What does 'No plant error' mean on my Buderus Control Unit?
If your Buderus Control Unit displays 'No plant error', it can indicate that maintenance is required, such as a service interval that has expired. See boiler documentation.
Why was the thermal disinfection unsuccessful on my Buderus Control Unit?
If thermal disinfection was unsuccessful on your Buderus Control Unit, it might be because the water draw was too great during the disinfection period. Select a time for thermal disinfection when there is no other demand for heat.
What to do if my Buderus Control Unit DHW stays cold?
If the DHW (domestic hot water) stays cold, it may be due to a constant drawing of water or a system leak. To resolve this, fix any leaks in your system.
What to do if the Buderus Control Unit shows a low battery for wireless operating unit HCx?
If your Buderus Control Unit displays a low battery warning for the wireless operating unit HCx, the battery in the RC20RF for HCx is low. Replace the batteries to resolve this issue.
Why is my Buderus Control Unit not communicating with RC35?
If there is no communication between your Buderus Control Unit and the RC35, it could be due to a couple of reasons. First, the RC20/RF may have an incorrect address, so check the address (parameter P1) in RC20/RF. Second, the RC35 might not be installed or correctly connected, so check the RC35 connection.
What does 'Frost prot. selected but no rem.contr. HCx' mean on my Buderus Control Unit?
If your Buderus Control Unit shows 'Frost prot. selected but no rem.contr. HCx', it means that no programming unit / remote control unit is assigned, even though frost protection is set to room temperature. Check the operating unit parameter and change frost protection to outside temperature if necessary.
What causes no communication with operating unit HCx on my Buderus Control Unit?
If there is no communication with operating unit HCx on your Buderus Control Unit, it could be because the RC20 has an incorrect address, is incorrectly wired, or is faulty, or the heating circuit has not been registered on the RFM20. Check the address in the RC20, check the function and connection of the remote control unit, and replace the remote control unit if necessary.
What does 'Internal error' mean on my Buderus Control Unit?
If your Buderus Control Unit displays an 'Internal error', it indicates an internal runtime error in the RC35. Replace the RC35 to resolve this issue.
What causes an outside sensor defect in my Buderus Control Unit?
An outside sensor defect in your Buderus Control Unit can be caused by a few things. The sensor might be incorrectly connected or installed, there could be a break or short circuit in the sensor lead, or the sensor itself may be faulty. Check the sensor connection and the sensor lead. Ensure the sensor is correctly mounted and compare resistance values with the sensor characteristic curve.
What does it mean when my Buderus Control Unit says 'Two master operating units in system'?
If your Buderus Control Unit displays 'Two master operating units in system', it means that both the RC20 and RC35 are registered as master units. To fix this, change parameter P1 in RC20 or remove RC35 from the EMS bus.
Details warning symbols, signal words, and additional symbols used.
Provides crucial safety guidelines for installation, operation, and potential hazards.
Describes how to activate different operating modes (automatic, manual).
Explains how to set permanent day and night room temperatures.
Setting operating modes for RC35 and other heating circuits.
How to set heating schedules for day/night modes.
Addresses common questions about system behavior and measurements.
Explains different types of messages displayed by the unit.
Procedures for resetting system faults and locking issues.
General| Display | LCD |
|---|---|
| Temperature Control | Yes |
| Weather Compensation | Yes |
| Communication | EMS Bus |
| Mounting | Wall-mounted |
| Voltage | 24 V |
| Temperature range | 5°C to 30°C |
| Accuracy | ±0.5°C |
| Protection class | IP20 |
| Weight | 0.3 kg |
| Power consumption | 2 W |
| Switching current | Not applicable |
| Ambient temperature | 0°C to 45°C |
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