F.92 ADIO module communication error

What the control is telling you

Affected module works in emergency mode.

Applies to: Vitodens 200-W B2HE 85, 120, 150, 199

Likely causes

• Wrong subscriber number
• Wiring fault
• PlusBus voltage problem

Test and repair steps

1. Check settings in the commissioning assistant.
2. Check connections and leads to the ADIO module.
3. Check PlusBus voltage (24 to 28 V).
4. Check subscriber number on rotary switch S1.

Models that show this code

4 models in Vitodens 200-W B2HE

Other codes on the same units

• F.77 BCU data memory error
• F.8 DHW storage tank sensor short circuit
• F.89 Internal circulation pump blocked
• F.91 DIO module communication error
• F.94 PlusBus voltage error
• I.56 External demand active
• I.57 External blocking active
• I.59 Parameters restored