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Wolf CGB-2 Series - User Manual

Wolf CGB-2 Series
108 pages
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GB
IE
WOLF GMBH / POSTFACH 1380 / D-84048 MAINBURG / TEL. +49.0.875174-0 / FAX +49.0.875174-1600 / www.WOLF.eu
Art.-Nr.: 3064810_201804 Subjecttotechnicalmodications
Installationinstructionsforcontractors
Wall mounted gas condensing boiler
CGB-2 wall mounted gas condensing boiler
CGB-2K wall mounted gas condensing combi boiler
CGB-2-14
CGB-2(K)-20
CGB-2(K)-24

Table of Contents

Questions and Answers

  • N
    Nicholas SanchezSep 7, 2025
    Why calibration factory limit not reached on Wolf Boiler?
    • M
      moyerkennethSep 7, 2025
      If your Wolf Boiler displays 'Calibration factory limit' and the minimum limit was not reached, it could be due to flue gas recirculation issues. Check the flue path inside and outside the appliance for any leaks or blockages. Additionally, have customer service set the IO default value to the factory setting. Another possible cause is a corroded or bent ionization electrode, so check its condition and clean or replace it if necessary. Lastly, a wiring error on the HCM-2 (low voltage side) could be the culprit, so check the electrical connection of the HCM-2 low voltage side.
  • T
    Tammy HinesAug 22, 2025
    What to do if no flame is established in Wolf Boiler?
    • E
      Eric GrayAug 22, 2025
      If the Wolf Boiler displays 'No flame established', it could be due to several reasons. First, ensure the gas supply is properly connected and the gas valve is open. Next, inspect the ionization electrode for its position and condition, adjusting or replacing it if needed. Also, check the position of the ignition electrode and adjust if necessary, along with examining the ignition transformer and wiring. Verify that the HG44 curves are set to the standard value. Finally, check that the gas valve opens; if it doesn't, check the cables and plugs and repeat the test. If the gas valve is faulty, replace it.
  • H
    Haley GlassSep 4, 2025
    Why is fan speed low on Wolf CGB-2?
    • S
      Sherri WestSep 5, 2025
      If your Wolf Boiler displays 'Fan speed
  • L
    lisa57Sep 3, 2025
    What to do if outside sensor is faulty in Wolf CGB-2 Boiler?
    • A
      Albert MillerSep 3, 2025
      If your Wolf Boiler displays 'Outside sensor faulty,' it means that the outside sensor or sensor lead has a short circuit or break. For the eBus outside temperature sensor, refer to its instructions. Similarly, for a wireless outside sensor, consult its specific instructions.
  • G
    gene20Sep 2, 2025
    What to do if return sensor is faulty in Wolf Boiler?
    • M
      Margaret BakerSep 2, 2025
      If your Wolf Boiler displays 'Return sensor faulty', it indicates that the return sensor or sensor lead has a short circuit or break, or the return sensor temperature is above 100 °C. Check the leads and plug-in connections of the return sensor. If they are OK and there is still no function, replace the return sensor.
  • J
    jenniferdaughertyAug 31, 2025
    What to do if DHW sensor is faulty in Wolf CGB-2 Boiler?
    • K
      Kathryn SheltonAug 31, 2025
      If your Wolf Boiler shows 'DHW sensor faulty', it means that the DHW sensor (cylinder sensor) or sensor lead has a short circuit or break, or the DHW-sensor temperature is above 99 °C. Check the leads and plug-in connections of the DHW temperature sensor. If they are OK, replace the sensor.
  • E
    Eric RiddleAug 30, 2025
    What to do if flue gas sensor is faulty in Wolf CGB-2?
    • R
      Richard CarrAug 30, 2025
      If your Wolf Boiler displays 'Flue gas sensor faulty,' it indicates that the flue gas sensor or sensor lead has a short circuit or break. Check the leads and plug-in connections of the flue gas temperature sensor. If the electrical connection is OK but there is no function, replace the sensor.
  • N
    Nicolas BaileyAug 29, 2025
    How to fix eHLSC sensor faulty on Wolf CGB-2 Boiler?
    • T
      timothy83Aug 29, 2025
      If your Wolf Boiler indicates 'eHLSC sensor faulty', it means that the temperature sensor eHLSC1, eHLSC2 on the combustion chamber or sensor lead has a short circuit or break. Check the leads and plug-in connections on the eHLSC on the combustion chamber. If the electrical connection is OK but there's no function, replace the eHLSC.
  • B
    Bailey GrimesAug 27, 2025
    What to do if boiler sensor is faulty in Wolf Boiler?
    • M
      Mr. Patrick SmithAug 27, 2025
      If your Wolf Boiler displays the message 'Boiler sensor faulty' it could be due to excess temperature in the flow (Boiler sensor > 100 °C). First, check if the pump is running. If it is not, check the cables and plugs and if the electrical connection is OK but there is still no function, replace the pump. Another solution is to increase the minimum pump speed. Also, check the leads and plug-in connections of the boiler sensor, and if they are OK but there is still no function, replace the boiler sensor.
  • J
    Jeffrey RodriguezAug 26, 2025
    What to do if TL excess temp on Wolf CGB-2?
    • T
      tmooreAug 27, 2025
      If your Wolf Boiler shows a 'TL excess temp' error, it means one of the temperature sensors eHLSC1 or eHLSC2 on the combustion chamber has exceeded the high limit safety cut-out limit (108 °C). Check the system pressure and vent the heating circuit. Inspect the cables and plugs of the temperature limiter (eHLSC), and if they are OK but there's no function, replace the eHLSC. Also, check if the pump is running; if not, check its cables and plugs, and if the electrical connection is OK but it's still not working, replace the pump.

