Viessmann OpenTherm Installation And Service Instructions For Contractors

25
If there is a fault, "Error" is shown on
the display of the room temperature
controller.
Press INFO; the fault message
appears.
Fault message Meaning
"Error D0" Lead break, flow temperature sensor for low loss
header
"Error D1" Short circuit, flow temperature sensor for low loss
header
"Error D2" Lead break, flow temperature sensor in heating
circuit with mixer
"Error D3" Short circuit, flow temperature sensor in heating
circuit with mixer
"Error D5" OpenTherm connection between heat generator
control unit and mixer extension kit not connec-
ted or faulty
Fault messages
Fault messages
5837721
Service

Viessmann OpenTherm Specifications

General

Brand	Viessmann
Model	OpenTherm
Category	Temperature Controller
Language	English