Ideal Instinct 2 Boiler: A Comprehensive Guide
Welcome! This detailed manual provides essential guidance for the safe and efficient operation of your new Ideal Instinct 2 boiler system.
Understanding Your Instinct 2
The Ideal Instinct 2 is a highly efficient condensing boiler, designed to provide reliable heating and hot water for your home. It utilizes advanced combustion technology to maximize fuel efficiency and minimize emissions, contributing to lower energy bills and a reduced carbon footprint.
This boiler is available in a range of outputs to suit different property sizes and heating demands. Key components include a high-efficiency heat exchanger, a modulating fan, and a sophisticated control system. The Instinct 2 features a user-friendly interface for easy operation and adjustment of settings.
Understanding the core principles of condensing boiler technology is beneficial. These boilers recover latent heat from flue gases, increasing overall efficiency. Regular maintenance, as outlined in this manual, is crucial for maintaining optimal performance and longevity of your Instinct 2 boiler.
Boiler Model Variations
The Ideal Instinct 2 range offers several models to cater to diverse heating needs. Available outputs include 24kW, 28kW, 32kW, and 36kW, allowing selection based on your home’s size and hot water demand. Each model maintains the core efficiency and features of the Instinct 2 series.
Furthermore, options exist for combi boilers – providing both central heating and on-demand hot water – and system boilers, requiring a separate hot water storage cylinder. The combi models are particularly popular for their space-saving design and convenience.
Identifying your specific model is crucial for accurate servicing and parts replacement. The model number is located on the boiler’s rating plate, typically found inside the front panel. Refer to this number when contacting customer support or ordering replacement components to ensure compatibility.

Initial Setup & Commissioning
Important: Proper installation and commissioning by a qualified engineer are vital for optimal performance and longevity of your Instinct 2 boiler.
Unpacking and Inspection
Upon delivery, carefully inspect the packaging for any signs of damage during transit. Do not accept the delivery if the packaging is visibly compromised. Once accepted, carefully unpack the Ideal Instinct 2 boiler, ensuring all protective materials are removed.
Cross-reference the contents against the supplied packing list to verify that all components are present. This includes the boiler unit itself, the flue assembly, mounting brackets, and all associated documentation – including this manual!
Thoroughly examine the boiler for any cosmetic damage, such as dents or scratches. More importantly, inspect all connections and components for any signs of looseness or damage. Report any discrepancies or damage immediately to your supplier and the delivery company. Retain all packaging materials until you are satisfied that the boiler is functioning correctly. Failure to do so may invalidate your warranty.
Filling the System
Crucially, before powering on your Ideal Instinct 2, the entire heating system must be thoroughly filled with water and bled to remove all air. Locate the filling loop – typically near the boiler – and ensure both isolation valves are closed. Connect a hose to the filling loop and attach the other end to a potable water supply.
Slowly open the first isolation valve, then partially open the second to allow water to flow into the system. Monitor the pressure gauge on the boiler; the ideal pressure is typically between 1 and 1.5 bar (check your specific model’s requirements). Once the correct pressure is reached, close both valves.

Now, systematically bleed all radiators, starting with those closest to the boiler and working your way outwards. Repeat the filling and bleeding process until no more air is released from the radiators and the system pressure remains stable.
Powering On & Initial Checks
With the system fully filled and bled, you can now safely power on your Ideal Instinct 2 boiler. Locate the power switch – usually on the front panel – and turn it to the ‘On’ position. The boiler’s control panel will illuminate, initiating its start-up sequence.
Observe the display for any immediate error messages. If none appear, allow the boiler a few minutes to complete its self-checks. Verify that the gas supply is open and that all connections appear secure.
Test the heating by turning up the thermostat and confirming that the radiators begin to warm. Also, test the hot water function by opening a hot water tap. Listen for normal operating sounds – a gentle hum from the pump and the burner igniting. If anything sounds unusual, immediately switch off the boiler and consult a qualified engineer.

