Overview of Ideal Isar HE24
The Ideal Isar HE24 is a compact, efficient condensing boiler designed for domestic hot water and central heating. It offers precise temperature control, frost protection, and over‑heat safety. With a 24 kW output, it fits small spaces while delivering reliable, low‑emission performance. Ideal Isar HE24 heat.!
Key Features and Technical Specifications
The Ideal Isar HE24 condensing boiler delivers 24 kW of heating power, making it suitable for small to medium domestic installations. Its compact 1.5 m height and 0.8 m width allow placement in tight spaces, while the 1.2 m² footprint keeps it unobtrusive. The unit incorporates a 1.5 kW electric heating element for instant hot‑water bursts, and a 0.5 kW auxiliary burner for high‑draw‑off periods. The boiler is fitted with a 1.2 kW electric circulation pump that ensures efficient flow to radiators and domestic hot water taps. Key safety features include a frost‑protection thermostat that automatically shuts the burner off if the water temperature falls below 5 °C, an over‑heat thermostat that limits the water temperature to 65 °C, and a pressure‑safety valve that releases excess pressure above 1.5 bar. The control panel displays a 4‑digit LED readout for temperature, pressure, and fault codes, and features a programmable 3‑stage thermostat for central heating. The Isar HE24 is compliant with EN 303‑5, EN 60335‑2‑44, and the UK’s BS 6470, ensuring low emissions (≤ 0.12 kg CO₂ kWh⁻¹) and a 10‑year warranty on the boiler. The unit’s wiring diagram supports a 230 V single‑phase supply, and the boiler can be integrated with a 4‑wire thermostat or a 7‑wire thermostat for advanced control. The Isar HE24’s design also includes a built‑in dry‑fire sensor that prevents operation if the flame is not detected, and a lock‑out feature that disables the boiler during maintenance. Overall, the Ideal Isar HE24 combines high efficiency, safety, and flexibility, making it a reliable choice for modern households.
The Isar HE24’s installation demands a 10 mm return pipe and a 16 mm supply pipe, with at least 150 mm clearance for maintenance. Its 3‑pass copper heat exchanger ensures efficient heat transfer. The unit supports a 24‑hour timer and a 7‑day schedule, enabling custom heating periods for weekdays and weekends. Connectivity options include a Wi‑Fi module that reports status and fault codes to a mobile app. Service ports feature an 8‑pin diagnostic connector and a 2‑pin external thermostat link. A low‑noise fan operates at 35 dB(A) at 1 m. The user manual offers wiring diagrams, safety instructions, and a maintenance checklist recommending heat‑exchanger cleaning every 12 months and quarterly pressure‑gauge checks. These features make the Ideal Isar HE24 a versatile, user‑friendly boiler for diverse domestic heating needs. Its backlit LCD shows temperature, pressure, and fault codes for quick diagnostics. Now. Use
Intended Applications and System Compatibility
The Ideal Isar HE24 is engineered for domestic heating systems that demand a compact yet powerful solution. Its 24 kW output is ideal for single‑family homes with moderate central heating and domestic hot water needs. The boiler’s footprint of 1.2 m² and dimensions of 1.5 m height by 0.8 m width enable installation in tight spaces such as utility rooms or under kitchen cabinets. It is fully compatible with standard 230 V single‑phase mains and can be wired to either a 4‑wire or 7‑wire thermostat, allowing integration with existing heating controls or modern smart‑home platforms. The Isar HE24’s 3‑pass copper heat exchanger delivers high efficiency, and its 1.2 kW electric circulation pump ensures consistent flow to radiators and domestic taps. For homes that require instant hot water bursts, the built‑in 1.5 kW electric heating element provides rapid response, while the 0.5 kW auxiliary burner activates during high‑draw‑off periods to maintain pressure. Safety features such as frost protection, an over‑heat thermostat limiting water to 65 °C, and a pressure‑safety valve that releases above 1.5 bar make the unit reliable in varied climates. The control panel’s 4‑digit LED display shows temperature, pressure, and fault codes, and the 3‑stage thermostat allows precise scheduling. The boiler complies with EN 303‑5, EN 60335‑2‑44, and BS 6470, guaranteeing low emissions (≤ 0.12 kg CO₂ kWh⁻¹) and a 10‑year warranty. Installation requires a 10 mm return pipe, 16 mm supply pipe, and at least 150 mm clearance for maintenance. The Isar HE24 can be paired with a 24‑hour timer, a 7‑day schedule, or a Wi‑Fi module for remote monitoring. Service ports include an 8‑pin diagnostic connector and a 2‑pin external thermostat link. Routine maintenance such as heat‑exchanger cleaning every 12 months and quarterly pressure‑gauge checks ensures long‑term performance. Its low‑noise fan operates at 35 dB(A) at 1 m, ensuring quiet operation in living spaces. Overall, the Ideal Isar HE24 offers a versatile, efficient, and safe heating solution that fits a wide range of domestic applications, from small apartments to larger family homes, while maintaining compliance with stringent safety and environmental standards. Its 10‑year warranty and low emissions make it an attractive choice for environmentally conscious homeowners seeking reliable performance and peace of mind.
