Ideal Logic Combi 35 User Manual: Article Plan
This manual serves as a comprehensive guide for operating your Ideal Logic Combi 35. It details installation, safety, troubleshooting, and maintenance, ensuring optimal performance and longevity.
Welcome to the world of efficient home heating and hot water! The Ideal Logic Combi 35 is a highly efficient condensing combination boiler designed to provide both central heating and on-demand hot water for your home. This user manual is crafted to guide you through every aspect of your boiler’s operation, from initial setup to routine maintenance, ensuring years of reliable service.
This boiler represents a significant advancement in home comfort technology, offering a compact design and user-friendly controls. Whether you’re a homeowner or a heating professional, this manual will provide valuable insights into maximizing the boiler’s performance and understanding its features. It’s crucial to retain this manual for future reference, as it contains essential information regarding safety precautions, troubleshooting, and warranty details.

The Ideal Logic Combi 35 is engineered for ease of use and installation, aligning with modern demands for energy efficiency and environmental responsibility. Join the growing community of satisfied users and unlock the full potential of your new heating system!
Understanding Key Features and Benefits
The Ideal Logic Combi 35 boasts a range of features designed for optimal performance and user convenience. Its compact design allows for flexible installation in various home environments, saving valuable space. The high efficiency condensing technology minimizes gas consumption, leading to lower heating bills and a reduced carbon footprint – aligning with EU directives for environmental protection.
Key benefits include on-demand hot water, eliminating the need for a separate hot water storage cylinder. The boiler’s modulating output automatically adjusts to your heating demands, ensuring consistent comfort and energy savings. The user-friendly control panel provides intuitive operation and precise temperature control. Furthermore, compatibility with a wide range of heating controls allows for personalized comfort settings and smart home integration.
This boiler’s robust construction and quality components guarantee long-lasting reliability, backed by a comprehensive warranty for peace of mind. Experience the difference of a modern, efficient, and dependable heating solution!
Safety Precautions and Warnings
Prioritizing safety is paramount when operating the Ideal Logic Combi 35. Always ensure proper ventilation in the boiler room to prevent carbon monoxide buildup – a potentially fatal hazard. Installation must be performed by a qualified and certified Gas Safe registered engineer, adhering to all relevant regulations and standards.
Warning: Do not attempt to repair or modify the boiler yourself. Unauthorized intervention can compromise safety and void the warranty. Regularly inspect flue terminals for blockages, ensuring unobstructed exhaust flow. Never operate the boiler if you suspect a gas leak; immediately contact your gas supplier and a qualified engineer;

Keep flammable materials away from the boiler. Supervise children and vulnerable individuals around the appliance. Be cautious of hot surfaces during and after operation. Familiarize yourself with the location of the emergency shut-off valve and how to use it. Adhering to these precautions ensures safe and reliable operation.

Initial Setup and Installation
Professional installation is crucial for the Ideal Logic Combi 35. A Gas Safe registered engineer will assess your property’s suitability, ensuring correct gas supply and flue configuration. The boiler requires adequate space for ventilation, servicing, and safe access. Correct flue installation is vital to prevent carbon monoxide poisoning – it must be properly sealed and terminate correctly.
Before commissioning, the system must be thoroughly flushed to remove debris and contaminants. The engineer will check gas tightness, water pressure, and electrical connections. System filling with water is essential, followed by bleeding the radiators to eliminate trapped air.
Initial setup involves configuring the boiler’s parameters to match your heating system. This includes setting the central heating flow temperature and hot water temperature. The engineer will demonstrate the control panel’s functionality and explain how to operate the boiler safely and efficiently. Keep the installation and servicing records for future reference.