Operating Your Instinct 2
Mastering your boiler’s functions is simple! This section details how to effectively utilize the control panel and features for optimal comfort and efficiency.
Understanding the Control Panel
The Instinct 2’s control panel is designed for intuitive operation, providing clear information and easy access to key functions. At the center, you’ll find the digital display, which shows the current system temperature, time, and any active error codes. Surrounding the display are several buttons, each dedicated to a specific task.
The ‘Power’ button, unsurprisingly, turns the boiler on and off. The ‘Menu’ button allows you to navigate through the various settings, including temperature adjustments, timer programming, and advanced features. Use the ‘Up’ and ‘Down’ arrow buttons to scroll through menu options and adjust values. The ‘Select’ or ‘Enter’ button confirms your choices.
Pay attention to the indicator lights. A solid green light typically signifies normal operation, while a flashing light often indicates an issue requiring attention. Refer to the ‘Common Fault Codes & Solutions’ section for detailed explanations of specific light patterns. Familiarizing yourself with these controls will ensure smooth and efficient boiler operation.
Setting the Temperature
Adjusting the heating temperature on your Instinct 2 is straightforward. First, press the ‘Menu’ button on the control panel until you reach the ‘Temperature’ setting – it’s usually indicated by a thermometer icon. Use the ‘Up’ and ‘Down’ arrow buttons to increase or decrease the desired temperature. The display will show the setpoint in degrees Celsius.

Remember that a lower temperature saves energy, but may not provide sufficient warmth during colder periods. Conversely, a higher temperature ensures comfort but increases energy consumption. We recommend a comfortable setting of between 20-22°C.
Once you’ve selected your desired temperature, press the ‘Select’ or ‘Enter’ button to confirm. The boiler will then adjust to maintain that temperature. You can also set different temperatures for different times of the day using the timer function – see the ‘Using the Timer Function’ section for details.
Using the Timer Function
The Instinct 2’s timer function allows for programmable heating schedules, maximizing comfort and energy savings. Access the timer settings by pressing the ‘Menu’ button and navigating to ‘Timer’ – often represented by a clock icon. You’ll likely see pre-set programs or the option to create your own.
To create a new program, select ‘New Program’ and define the start time, end time, and desired temperature for each period. You can typically set multiple periods per day (e.g., morning, evening, night). Use the arrow buttons to adjust these settings.
Ensure you ‘Save’ your program after making changes. You can enable or disable programs as needed; Utilizing the timer function effectively reduces wasted energy when the heating isn’t required, leading to lower bills and a reduced carbon footprint.
Hot Water Control
The Ideal Instinct 2 offers versatile hot water control options. Typically, you can adjust the hot water temperature via the control panel – navigate to the ‘Hot Water’ setting (often a tap icon). A temperature range is usually provided, allowing you to select a comfortable and safe level, generally between 38°C and 60°C.
Some models feature a ‘Comfort’ or ‘Eco’ hot water mode. ‘Comfort’ prioritizes rapid hot water delivery, while ‘Eco’ optimizes energy usage. Consider your household’s needs when selecting a mode.
Instantaneous hot water is a key feature; hot water is heated on demand. Be mindful of draw-off rates – multiple simultaneous hot water demands may slightly reduce flow. Regularly check for any inconsistencies in hot water temperature or flow, and consult a qualified engineer if issues arise.

