Any dealer, manufacturer, or contractor who installs a manufactured home warrants that the manufactured home is installed in accordance with the state installation code, chapter 296-150B WAC. The warranty contained in this section may not be waived, limited, or modified. Any provision attempting to waive, limit, or modify the warranty contained in this section is void and unenforceable. This section does not apply when the manufactured home is installed by the purchaser of the home.