Control Panel Overview and Functionality

The Ideal Logic Combi 35 features a user-friendly control panel with a clear LCD display and intuitive button layout. The display shows current temperature settings, operating mode, and any error codes. Buttons allow you to adjust heating and hot water temperatures, select operating modes (heating, hot water, or off), and access the timer/schedule settings.
Key functions include the ‘i’ button for information, displaying boiler status and settings. The ‘+’ and ‘-’ buttons adjust temperature levels. The ‘mode’ button cycles through available operating modes. A central power button controls the boiler’s on/off state. The panel also indicates system pressure and alerts you to potential issues.
Familiarize yourself with the control panel’s layout and functions. Refer to the manual for detailed explanations of each button and display indicator. Understanding the control panel is essential for efficient operation and troubleshooting minor issues. Regular checks of the display will help maintain optimal performance.
Operating Modes: Heating
The Ideal Logic Combi 35 offers versatile heating modes to suit your comfort needs. In heating mode, the boiler provides warmth to your radiators or underfloor heating system. You can select a desired room temperature using the control panel, and the boiler will automatically modulate its output to maintain that temperature.
The system supports both constant temperature and weather compensation modes. Constant temperature maintains a set temperature regardless of external conditions. Weather compensation adjusts the heating output based on outside temperature, improving efficiency. The boiler can be programmed to operate on a schedule, allowing you to set different temperatures for different times of the day.
Ensure radiators are bled for optimal heat distribution. Check for any obstructions blocking radiator flow. Proper operation in heating mode ensures a comfortable and energy-efficient home environment. Regularly review your heating schedule to maximize savings.
Operating Modes: Hot Water
The Ideal Logic Combi 35 excels in providing on-demand hot water. When a hot water tap is opened, the boiler instantly fires up to heat water as it flows through the heat exchanger. This ‘combi’ functionality eliminates the need for a separate hot water storage cylinder, saving space and energy.
You can adjust the desired hot water temperature via the control panel, ensuring comfortable washing and bathing. The boiler features a flow rate sensor, which modulates the output to maintain a consistent temperature even with varying water pressure. It’s important to note that multiple simultaneous hot water demands may slightly reduce the flow rate to each outlet.
For optimal performance, ensure the system is properly pressurized. Regularly check for any leaks in the hot water system. Understanding the hot water mode ensures efficient and reliable hot water supply throughout your home.
Programming the Timer and Schedule
The Ideal Logic Combi 35 offers flexible programming options via its intuitive control panel. You can set specific times for the boiler to operate, creating a heating schedule tailored to your lifestyle. This feature maximizes energy efficiency by ensuring the boiler only runs when heat is actually needed.

The timer allows for multiple on/off periods per day, accommodating varying daily routines. You can program different schedules for weekdays and weekends, providing further customization. Access the timer function through the main menu on the control panel, following the on-screen prompts to set the desired times and temperatures.
Remember to save your settings after programming. Regularly review and adjust the schedule as your needs change, optimizing comfort and minimizing energy consumption. A well-programmed timer significantly contributes to lower heating bills and a more sustainable home environment.
Understanding Error Codes and Troubleshooting
The Ideal Logic Combi 35 utilizes error codes to diagnose potential issues, displayed on the control panel. These codes provide valuable clues for troubleshooting, helping you identify and resolve problems efficiently. A comprehensive list of error codes and their corresponding solutions is included in this manual.
Common issues include low water pressure, flame failure, and circulation problems. Before attempting any repairs, consult the error code description to understand the nature of the fault. Simple fixes, like checking the gas supply or resetting the boiler, may resolve minor issues.
For more complex problems, or if you are uncomfortable performing repairs yourself, it’s crucial to contact a qualified heating engineer. Do not attempt to disassemble or repair internal components without professional assistance. Ignoring error codes or attempting improper repairs can lead to further damage or safety hazards.
Boiler Pressure and How to Check It
Maintaining correct boiler pressure is vital for the efficient and safe operation of your Ideal Logic Combi 35. Optimal pressure typically falls between 1 and 1.5 bar (14.5 – 21.7 psi), as indicated on the boiler’s pressure gauge, usually located on the front panel.
To check the pressure, simply glance at the gauge. If the pressure is too low (below 1 bar), the boiler may not function correctly, potentially leading to heating or hot water issues. Conversely, excessively high pressure (above 2.5 bar) can trigger the safety relief valve, releasing water.
If adjustments are needed, refer to the ‘Filling the System with Water’ section of this manual. Regularly monitoring the pressure helps prevent potential problems and ensures consistent performance. Note any significant or frequent pressure drops, as this could indicate a leak within the system requiring professional attention.
Filling the System with Water
If your boiler pressure is low, you’ll need to refill the system with water. Locate the filling loop – typically a flexible hose with valves at both ends – usually found near the boiler. Ensure both valves are initially closed.
Slowly open the valve on the system side (boiler side) and then partially open the mains water valve. Observe the boiler’s pressure gauge. As the pressure rises, gradually close the mains water valve once it reaches between 1 and 1.5 bar. Immediately close the system side valve to prevent over-pressurization.
Bleed any air from the radiators (see ‘Bleeding the Radiators’ section) after refilling. Check for leaks around the filling loop and boiler connections. If you’re uncomfortable with this process, or if the pressure continues to drop, consult a qualified heating engineer. Never over-pressurize the system, as this can damage components.
Bleeding the Radiators
Trapped air in your radiators can prevent efficient heating. To bleed them, you’ll need a radiator key. Start with the radiators furthest from the boiler. Protect the area below the bleed valve with an old cloth to catch any water.