Maintenance & Troubleshooting
Regular upkeep ensures peak performance and longevity. Addressing minor issues promptly can prevent costly repairs and maintain efficient boiler operation.
Regular Servicing – Why It’s Crucial
Annual servicing by a qualified engineer is non-negotiable for maintaining the Ideal Instinct 2 boiler’s efficiency, safety, and longevity. A comprehensive service includes a thorough inspection of all components – gas supply, burner, heat exchanger, flue, and controls – to identify potential issues before they escalate into major, expensive repairs.
Servicing ensures optimal combustion, reducing carbon emissions and lowering your energy bills. It also verifies the correct operation of safety devices, like the carbon monoxide detector, protecting your household from dangerous fumes. Furthermore, a documented service history is often required to validate your boiler’s warranty. Neglecting regular servicing can void the warranty and compromise the boiler’s performance, potentially leading to unexpected breakdowns, especially during colder months. Prioritize safety and efficiency – schedule your annual service today!
Descaling the Boiler
Limescale buildup is a common issue, particularly in hard water areas, and significantly reduces the Ideal Instinct 2 boiler’s efficiency. Descaling removes these mineral deposits from the heat exchanger, restoring optimal heat transfer and lowering energy consumption. Do not attempt descaling yourself; it requires specialized chemicals and expertise.
Contact a qualified heating engineer to perform this task. They will use a suitable descaling solution, circulate it through the system, and thoroughly flush it afterward to remove all traces of the chemical. Regular descaling – typically every 1-2 years, depending on water hardness – prevents component damage, extends the boiler’s lifespan, and maintains consistent performance. Ignoring descaling leads to reduced output, increased noise, and potential overheating. Professional descaling ensures a safe and effective process, protecting your investment.
Checking Water Pressure
Maintaining correct water pressure is vital for the Ideal Instinct 2 boiler’s efficient operation. The recommended pressure typically falls between 1 and 1.5 bar (14.5 – 21.7 psi), though refer to the pressure gauge on the boiler’s front panel for precise values. Low pressure can prevent the boiler from firing, while excessive pressure risks leaks and component failure.
To check, simply observe the gauge. If the pressure is too low, you may need to top up the system using the filling loop – consult a qualified engineer if unsure. If it’s too high, water may need to be bled from a radiator. Never ignore fluctuating or consistently abnormal pressure readings; these indicate a potential system issue requiring professional attention. Regular checks, ideally monthly, help identify and address problems early, preventing costly repairs and ensuring reliable heating and hot water.

Common Fault Codes & Solutions
Decoding error messages is crucial for quick diagnosis. This section details frequent fault codes displayed by your Ideal Instinct 2, alongside suggested resolutions.
Error Code E1 – Low Water Pressure
Error Code E1 indicates that the system water pressure has fallen below the minimum operating level required for the Ideal Instinct 2 boiler to function safely and efficiently. This is a common issue, often stemming from a leak somewhere within the central heating system, or simply natural pressure reduction over time.
Possible Causes: Leaks in radiators, pipework, or the boiler itself; automatic air vent releasing water; insufficient water top-up.
Solutions: First, check the boiler pressure gauge – it should ideally be between 1 and 1.5 bar. If below 1 bar, use the filling loop (consult your commissioning engineer if unsure) to carefully top up the system. Monitor the pressure after topping up to identify any persistent leaks. If the pressure continues to drop, or you cannot locate the leak, immediately contact a qualified heating engineer for assistance. Do not attempt repairs yourself if you are not competent.
Error Code E2 – Flame Failure
Error Code E2 signals that the Ideal Instinct 2 boiler is unable to detect a stable flame during the ignition process. This doesn’t necessarily indicate a gas supply problem, but rather an issue preventing successful combustion. Several factors can contribute to this fault, requiring careful investigation.
Possible Causes: Faulty ignition electrode; compromised gas valve; inadequate gas supply; blocked flue; or a problem with the Printed Circuit Board (PCB).
Solutions: Firstly, attempt a boiler reset – turn the boiler off and on again. If the error persists, do not attempt to disassemble or repair the boiler yourself. A gas-safe registered engineer must diagnose and rectify the issue. They will check the ignition components, gas supply, and flue for obstructions. Ignoring this error could lead to unsafe operation. Contact a qualified engineer immediately.
Error Code E3 – Overheat Protection
Error Code E3 on your Ideal Instinct 2 boiler indicates that the system has reached a dangerously high temperature, triggering the overheat protection mechanism. This is a critical safety feature designed to prevent damage to the boiler and potential hazards. Immediate attention is required.
Possible Causes: Restricted water flow (due to blocked pipes or a faulty pump); insufficient cold water supply; a malfunctioning thermostat; or a blocked heat exchanger.
Solutions: Immediately turn off the boiler. Do not attempt to restart it until the cause of the overheating is identified and resolved. Check radiators for cold spots indicating blockages. A qualified, Gas Safe registered engineer needs to inspect the system for restricted flow, pump functionality, and heat exchanger integrity. Ignoring this error can cause severe boiler damage. Contact a qualified engineer without delay.
Error Code E4 – Pump Failure
Error Code E4 signals a failure within the circulating pump of your Ideal Instinct 2 boiler. This pump is vital for moving hot water throughout your heating system; without it, heat won’t reach your radiators or taps. Addressing this issue promptly is crucial for restoring heating and hot water.
Possible Causes: A seized pump impeller (often due to sludge buildup); electrical fault within the pump motor; air lock within the system; or a failed pump capacitor.
Solutions: Turn off the boiler immediately. Do not repeatedly attempt to restart it, as this could further damage the pump. Check for any obvious blockages around the pump. A Gas Safe registered engineer must diagnose the exact cause – whether it’s a repairable fault or pump replacement. Contact a qualified engineer to avoid further complications and ensure safe operation.

