What to do if Viessmann Control Unit shows '!T DHW max. exceeded'?
The '!T DHW max. exceeded' error on your Viessmann Control Unit indicates an excessive temperature protection function has been activated. The system will automatically restart when the DHW temperature drops below the set temperature. If this fault occurs frequently, inspect the buffer cylinder temperature and reduce it if necessary.
What does '!Pump constantly ON' mean on my Viessmann Control Unit, and how to fix it?
The '!Pump constantly ON' message on your Viessmann Control Unit indicates that the primary pump is permanently active. You should check the primary pump and replace it if required.
What does '!Prim. circ.' mean on Viessmann Control Unit, and how do I fix it?
The '!Prim. circ.' error on your Viessmann Control Unit indicates a fault in the primary circuit, specifically a primary pump failure. Check the primary pump and replace it if required.
What does '!DHW circ. pump' mean on my Viessmann VITOTRANS 353, and what should I do?
The '!DHW circ. pump' error on your Viessmann Control Unit signals a failure of the DHW circulation pump. You should check the DHW circulation pump and replace it if required.
What does '!Timeout slave' mean on Viessmann Control Unit, and how to fix it?
The '!Timeout slave' error on your Viessmann Control Unit indicates a VBus failure, meaning the slave is not sending a response. Check the VBus and replace it if required.
How to resolve '!T FL' error on Viessmann VITOTRANS 353?
The '!T FL' error on your Viessmann Control Unit indicates a failure of the T-cyl FL sensor. Check the sensor and replace it if necessary.
General| Brand | Viessmann |
|---|---|
| Model | VITOTRANS 353 |
| Category | Control Unit |
| Language | English |
Covers user responsibilities, safety symbols, target audience, and general precautions.
Details safe connection, electrical requirements, operational procedures, and potential hazards.
Addresses risks from flammable materials, extractors, and component safety.
Specifies the appliance's purpose, limitations, and contractor commissioning process.
Outlines default settings for heating, DHW, frost protection, and time.
Identifies and locates the main physical parts of the boiler.
Explains the programming unit, its display, and navigation keys.
Covers heat-up preparations, fuel requirements, and manual heating procedures.
Details menu structure, navigation, and key functions for system operation.
Configuring time periods for the electric ignition system.
Adjusting standard and reduced room temperatures for heating circuits.
Configuring heating schedules, modes, and time phases.
Optimizing heating response based on outdoor temperatures.
Adjusting the desired domestic hot water temperature.
Configuring schedules and operating modes for domestic hot water.
Accessing fault messages, scanning information, and temperatures.
Resolving problems like cold/hot rooms and DHW malfunctions.
Overview of required inspections, cleaning intervals, and general care.
Detailed instructions for cleaning the ash chamber, hopper, and other parts.
Practical advice on reducing energy consumption through usage and settings.
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