Slowly insert the radiator key into the bleed valve and turn it counter-clockwise. You’ll hear a hissing sound as air escapes. Continue turning until water starts to drip out steadily. Immediately tighten the valve clockwise to prevent further water loss;
Repeat this process for all radiators, working your way back towards the boiler. After bleeding, check the boiler pressure (see ‘Boiler Pressure and How to Check It’) and top up the system if necessary using the filling loop. Regular bleeding ensures optimal heating performance and reduces energy consumption. If issues persist, consult a professional.
Frost Protection Settings
The Ideal Logic Combi 35 features automatic frost protection to prevent damage during cold weather. This system activates when the boiler or pipework temperature drops to around 5°C. The boiler will periodically run, even if there’s no demand for heating or hot water, to maintain a safe temperature.

You can typically adjust the frost protection setting through the control panel, though the range may be limited. It’s crucial not to disable this feature, especially if your property is unoccupied during winter months. Consider additional measures like lagging pipes in unheated areas for enhanced protection.
If a prolonged power outage occurs during freezing conditions, it’s advisable to drain the system to prevent burst pipes. Consult a qualified engineer for assistance with this process. Regularly check your system before winter arrives to ensure optimal frost protection functionality.
Annual Servicing and Maintenance
Regular servicing is vital for maintaining the efficiency and safety of your Ideal Logic Combi 35. It’s strongly recommended to have the boiler serviced annually by a Gas Safe registered engineer. This ensures all components are functioning correctly and identifies potential issues before they escalate.
During a service, the engineer will check for gas leaks, inspect the flue, clean the burner, and assess the overall system performance. They will also examine the boiler pressure and top it up if necessary. Maintaining a service record is important for warranty validation and future reference.
Beyond annual servicing, simple maintenance tasks like checking the system pressure monthly and keeping the area around the boiler clear can contribute to its longevity. Ignoring maintenance can lead to reduced efficiency, higher energy bills, and potentially dangerous situations.
Detailed Technical Specifications
The Ideal Logic Combi 35 boasts a compact design and delivers a central heating output of 35kW. Its hot water flow rate is an impressive 14 litres per minute, making it suitable for most households. The boiler operates on natural gas and features a fully modulating fan for optimal efficiency.
Key specifications include dimensions of 700mm (H) x 390mm (W) x 290mm (D) and a weight of 31kg. It’s an ErP A-rated boiler, demonstrating its energy efficiency. The system’s operating pressure ranges from 1.0 to 1.5 bar. The boiler also features a low NOx emissions level, contributing to environmental responsibility.
Furthermore, the Logic Combi 35 incorporates a pre-mix burner and a fully sealed combustion chamber. Its frost protection ensures reliable operation in colder climates. Detailed electrical specifications, including voltage and power consumption, are available in the full installation guide.

Frequently Asked Questions (FAQ)
Q: What does an error code E16 mean? A: E16 typically indicates a flame sensing issue; check the flue and gas supply. Q: How do I reset my boiler? A: Press and hold the reset button (usually located on the control panel) for three seconds. Q: Why is my boiler losing pressure? A: A small pressure drop is normal, but significant loss may indicate a leak – check radiators and pipework.
Q: Can I control the boiler remotely? A: With the addition of a compatible smart thermostat, remote control via a smartphone app is possible. Q: How often should the boiler be serviced? A: Annual servicing by a qualified Gas Safe engineer is highly recommended. Q: What fuel type does it use? A: The Logic Combi 35 is designed for natural gas.
Q: How do I bleed my radiators? A: Use a radiator key to open the bleed valve, releasing trapped air until water appears. Q: Is this boiler suitable for large homes? A: Its 35kW output makes it suitable for medium to large-sized homes with multiple radiators.
Warranty Information and Support
Your Ideal Logic Combi 35 boiler is covered by a standard manufacturer’s warranty, typically lasting for a period of one to ten years, depending on the specific model and registration status. Registration within 30 days of installation is crucial to validate the extended warranty periods. The warranty covers defects in materials and workmanship, but excludes issues arising from improper installation, scale buildup, or lack of regular servicing.
For technical support and warranty claims, please contact Ideal Heating directly through their official website or dedicated customer service helpline. Ensure you have your boiler’s serial number and installation date readily available; A network of accredited Gas Safe registered engineers is available for repairs and maintenance.
Additional support resources, including online FAQs, troubleshooting guides, and downloadable manuals, can be found on the Ideal Heating support portal. Retain this manual and your proof of purchase for warranty purposes.







































