Advanced Features & Settings
Explore the Instinct 2’s sophisticated capabilities, including modulation control, frost protection, and the useful system bypass function for optimal performance.
Modulation Control Explained
The Ideal Instinct 2 utilizes advanced modulation control to precisely match heat output to your home’s demand. Unlike traditional boilers that operate at full power or switch on and off, the Instinct 2 intelligently adjusts the burner’s intensity. This means it uses only the energy needed to maintain your set temperature, resulting in significant gas savings and improved efficiency.
This system analyzes factors like outside temperature, room temperature, and the flow rate of water through the heating system. Based on this data, the boiler modulates its output between a minimum and maximum level. You won’t notice abrupt temperature changes; instead, enjoy consistent and comfortable heating. Modulation also reduces wear and tear on the boiler components, extending its lifespan. The control panel displays modulation levels, allowing you to monitor performance. Properly functioning modulation is key to maximizing the boiler’s energy-saving potential.
Frost Protection Mode
The Ideal Instinct 2 is equipped with an automatic frost protection mode designed to prevent damage during periods of extremely cold weather, even when the heating system is switched off. If the boiler detects a significant drop in temperature – typically below 5°C (41°F) – it will automatically activate the burner for short periods.
This brief operation circulates warm water through the heating system, safeguarding pipes from freezing and bursting. Frost protection operates independently of your heating schedule and doesn’t require any manual intervention. A dedicated indicator light on the control panel illuminates when frost protection is active. While effective, it’s not a substitute for proper winterization of your property. Insulating exposed pipes and draining the system during prolonged absences are still recommended. This feature provides a crucial layer of defense against costly freeze damage.
System Bypass Function
The System Bypass feature on your Ideal Instinct 2 boiler allows a small amount of hot water to circulate even when no heating demand exists. This is particularly useful for systems with large radiator banks or underfloor heating, preventing stagnation and ensuring consistent warmth throughout. Activating the bypass minimizes cold spots and reduces the time needed to achieve desired temperatures when heating is requested.
The bypass is typically controlled through the boiler’s advanced settings menu, accessible via the control panel. Consult the installation engineer for optimal bypass settings tailored to your specific heating system. Incorrectly configured bypass can impact efficiency, so professional adjustment is advised. A partially open bypass can also help maintain water flow during power outages, potentially delaying freezing in colder climates. Remember to periodically review the bypass setting with a qualified technician.

