What Fan Hall Means
Four flashes of the cycle light followed by a four-second pause with the clean light steady on is charted as Fan Hall on Viking's freestanding gas range platform - the Hall effect sensor that reports cooling fan speed is not giving the control a usable signal. It is listed in the RVGR3305B service manual (2013, page 9); the same four-flash pattern reads as High Limit on Viking's dual-fuel and induction charts.
Common Causes of Fan Hall
- Hall effect speed sensor failed
- Cooling fan motor stalled, so there is no speed to report
- Wiring between the sensor and the control board broken
🔧 One Safe Check You Can Try
Stop baking rather than continuing, and listen for whether the cooling fan runs at all when the oven is called on. A Hall sensor problem and a stalled fan sound completely different from the front, and that observation is worth passing on.
⚠ Why You Shouldn't Go Further Than That
- The cooling fan exists to keep heat away from the control electronics, so a cavity used while its speed signal is missing turns a sensor job into a board job.
- A failed sensor on a healthy fan and a genuinely stalled fan produce the same indication, and only a reading at the sensor separates them.
- Four flashes means a different problem on Viking's other range platforms, so the chart has to be matched to the model before parts are ordered.
Opening a panel to inspect or repair something yourself doesn't automatically cancel your manufacturer's warranty — but it can risk accidental damage, and some manufacturers do have specific service conditions. Check your product's warranty terms, or ask us, before deciding.