Portable - Viessmann D6 Error

When this error appears, your boiler may lock out (stop working) or run in a reduced "emergency" mode.

An external device like a low water cut-off or a flow switch has triggered a shutdown. viessmann d6 error

A: No. If D6 returns after each reset, a component is failing. Resetting is a temporary workaround, not a fix. When this error appears, your boiler may lock