A0 Fault Message Module 2: Safety Equipment 1 - Viessmann VITOTRONIC 300 Installation And Service Instructions Manual

Troubleshooting
Fault messages
(cont.)

A0 Fault message module 2: Safety equipment 1

Boiler cools down.
Cause
Fault, safety equipment at "X7" of plug-in adaptor 2 for
external safety equipment
A1 Fault message module 2: Safety equipment 2
Boiler cools down.
Cause
Fault, safety equipment at "X3" of plug-in adaptor 2 for
external safety equipment
A2 Fault message module 2: Safety equipment 3
Boiler cools down.
Cause
Fault, safety equipment at "X2" of plug-in adaptor 2 for
external safety equipment
A3 Fault message module 2: Safety equipment 4
Boiler cools down.
Cause
Fault, safety equipment at "X1" of plug-in adaptor 2 for
external safety equipment
A7 Fault clock module in programming unit
Control mode
Cause
Fault, clock module programming unit
AA Configuration fault, TSA function
Control mode
Cause
Therm-Control configuration fault: Plug
ted.
AB Configuration fault, heat exchanger set
Control mode, DHW cylinder may be cold.
124
Measure
Check safety equipment, and reset if required.
Measure
Check safety equipment, and reset if required.
Measure
Check safety equipment, and reset if required.
Measure
Check safety equipment, and reset if required.
Measure
Replace the programming unit.
Measure
not inser- Insert plug
aJA
■
Only for gas condensing boilers, e.g. Vitocrossal:
■
Parameter "0D:0" in the "Boiler" group must be set.
.
aJA