Description
⚡ Balboa VS501SZ Spa Circuit Board — 54378-03 — Dual-Voltage 120V/240V Serial Standard Spa Control
Professional-grade replacement board for reliable VS501SZ spa control and performance.
⚠️ IMPORTANT — PLEASE READ BEFORE ORDERING
- ⚠️ CHIP NUMBER WARNING — TWO VISUALLY SIMILAR CHIPS: This board (54378-03) is associated with chip INFI07R* (with the letter “I” as the 4th character). A closely related but different board carries chip INF107R* (with the number “1” as the 4th character). These chips look nearly identical on the label. Confirm your chip character by character before ordering.
- Identify your board by chip number. Do not order based on appearance alone.
- Dual-voltage system — 120V or 240V. This board supports both 120VAC and 240VAC service depending on how your spa is wired. Verify your supply voltage before ordering.
- Older heater strap connection. This board uses the traditional copper strap heater connection (not Plug’n’click). A Plug’n’click upgrade is available — see the Installation section for details.
- Circuit boards are non-returnable. Contact Parts4Tubs to verify chip number and compatibility before ordering.
