Troubleshooting Steps - Viessmann WB1A Series Installation And Service Instructions Manual

Troubleshooting

Troubleshooting Steps

Diagnosis 1. Establish fault message or diagnose behavior of system.
2. Look for corresponding cause of fault in the diagnostics table.
3. Find corrective action in the table.
Correction 4. Perform corrective action (page 65).
Overview of Controls and Indicators
68°/20°C
9
tr
Legend
tr boiler water temperature
selector dial
Display, fault and reset button
LCD display
60
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Diagnosis
H for faults with fault display on control unit (see below).
Please note:
9
tr
140°/60°C
176°/80°C
Opening the control unit
Controls and indicators are located
behind the hinged front cover.
Control and display elements
The control unit is preset at the factory
for standard operation. Your heating
system is ready for use. The factory
presets may be individually adjusted to
suit your specific requirements.