Summary

Information on Documentation and Standard Delivery

Safekeeping of Documents

Ensures safekeeping of all instruction manuals and documents.

Instructing the System User

Provides guidance on boiler operation, maintenance, and safety to the user.

Standard Delivery Contents and Accessories

Lists items included with the boiler and necessary accessories for installation.

Safety Instructions

Critical Safety Warnings

Covers gas leaks, flue gas, electrical hazards, scalding, and burns.

System Safety and Maintenance Precautions

Safety measures for working on the system and requirements for inspection and service.

Dimensions and Layout

Appliance Dimensions and Component Layout

Technical drawings showing boiler dimensions and internal component arrangement.

Technical Specifications

Boiler Specification Data

Detailed technical data including output, efficiency, and connections.

Electronic Gas;Air Mixture Control

Combustion Control Principle and Calibration

Explains gas-adaptive control and the system calibration process.

Casing and Installation Positioning

Casing Removal and Boiler Positioning

Instructions for casing removal, minimum clearances, and installation environment.

Installation Procedures

Appliance Mounting and Supply Line Connections

Covers boiler mounting, and connecting supply lines for different wall types.

System Connections: Gas, Heating, DHW

Details gas, heating circuit, safety valve, and cold water/DHW connections.

Air;Flue Gas Routing

Instructions and considerations for routing air and flue gas systems.

Electrical Connection

General Electrical Connection and Safety

Essential information on electrical connection, safety rules, and control unit overview.

Power Supply, Outputs, Inputs, and Sensors

Guidance on connecting power, outputs, inputs, sensors, and accessories.

Display and Programming Modules

Module Installation, Removal, and Overview

Procedures for installing, removing, and understanding AM/BM-2 modules.

Module Functions and Menu Structures

Explanations of module features, keys, and menu navigation.

Parameter Configuration

HG Control Parameters and System Configurations

Overview of control parameters, system configurations, and modification guidelines.

Detailed Parameter Descriptions

Explanations of various control parameters (HG01-HG61) and their functions.

System Filling and Commissioning

Heating System Filling, Water Treatment, and Draining

Procedures for filling, water treatment, draining the heating system, and trap filling.

Commissioning Steps Checklist

A checklist of essential steps to confirm during boiler commissioning.

Gas Type and Pressure Checks

Gas Type Determination and LPG Operation

Process for determining, changing, and configuring the gas type.

Gas Supply Pressure Check

Procedure for verifying the gas supply pressure for safe operation.

Output and Combustion Adjustment

Adjusting Maximum Heating Output

Method for matching maximum heating output using fan speed settings.

Combustion Parameter Checks

Procedures for checking intake air and flue gas parameters for optimal combustion.

Boiler Conversion and Flow Control

Boiler Conversion Procedures

Steps for converting between combi boiler and boiler with cylinder configurations.

Setting the DHW Flow Limiter

Guide on adjusting the flow limiter for the domestic hot water draw-off rate.

Pump Function and Troubleshooting

High Efficiency Pump Function Description and Settings

Explanation of the modulating heating circuit pump's operating modes and settings.

Safety Devices and Technical Information

Safety Devices Overview

Description of the various safety sensors and monitoring systems in the boiler.

Air;Flue Gas Routing and Connections

Technical data, routing options, connection types, and safety for air/flue gas systems.

Reset and Wiring Diagrams

Parameter Reset Procedure

Steps to reset all parameters to factory default settings.

Wiring Diagrams (HCM-2 and GBC-e)

Schematics illustrating the wiring connections for the control modules.

Troubleshooting

General Troubleshooting Procedures

Basic principles, fault/warning message interpretation, and resolution steps.

Fault Code Troubleshooting

Detailed list of fault codes, possible causes, and remedies for appliance issues.

Warning Message Troubleshooting

Guide to interpreting warning messages, their causes, and necessary actions.

Regulatory Information

Product Fiche and EU Regulations

Regulatory product fiche and technical parameters compliant with EU regulations.

EU Declaration of Conformity

Manufacturer's declaration confirming product compliance with relevant EU directives.

Wolf CGB-2 Series Specifications

General IconGeneral
Efficiency (GCV)Up to 98%
Efficiency (AFUE)Up to 95%
TypeCondensing Boiler
Fuel TypeNatural Gas or Propane
DimensionsVaries by model
WeightVaries by model

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