What does fault code dE mean on Viessmann Boiler?
If your Viessmann Boiler displays fault code dE, it indicates a lead break in the room temperature sensor, heating circuit 2 (with mixer). Check room temperature sensor for heating circuit 2 and remote control settings.
Why is my Viessmann Boiler displaying fault code dd?
If your Viessmann Boiler displays fault code dd, it indicates a lead break in the room temperature sensor, heating circuit 1 (without mixer). Check room temperature sensor for heating circuit 1 and remote control settings.
How to troubleshoot fault code dC on a Viessmann B2TF?
If your Viessmann Boiler displays fault code dC, it indicates a short circuit in the room temperature sensor, heating circuit 3 (with mixer). Check room temperature sensor, heating circuit 3.
What does fault code db mean on a Viessmann B2TF?
If your Viessmann Boiler displays fault code db, it indicates a short circuit in the room temperature sensor, heating circuit 2 (with mixer). Check room temperature sensor, heating circuit 2.
What should I do if my Viessmann B2TF shows fault code dA?
If your Viessmann Boiler displays fault code dA, it indicates a short circuit in the room temperature sensor, heating circuit 1 (without mixer). Check room temperature sensor, heating circuit 1.
How to resolve fault code d8 on a Viessmann Boiler?
If your Viessmann Boiler displays fault code d8, it means Input DE3 reports a fault at extension EA1. Remove fault at the appliance concerned.
What does fault code d7 mean on my Viessmann Boiler?
If your Viessmann Boiler displays fault code d7, it means Input DE2 reports a fault at extension EA1. Remove fault at the appliance concerned.
What does fault code d6 mean on a Viessmann B2TF?
If your Viessmann Boiler displays fault code d6, it means Input DE1 reports a fault at extension EA1. Remove fault at the appliance concerned.
How to fix fault code CF on Viessmann Boiler?
If your Viessmann Boiler displays fault code CF, it indicates a communication error with the LON communication module. Replace the LON communication module.
What does fault code CE mean on my Viessmann B2TF?
If your Viessmann Boiler displays fault code CE, it indicates a communication error with ext. extension. Check electrical connections.
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