/30/2025
CC
6/26/2025
7/15/2025
CC
7/25/2025
8/6/2025
CC
7/11/2025
7/22/2025
CC
7/9/2025
7/21/2025
CC
7/22/2025
7/31/2025
CC
7/23/2025
8/4/2025
CC
7/31/2025
8/13/2025
CC
8/28/2025
9/11/2025
Prod#
270324
270325
270329
270331
270333
270334
280009
280013
280015
280017
280018
280019
280020
280021
280022
280024
416534
416535
416536
416538
416540
416541
416543
416545
416547
416548
416551
416552
416556
416557
416558
416559
416561
416562
416563
416566
416567
416568
416569
416570
416571
416572
416573
VIN Number
1FVHHLD19TLWN1666
1FVHHLD10TLWN1670
1FVAHTDV4TLWH5065
1FVHHLD19TLWS9022
1FVHHLD17TLWS9021
1FVHHLD10TLWS9023
1FVHHLD1XTLWN1661
1FVHHLD12TLWN1671
1FVHHLD1XTLWN1675
1FVHHLD1XTLWN1658
1FVHHLD11TLWN1676
1FVHHLD14TLWN1669
1FVHHLD13TLWN1677
1FVHHLD16TLWN1673
1FVHHLD15TLWS9020
1FVHHLD18TLWS9027
4UZFCHFE0TCWT5186
4UZACHFE1TCWT5188
4UZFCHFE2TCWT5187
4UZFCHFEXTCWS4437
4UZACHFEXTCWS8482
4UZACHFE1TCWT0248
4UZACHFE5SCWE4311
4UZFCHFE8TCWM8302
4UZFCHFE3TCWR9223
4UZFCHFE8TCWS4436
4UZACHFE4TCWS9014
4UZACHFE1TCWS8483
4UZFCHFE5TCWS9013
4VZAT1D18TC096109
4UZACHFE6TCWS9015
4UZACHFE8TCWS8481
4VZAT1D19TC096071
4VZAT1D12TC096087
4VZAT1D10TC096086
4UZACHFE3TCWT5189
4VZAT1D19TC096085
4VZAT1D16TC096108
4UZFCHFE6TCWT1028
4UZFCHFE1TCWS8487
4UZFCHFE3TCWT4887
4UZACHFE9TCWT7657
4UZACHFE7TCWT7656
Year
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
2026
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2026
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2026
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2026
2026
2026
2026
2026
2026
2026
Br
- Fits: 37945
- Front face: 7" round / Back: 5" / Extension: 2"
- Louver ceiling vent for ducted A/C system with 5" opening.
- Newmar
Class A Entry Door Lock Assembly - Designed... - Size - Handle assembly measures 7 3/4 inches tall and...
- Deadbolt Extension Range - Deadbolt measures 1 7/8 inches in...
- Complete Handle Kit Included - The kit includes the interior...
Last update on 2026-06-23 / Affiliate links / Images from Amazon Product Advertising API
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TSB/Document ID: TSB 624
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:
MFR Component Subsystem:
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