Wolf CGB-2-24 User Manual

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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

Other manuals for Wolf CGB-2-24

Replacement Instructions20 pages

Questions and Answers:

D
David ParkerSep 7, 2025
Why calibration factory limit not reached on Wolf Boiler?
- P
  perezkyleSep 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.
S
Steven BlakeAug 23, 2025
What to do if there is flame failure in Wolf Boiler?
- M
  Michael CraigAug 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.
J
Jerry CookAug 25, 2025
How to fix HLSC excess temp on Wolf Boiler?
- C
  christinebushAug 26, 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
bill14Aug 26, 2025
What to do if TL excess temp on Wolf CGB-2-24?
- D
  Dalton LaneAug 26, 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.
T
Travis KentAug 27, 2025
What to do if boiler sensor is faulty in Wolf Boiler?
- B
  Brittany WilkersonAug 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.
B
Brandon VaughnAug 29, 2025
How to fix eHLSC sensor faulty on Wolf Boiler?
- M
  Matthew DorseyAug 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.
R
ramoskevinSep 12, 2025
How to fix dt flow drift on Wolf CGB-2-24?
- A
  Andrea WarrenSep 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.
S
Sheila VasquezSep 8, 2025
Why is there calibration discrepancy on Wolf CGB-2-24 Boiler?
- R
  rpaulSep 8, 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.
K
Kenneth LloydSep 6, 2025
Why is fan speed high on Wolf CGB-2-24 Boiler?
- E
  Elijah YoungSep 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.
D
Daniel WeberSep 3, 2025
What to do if outside sensor is faulty in Wolf CGB-2-24?
- G
  Gregory SantiagoSep 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-2-24 Specifications

General

Type	Condensing Boiler
Max. Heat Output (80/60 °C)	24 kW
Efficiency (80/60 °C)	98%
NOx Class	5
Vent Diameter	80/125 mm
Fuel Type	Natural Gas

Summary

Safety Instructions and Warnings

Gas, Flue Gas, and Electrical Hazards

Emergency steps for gas/flue gas smells and electrical component risks.

Water Pressure and Burn Hazards

Warnings about high water pressure and hot components.

System Working and Inspection Procedures

Safety procedures when working on the system and inspection recommendations.

Technical Specifications

Gas/Air Mixture Control and Calibration

Gas-Adaptive Combustion Control Principle

Calibration Process

Gas Connection and Supply Pressure

Gas Connection Instructions

Instructions for connecting the gas supply line, including safety warnings.

Checking Gas Supply Pressure

Steps for checking the gas supply pressure, including safety warnings.

Electrical Connection

General Electrical Connection Guidance

Internal Control Unit Wiring

Parameter Configuration

HG Control Parameters Overview

Key Parameter Descriptions

Filling and Draining the System

Heating Water Treatment and Filling

Guidelines for heating water treatment and system filling procedures.

Draining the Heating System

Step-by-step instructions for draining the heating system.

Gas Type and Combustion Checks

Determining and Changing Gas Type

Steps to identify, change, and record the correct gas type.

Checking Combustion Parameters

Boiler Conversion and Pump Function

Boiler Conversion Procedures

Troubleshooting and Faults

General Troubleshooting Guidance

Fault and Warning Code Resolution

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