F.94 — Electronics modules connected to PlusBus not functioning (Voltage error PlusBus)

What does F.94 mean?

Electronics modules connected to the PlusBus are not functioning due to a voltage error on the PlusBus. This could be caused by too many devices connected or a short circuit in the wiring.

• PlusBus power supply on HMU faulty
• Too many Vitotrol 200-E units connected (more than 2)
• Short circuit at the PlusBus cable

Click steps to track your progress.

1. 1

   Reset the appliance.

2. 2

   Check that no more than 2 Vitotrol 200-E units are connected to the HMU.

3. 3

   If the fault persists, contact a qualified technician to check the PlusBus power supply and cable for a short circuit.