Answer
Feb 27, 2026 - 07:36 AM
The 9420-391 is a digital WiFi thermostat designed for systems with a compatible control board. Using it in place of 7330D335 would likely require significant rewiring and possibly upgrading the AC control module. If you are looking for a more direct replacement, we recommend 9420-351. Here is a link to it on our site: https://www.rvupgradestore.com/Wall-T...
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