Buderus Logamatic EMS

Questions and Answers

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lgouldAug 19, 2025
What to do if DHW stays cold with Buderus Network Router?
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  Julia SanchezAug 19, 2025
  If the DHW (Domestic Hot Water) stays cold with your Buderus Network Router, it could be due to several reasons. One possibility is a constant drawing of water or a system leak; in this case, fix any leaks. Another reason could be that the DHW pump is incorrectly connected or defective; check that the DHW pump is working, for example, by carrying out a function test. Also, the sensor might be incorrectly connected, installed, or defective, or there may be a break or short circuit in the sensor lead; in this case, check the sensor connection and lead, ensure the sensor is correctly mounted, and compare resistance values with the characteristic sensor curve.
J
jonesstaceyAug 25, 2025
What to do if my Buderus Network Router has no communication with UBA3/MC10/MCM10?
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  Henry DoughertyAug 25, 2025
  If there is no communication with the UBA3/MC10/MCM10 on your Buderus Network Router, the EMS bus system might be overloaded. Try resetting the system by switching the heating system off and on. If the problem persists, notify customer support. It is also possible that the UBA3/MC10/MCM10 is defective.
S
Shawn YoungAug 26, 2025
How to fix 'No communication with HZx mixer module' on Buderus Network Router?
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  Amy DanielAug 26, 2025
  If your Buderus Network Router has no communication with the HZx mixer module, it could be because the heating zone addresses on the MM10 and RC35 do not match; check the dial on the MM10. Another possibility is that the MM10 or bus cable is incorrectly connected or faulty, or the MM10 is not recognized by the RC35; in this case, check the terminals on the MM10 and the bus cable, and replace the MM10.
R
Rebecca ParksAug 28, 2025
What causes 'No communication with BC10' error on Buderus Network Router?
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  Charles LawrenceAug 28, 2025
  If there is no communication with BC10 on your Buderus Network Router, there may be a contact problem on the BC10, or the BC10 might be faulty. Check the BC10 connection and replace the BC10 if necessary.
T
theresa74Aug 30, 2025
How to troubleshoot 'No communication with LL header module' on Buderus Network Router?
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  Patrick SpencerAug 30, 2025
  If your Buderus Network Router has no communication with the LL header module, the WM10 or bus cable might be incorrectly connected or faulty, or the WM10 may not be recognized by the RC35. Check the terminals on the WM10 and the bus cable. You may also need to replace the WM10.
H
Heather HurleySep 1, 2025
What to do if HZx supply sensor is defective in Buderus Network Router?
- L
  Lisa CrossSep 1, 2025
  If the HZx supply sensor is defective in your Buderus Network Router, it might be due to the sensor being incorrectly connected or installed, a break or short circuit in the sensor lead, or a faulty sensor. Check the sensor connection and the sensor lead, ensure the sensor is correctly mounted, and compare resistance values with the characteristic sensor curve.
D
Deborah SummersSep 4, 2025
How to fix a defective outdoor sensor on my Buderus Network Router?
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  Arthur Mays MDSep 4, 2025
  If the outdoor sensor is defective in your Buderus Network Router, it could be due to the sensor being incorrectly connected or installed, a break or short circuit in the sensor lead, or a defective temperature sensor. Check the sensor connection and the sensor lead, ensure the sensor is correctly mounted, and compare resistance values with the characteristic sensor curve.
J
Justin NicholsSep 6, 2025
What causes DHW sensor 1 to be defective on Buderus Network Router?
- S
  Sue WilsonSep 6, 2025
  If DHW sensor 1 is defective in your Buderus Network Router, it may be due to the sensor being incorrectly connected or installed, a break or short circuit in the sensor lead, or a defective temperature sensor. Check the sensor connection and the sensor lead, ensure the sensor is correctly mounted, and compare resistance values with the characteristic sensor curve.
J
jenniferthomasSep 8, 2025
What to do if room temperature for HZx is defective on Buderus Network Router?
- D
  Debra HuffSep 9, 2025
  If the room temperature for HZx is defective on your Buderus Network Router, the built-in temperature sensor on the RC35 controls/remote control unit might be defective. Replace the remote control unit.
M
Maria OrtizSep 12, 2025
What does 'internal error' mean on my Buderus Network Router?
- P
  Pamela KelleySep 12, 2025
  If your Buderus Network Router displays an internal error, it indicates an internal runtime error in the RC35. Replace the RC35.

Summary

Explanation of Symbols and Safety Instructions

Explanation of Symbols and Warnings

Details warning symbols, signal words, and important information icons.

Installation and Use Safety Guidelines

Covers safety during installation, operation, risk of electric shock, scalding, and device damage.

Product Description

Intended Use and System Compatibility

Describes the RC35 control unit's intended application and compatibility with Buderus heating systems.

Technical Specifications

Provides electrical, dimensional, operating, and temperature sensor resistance specifications.

Package Contents

Lists the items included in the RC35 package: user interface, instructions, and mounting kit.

Installation

Installation Location Selection

Provides requirements for installing the RC35 in a reference room or on a boiler.

Mounting and Wiring Connections

Details the process of attaching the wall bracket and connecting the bus cable to the RC35.

Attaching and Detaching the User Interface

Explains the steps for physically mounting the RC35 onto its wall bracket and removing it.

Operating Basics

RC35 Operation Overview

Explains the display, dial, and basic/additional function buttons of the RC35.

Navigating the Service Menu

Guides users on how to access and operate the Service menu for system parameter adjustments.

Service Menu Structure

Details the menus, submenus, and their corresponding functions within the Service menu.

Commissioning

General Commissioning Steps

Outlines the initial steps for commissioning the RC35, including setting language, date, and time.

Commissioning Checklist for Key Parameters

Provides a checklist of important parameters and their settings for system commissioning.

System Commissioning and Handover

Covers final checks, setting boiler controller to "Aut", and explaining operation to the customer.

Entering System Settings

System Data Configuration

Settings for language, units, time/date format, and module installation.

Heating Zone Data Configuration

Settings for activating zones, interfaces, control modes, and systems.

Frost Protection Settings

Options for frost protection, including temperature and room-based triggers.

Domestic Hot Water (DHW) Settings

DHW tank, temperature, and recirculation settings.

Diagnosis

Component Function Testing

Explains how to perform functional tests on individual EMS components.

Monitoring System Values

Describes how to view target and actual values for various heating system components.

Error Message Investigation

Details how to view recent faults, their categories, and system behavior during errors.

Service

Service Interval and Message Management

Covers setting service intervals, viewing, and resetting service messages.

Reset

Resetting System Parameters

Explains how to reset parameters to factory settings, clear fault lists, and reset run time.

Troubleshooting

Troubleshooting Faults and Error Codes

Lists system errors, fault codes, their effects, causes, and remedies.

Service Menu RC35

RC35 Service Menu Flowchart

Provides a flowchart illustrating the navigation paths within the RC35 Service Menu.