Viking VDSC Range Code Comm: Display and EOC4 Lost Contact

What Comm means

On Viking Professional VDSC5xxT dual-fuel ranges with EOC4 control and VDSC display boards, such as the VDSC530T-4B or VDSC548T-4GQ, Comm means the control and display are not talking. There is either a loose communication link between the EOC4 and the VDSC display, or the RS485 serial link was lost or never established between the EOC4 and a user interface. Keys and heating may not respond.

Common causes of Comm

Loose ribbon or cable between EOC4 and the display
RS485 serial link lost or unable to start
Corroded or loose connector at a board
EOC4 or display board with a communication problem

✓ One safe check you can try

1. Turn the oven off. 2. Switch the range breaker off for one full minute, then restore power. 3. Wait for the display to start up. 4. Do not press keys repeatedly while it boots. 5. If Comm returns, leave the range off and call us, because the boards sit behind the control panel.

! Why to stop there

The communication cable sits behind the control panel
A guess at which board is bad can mean buying two boards
Technicians read the link with a meter before replacing anything

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

→Same appliance

Other Range codes

Meat ProbeViking VDSC Range Code Meat Probe: Probe Shorted or Misreading DoorViking VDSC Range Code Door: Opened in the Middle of a Clean Cycle Model HeaderViking VDSC Range Code Model Header: Missing or Wrong for the Display Door LatchViking VDSC Range Code Door Latch: Lock Slow or in the Wrong Position No ProbeViking VDSC Range Code No Probe: The Meat Probe Input Reads Open DSI 1 FlashViking Range Code DSI 1 Flash: Normal Ignition Module Heartbeat Red backlight / flashing knob ringsViking 7 Series Range Alert: red backlight and flashing knob rings DSI 2 or 5 FlashesViking Range Code DSI 2 or 5 Flashes: Ignition Control Problem

CommComm questions

Does Comm mean I need a new control?

Not necessarily. A loose link is the first thing we check, and reseating a connector can solve it. Only if the link is good do we look at the boards themselves.

Why is the display blank or frozen with Comm?

The display depends on the serial link to the EOC4. If the link drops, the display cannot show the oven status or take key presses.

What does a visit cost?

We give a written price before work begins. If the repair is a connector, it is usually the lower of the two kinds of fix, and it carries a 30-day workmanship warranty.