What does error code C5 mean on a Viessmann Boiler?
If your Viessmann Boiler displays error code C5, it indicates a communication error with the variable speed internal pump. To resolve this, check the setting of coding address "30".
Why is my Viessmann Boiler showing error code C6?
If your Viessmann Boiler is showing error code C6, it indicates a communication error with the external variable speed heating circuit pump for heating circuit 2 (with mixer). To resolve this, check the setting of coding address "E5".
What does error code C7 mean on my Viessmann B2TB004?
If your Viessmann Boiler displays error code C7, it indicates a communication error with the external variable speed heating circuit pump, heating circuit 1 (without mixer). To resolve this, check the setting of coding address "E5".
What does error code Cd mean on a Viessmann B2TB004?
If your Viessmann Boiler displays error code Cd, it indicates a communication error with Vitocom 100 (KM BUS). To resolve this, check connections, Vitocom 100 and coding address "95".
What should I do if my Viessmann Boiler displays error code CE?
If your Viessmann Boiler displays error code CE, it indicates a communication error with the ext. extension. To resolve this, check connections and coding address "2E".
What does error code CF mean on my Viessmann B2TB004?
If your Viessmann Boiler displays error code CF, it indicates a communication error with the LON communication module. To resolve this, replace the LON communication module.
What does error code bF mean on a Viessmann Boiler?
If your Viessmann Boiler displays error code bF, it indicates an incorrect LON communication module. To fix this, replace the LON communication module.
What does error code 0F mean on my Viessmann B2TB004?
If your Viessmann Boiler displays the error code 0F, it indicates that maintenance is required. Service the appliance and after servicing, set coding address "24:0".
What does error code A7 mean on my Viessmann B2TB004?
If your Viessmann Boiler displays error code A7, it indicates a faulty programming unit. To resolve this, replace the programming unit.
What does error code E4 mean on my Viessmann B2TB004 Boiler?
If your Viessmann Boiler displays error code E4, it indicates a fault in the supply voltage of 24 V. To resolve this, replace the control unit.
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