Wolf CGB-2K-20 User Manual (English)

Other manuals for Wolf CGB-2K-20

Questions and Answers:

J
Joshua OchoaSep 7, 2025
Why calibration factory limit not reached on Wolf CGB-2K-20 Boiler?
- B
  brianwilsonSep 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.
J
Jessica HernandezAug 23, 2025
What to do if there is flame failure in Wolf CGB-2K-20 Boiler?
- G
  Gregory DawsonAug 23, 2025
  If the Wolf Boiler shows a 'Flame failure' error, it could be due to several reasons. First, verify the gas type setting on both the gas valve and the AM/BM. Then, check the gas supply pressure. Inspect the condition of the ionization electrode, cleaning or replacing it if necessary, and ensure its gap and position are correctly set. Finally, examine the flue path inside and outside the appliance for any leaks or blockages.
K
Karen JonesAug 25, 2025
How to fix HLSC excess temp on Wolf Boiler?
- A
  Ashley AliAug 25, 2025
  If your Wolf Boiler displays 'HLSC excess temp,' it indicates that the temperature at the heat exchanger cover has exceeded 185 °C. Check the cables and plugs connected to the high limit safety cut-out (HLSC). If the electrical connections are fine but there's still no function, replace the HLSC. Another possible cause is a contaminated combustion chamber, in which case, clean or replace the combustion chamber.
B
Bobby HicksAug 26, 2025
What to do if TL excess temp on Wolf Boiler?
- M
  Mark JacksonAug 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.
C
corey33Aug 27, 2025
What to do if boiler sensor is faulty in Wolf Boiler?
- T
  Tyler FrancisAug 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.
A
austin18Aug 28, 2025
How to fix eHLSC sensor faulty on Wolf CGB-2K-20?
- R
  Robin FoxAug 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.
J
James GrahamSep 13, 2025
How to fix dt flow drift on Wolf Boiler?
- D
  Diana WalkerSep 13, 2025
  If your Wolf Boiler displays 'dt flow drift', it means the temperature differential between temperature sensors eHLSC1 and eHLSC2 is greater than 6 °C at the combustion chamber. The eHLSC may be faulty, so replace it.
D
Daniel SmithSep 9, 2025
Why is there calibration discrepancy on Wolf Boiler?
- E
  Eugene RiveraSep 9, 2025
  If your Wolf Boiler shows 'Calibration discrepancy', it could be due to several reasons. One possibility is a corroded or bent ionization electrode, so check its condition and clean or replace if necessary. Another cause could be soot or dirt particles in the intake air, especially in room-sealed operation. Also, check for flue gas recirculation issues by inspecting the flue path inside and outside the appliance for leaks or blockages. Lastly, a wiring error on the HCM-2 (low voltage side) could be the cause, so check the electrical connection of the HCM-2 low voltage side.
P
pcarsonSep 6, 2025
Why is fan speed high on Wolf Boiler?
- C
  Connor DennisSep 6, 2025
  If the Wolf Boiler displays 'Fan speed >', it means the fan does not stop. Check the fan's cables, plug-in connections, power supply, and switching. If the fault occurs repeatedly, replace the fan.
J
Jared MurphySep 3, 2025
What to do if outside sensor is faulty in Wolf CGB-2K-20?
- T
  Terri BriggsSep 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.

Wolf CGB-2K-20 Specifications

General

Type	Condensing boiler
Nominal heat output 50/30 °C	20 kW
Efficiency 50/30°C	109%
Efficiency 80/60°C	98%
Dimensions Width	440 mm
Heating Capacity	20 kW
Fuel Type	Natural gas
Operating Pressure	3 bar

Summary

Installation Instructions for Contractors

Wall Mounted Gas Condensing Boiler

Covers installation for CGB-2 and CGB-2K models.

Information on Documentation and Standard Delivery

Instructing the System User

Guidance on user training for operation, maintenance, and safety.

Safety Instructions

Gas Leak Safety Precautions

Steps to take if gas or flue gas smell is detected.