Safety Information & Precautions
Prioritize safety! Always adhere to these crucial guidelines to prevent hazards and ensure the longevity of your Ideal Instinct 2 boiler.
Carbon Monoxide Awareness
Crucially, carbon monoxide (CO) is a colorless, odorless, and highly toxic gas produced by incomplete combustion. Your Ideal Instinct 2 boiler, while designed with safety features, requires proper ventilation and maintenance to prevent CO buildup.
Recognize the symptoms: Headache, dizziness, nausea, breathlessness, confusion, and loss of consciousness are all potential signs of CO poisoning. If anyone in your household experiences these symptoms, immediately evacuate the premises and call emergency services.
Install CO detectors: We strongly recommend installing certified carbon monoxide detectors on every level of your home, especially near sleeping areas. Regularly test these detectors to ensure they are functioning correctly. A properly maintained detector is your first line of defense.
Never ignore an alarm: If a CO alarm sounds, treat it as a serious emergency. Do not attempt to identify the source yourself; leave the building and contact a qualified engineer.
Emergency Shut-Off Procedure
In the event of a suspected boiler malfunction, such as a gas leak, unusual noises, or visible damage, knowing the emergency shut-off procedure is vital. Immediately locate the gas supply valve to the boiler – typically a yellow handle on the gas pipe.
Turn the handle 90 degrees so it is perpendicular to the pipe. This will cut off the gas supply to the appliance. Do not attempt to repair the boiler yourself.
Also, switch off the boiler at the mains electricity supply using the dedicated circuit breaker in your consumer unit. Ventilate the area by opening windows and doors. Do not use any naked flames or electrical devices that could create a spark.
Contact a Gas Safe registered engineer without delay to diagnose and repair the issue. Your safety is paramount; do not operate the boiler until it has been professionally inspected.
Contacting a Qualified Engineer
For all servicing, repairs, and safety checks relating to your Ideal Instinct 2 boiler, it is essential to use a qualified and Gas Safe registered engineer. Attempting repairs yourself could invalidate your warranty and, more importantly, pose a significant safety risk.
To find a registered engineer, visit the Gas Safe Register website at www.gassaferegister.org.uk or call their helpline on 0800 408 5500. Always verify the engineer’s credentials before allowing them to work on your boiler.
When contacting an engineer, be prepared to provide your boiler model number (Ideal Instinct 2) and a detailed description of the problem. Keep a record of all service visits, including the engineer’s name, Gas Safe registration number, and the work carried out. Regular professional maintenance ensures optimal performance and longevity.

Technical Specifications
Detailed specifications for the Ideal Instinct 2 boiler, including dimensions, weight, and energy efficiency ratings, are listed below for reference.
Boiler Dimensions & Weight
Understanding the physical characteristics of your Ideal Instinct 2 boiler is crucial for installation, servicing, and ensuring adequate space allocation. The compact design aims to minimize footprint while maximizing performance.
Dimensions: The standard Instinct 2 model measures 700mm in height, 400mm in width, and 290mm in depth. These measurements are approximate and may vary slightly depending on the specific model variation (e.g., combi, system, open vent). Always confirm with the unit’s label.
Weight: The average weight of the Instinct 2 boiler is approximately 32 kilograms. This weight is important to consider during installation, requiring appropriate lifting equipment and a structurally sound mounting surface. Ensure the wall can safely support the boiler’s weight when fully operational and filled with water. Incorrect installation could lead to damage or safety hazards.
Important Note: These figures are for guidance only. Refer to the specific documentation included with your boiler for precise dimensions and weight details.
Energy Efficiency Ratings
The Ideal Instinct 2 boiler is designed with energy efficiency as a core principle, helping you reduce your carbon footprint and lower heating costs. Understanding these ratings is vital for maximizing savings and environmental responsibility.
ErP Rating: The Instinct 2 boasts an impressive ErP (Energy-related Products) rating of A, signifying high efficiency. This rating considers seasonal space heating efficiency (ηs) and hot water efficiency (ηwh).
Seasonal Efficiency: The seasonal space heating efficiency (ηs) typically ranges from 92% to 94%, depending on the model’s output. Hot water efficiency (ηwh) generally falls between 86% and 89%. These percentages indicate how effectively the boiler converts fuel into usable heat.
SAP Rating: The Standard Assessment Procedure (SAP) rating for the Instinct 2 is also high, contributing positively to the overall energy performance of your home. Regularly servicing your boiler maintains optimal efficiency.