Thetford parts reference
Thetford 639700
Kit Thermister
639700 is the Thetford part number for the kit thermister. It is printed in Thetford’s own parts documentation, which we hold a copy of and link below.
Thetford says to use 638391 instead
Thetford marks this number with “USE 638391” on its own parts list, which is the manufacturer telling you 638391 is what to order now. That instruction comes from the document, not from us, and not from what sellers happen to call the part.
Current number: 638391
Which parts lists carry this number
It appears on the parts list for the N7/N8 POLAR Series.
Where this comes from
- Published by
- Thetford
- Retrieved
- 2026-08-28
- File checksum (SHA-1)
43f5ed0dbbcdea6ac598ea1da276ccbfcb2f2b23
What we have not checked
We can show you that 639700 is a real Thetford number, what Thetford calls it, and which parts lists carry it. We have not verified that it fits your camper. That depends on your model year, build date and what is actually installed, and we do not publish a fitment claim until we can show it in the manufacturer’s own document.
Current marketplace inventory
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