# Service bulletin TSB 623

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 11029124
- Published by NHTSA: 2026\-03\-02
- Manufacturer's number: TSB 623
- Manufacturer's date: 2026\-03\-02
- NHTSA component: UNKNOWN OR OTHER

## NHTSA's summary

The tank heat button will not activate tank heat on the TMSC\-100 in 2026 Supreme Aire and Summit Aire coaches.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11029124-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11029124-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Vehicles listed

- 2026 NEWMAR SUMMIT AIRE
- 2026 NEWMAR SUPREME AIRE

JSON: [/v1/bulletins/11029124](/v1/bulletins/11029124)

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