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General| Type | Combination Boiler |
|---|---|
| Output | 24 kW |
| Mounting | Wall Mounted |
| Central Heating Output (kW) | 24 kW |
| Domestic Hot Water Output (kW) | 24 kW |
| Ignition | Electronic |
| Fuel Type | LPG |
Section provides guidance on common boiler problems and solutions.
Lists the key electrical components of the boiler system.
Explains the logic program for central heating operation.
Details the boiler's built-in self-diagnostic fault finding system.
Flow charts for diagnosing self-diagnostic faults.
Addresses issues like gas regulators, water filters, and connections.
Explains faults in mixer valves affecting hot water flow.
A method to eliminate plumbing faults from mixer valves or crossed pipes.
Details on mains water pressure/flow rate affecting boiler operation.
Focuses on room thermostat and low pressure issues in CH.
Checks the time clock settings for heating demand activation.
Diagnoses slow radiator heating, often due to filter blockages.
Identifies cold radiators usually due to crossed pipe work.
Lists essential checks before making any adjustments to the boiler.
Verifies connections of solenoid wires, spark generator, and HT leads.
Guides to ignition sequences, flow diagrams, and diagnostics.
Diagrams to help diagnose non-safety related boiler problems.
Contains detailed specifications for model, category, and performance.
Details heat input, water flow rates, and operating pressures.
Provides physical dimensions, clearances, and gas specifications.
Visual representation of the boiler's hydraulic system with component labels.
Diagram illustrating the boiler's electrical layout and connections.
Information on the electrical filter, mains connection, and earth points.
Details on the fan's power and the circulation pump's function.
Specifics on the CH pump's operation and frost protection.
Photo diagram identifying components on the printed circuit board.
Wiring details for the electrical filter and mains supply connection.
Specifies earth connection points and fan power supply.
Describes pump operation modes including frost protection.
Explains the spark generator's role and removal procedure.
Details on gas valve solenoids, energisation, and replacement.
Outlines PCB functions, resistance, and voltage readings.
Describes the operation of the 3-way valve microswitch.
Explains the air pressure switch role in combustion airflow.
Procedures for checking venturi operation and pressure differentials.
Location and voltage supply for the room thermostat connector.
Details the function and electrical values of the modulating gas solenoid.
Explains the ionisation electrode's role in detecting burner flame.
Describes the high limit thermostat and its reset procedure.
Details the DHW thermistor's role and fault indications.
Methods for checking DHW thermistor voltage and resistance.
Covers CH thermistor location, function, and temperature range.
Explains the CH low pressure switch and its fault codes.
Describes the meaning of the green and red LED status indicators.
Details different time clock types and switch settings.
Crucial warnings about incorrect PCBs and how to identify the correct one.
Overview of PCB operation, testing procedures, and safety precautions.
Guides for safely checking PCB voltages and individual components.
Differentiating fault types and understanding demand inputs.
Conditions necessary for the boiler ignition sequence to commence.
Explains PCB voltage variability and types.
Describes how external controls signal the PCB for operation.
Details the boiler's behaviour during the first 30 seconds of heating.
Explains how modulation adapts to the heating system's load.
How the boiler responds when a low heating load is detected.
Notes on restrictions regarding overriding the logic program.
Illustrates central heating output over time.
Another graphical representation of heating output.
Details various lockout scenarios and their durations.
Flow for demand initiation and pressure checks.
Role of air pressure switch and fan in ignition.
Sequence for ignition, spark generation, and green light indication.
Explains the boiler's regulation and modulation phases.
Initiating DHW demand and performing prerequisite checks.
Process for maintaining selected DHW temperature.
Conditions leading to lockout due to excessive DHW temperature.
Initiating CH demand and checking thermostat status.
Process for maintaining selected CH temperature.
Conditions leading to lockout due to excessive CH temperature.
Explains the boiler's built-in fault detection and lockout system.
Details how to identify faults via LED sequences and their structure.
Lists all fault codes with their corresponding causes and flash sequences.
Explains causes and sequences for ignition failures (Fault 0).
Explains causes and sequences for air pressure switch faults (Fault 1).
Explains causes and sequences for low CH pressure faults (Fault 2).
Explains causes and sequences for high limit thermostat faults (Fault 3).
Explains causes and sequences for PCB failures (Fault 4).
Explains causes and sequences for flame supervision faults (Fault 5).
Explains causes and sequences for water overheating (Fault 6).
Explains causes and sequences for control panel faults (Fault 7).
Explains causes and sequences for gas valve circuit faults (Fault 9).
Explains causes and sequences for DHW thermistor faults (Fault 10).
Explains causes and sequences for CH thermistor faults (Fault 12).
Overall flowchart for diagnosing various boiler operational issues.
Steps to diagnose issues when the green LED is not displayed.
Steps for diagnosing heating failure when hot water functions.
Steps for diagnosing DHW failure when central heating functions.
Diagnostic steps for when the fan or pump fails to operate.
Diagnosing issues when the fan works but no spark is generated.
Steps to diagnose flame failure after successful ignition.
Diagnosing and correcting issues with boiler modulation.
Methods for identifying and resolving different types of boiler noise.
Steps required to change the boiler's gas type.
Guides for adjusting maximum, ignition, and minimum burner pressures.
Provides a chart for burner pressures and figures for gas valve components.
Identifies adjustment points P1, P2, and P3 on the PCB.
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