Electrical Safety Warnings

Warnings about electrical hazards and live components.

Thermal Hazard Warnings

Precautions regarding hot water and components (scalding, burns).

Working on the System Safely

Safety steps before working on the appliance.

Dimensions and Technical Drawings

CGB-2 Dimensions

Technical drawing showing dimensions for CGB-2.

CGB-2K Dimensions

Technical drawing showing dimensions for CGB-2K.

Technical Specifications

Product Specifications Table

Detailed technical data for different models.

Component Layout Diagrams

CGB-2 Component Layout

Diagram showing component layout for CGB-2.

CGB-2K Component Layout

Diagram showing component layout for CGB-2K.

Electronic Gas/Air Mixture Control

Gas-Adaptive Combustion Control Principle

Explains how the system controls combustion.

System Calibration Procedure

Details on how and when the system calibrates.

Casing and Access

Opening the Front Casing

Step-by-step guide to access the casing.

Standards and Regulations Compliance

Local Installation Regulations

Lists local compliance requirements for installation.

General Regulations and Guidelines

Lists applicable standards and guidelines.

DHW Temperature and Scale Prevention

Guidance on DHW temperature settings to prevent scale.

Installation Positioning and Clearances

Minimum Clearances

Specifies required space around the boiler.

Installation Room Requirements

Conditions for the installation room (frost, temp., chemicals).

Installation Dimensions and Connections

Boiler Mounting and Connection Points

Diagrams showing dimensions and connection layouts.

Securing Appliance with Suspension Bracket

Steps for mounting the boiler using a bracket.

Installation of Supply Lines

Heating Circuit Connections

Details on installing maintenance valves and dirt traps.

Gas Connection Procedures

Air and Flue Gas Routing

Electrical Connection Requirements

General Electrical Safety

Warnings and requirements for electrical work.

Control Unit Terminal Connections

Detailed breakdown of terminal connections.

230 V Mains Connection

Steps for connecting the main power supply.

Flue Gas Damper/Ventilation Air Damper Connection

Boiler Operating Modes and Status

Boiler Operating Modes

Explains different operating modes shown on display.

Boiler Burner Status Indicators

Explains various burner status messages.

Control Parameters (HG Settings)

Control Parameter Table

List of control parameters with factory settings.

Parameter Descriptions

Filling the Heating System and Trap

Leak Test and Water Treatment

Requirements for leak testing and water treatment.

Filling the Heating System Procedure

Step-by-step instructions for filling the system.

Determining and Changing Gas Type

Changing Gas Type for LPG Operation

Procedure to switch to LPG operation.

Checking Gas Supply Pressure

Gas Pressure Check Procedure

Steps to measure gas supply pressure.

Adjusting Maximum Heating Output

Output Setting (Parameter HG04)

How to adjust output via parameter HG04.

Checking Combustion Parameters

Converting Between Combi and Cylinder Boiler

Combi Boiler to Boiler with Cylinder Conversion

Steps for converting combi to cylinder boiler.

Boiler with Cylinder to Combi Boiler Conversion

Steps for converting cylinder boiler to combi.

Setting the Flow Limiter

Adjustable Flow Limiter (DHW)

How to adjust the DHW draw-off rate.

Commissioning Report

Commissioning Steps Checklist

Checklist for commissioning steps.

Commissioning Checklist Continued

Continuation of the commissioning checklist.

Boiler Safety Devices

Air/Flue Gas Routing Technical Information

Flue Gas Routing Options and Lengths

Table of routing options and max lengths.

Tightness Test on Adjacent Appliances

Procedure for tightness testing cascade systems.

Testing the First CGB-2 for Tightness

Specific tightness test procedure for CGB-2.

Underfloor Heating and DHW Circulation

Underfloor Heating System Requirements

Notes on connecting underfloor heating systems.

System Reset Procedures

Parameter Reset to Factory Settings

Steps to perform a parameter reset.

Troubleshooting Guide

General Troubleshooting Information

General advice on dealing with faults and warnings.

Procedure for Faults

Steps to follow when a fault occurs.