Installation Guide
The Ideal Isar HE24 installation requires a 230 V single‑phase supply, 10 mm return and 16 mm supply pipes, and a 150 mm clearance. Mount the unit on a stable surface, connect the thermostat, and secure the circulation pump. Follow the wiring diagram, test pressure, and verify safety valves. Check for leaks.!
Pre‑Installation Preparations
Before installing the Ideal Isar HE24, ensure the site meets all safety and regulatory requirements. Verify that the electrical supply is a 230 V single‑phase circuit with a dedicated 16 A circuit breaker and that the mains are de‑energised during installation. Confirm that the boiler’s mounting location provides a minimum 150 mm clearance on all sides, and that the floor is level and able to support the unit’s weight. Check that the return and supply pipework are correctly sized (10 mm return, 16 mm supply) and that the existing heating system is compatible with a condensing boiler. Install a dedicated 1 kW or higher capacity power supply, and ensure that the boiler’s safety valves are accessible and free from obstruction. Prepare a clean, dry working area, and gather all necessary tools: pipe cutter, torque wrench, pipe jointing kit, and a calibrated pressure gauge. Verify that the water supply is shut off, and that the system is depressurised before opening any valves. Label all connections clearly to avoid confusion during commissioning. If the boiler will be connected to a domestic hot water (DHW) system, install the DHW thermostat in a location that is easily reachable and protected from direct sunlight. Finally, review the manufacturer’s installation manual for any model‑specific instructions, and obtain any required permits or inspections before proceeding. This preparation phase ensures a safe, efficient installation and reduces the risk of future faults or safety hazards. Connections tightened to manufacturer torque spec ensures safety OK
Step‑by‑Step Installation Process
Position the Isar HE24 on a level, fire‑resistant base, ensuring a 150 mm clearance on all sides. 2. Connect the 230 V mains supply to the boiler’s dedicated 16 A circuit breaker, verifying correct polarity with a multimeter. 3. Attach the supply pipe (16 mm) to the boiler’s inlet, tightening to the manufacturer’s torque specification. 4. Fit the return pipe (10 mm) to the boiler’s outlet, again using the correct torque. 5. Install the domestic hot water (DHW) thermostat on the supply line, ensuring it is within the 65 °C maximum setting. 6. Connect the boiler’s safety valve to the system, checking for leaks. 7. Re‑pressurise the heating circuit to 1.5 bar, using a calibrated gauge. 8. Verify that the condensate drain is correctly sloped and connected to the sewage system. 9. Power on the boiler, observe the start‑up sequence, and confirm the display shows normal operation. 10. Perform a pressure test: raise the pressure to 2.0 bar and hold for 10 minutes, checking for drops. 11. If all checks pass, set the desired temperature on the thermostat and schedule the boiler’s operating times. 12. Finally, document the installation details and hand over the system to the end‑user, providing a brief safety briefing.13. Perform a final system check to ensure all connections are secure and that boiler’s safety features are functioning correctly before handing over the unit to the user. 14. Record all installation parameters, including pressure readings and thermostat settings, in the maintenance log for future reference. 15. Confirm safety certificates prior handover.
User Controls and Settings
The Isar HE24 features a digital display and intuitive controls. Users set desired water temperature via the front panel dial, limited to 65 °C for DHW. The thermostat can be programmed for heating schedules, and a frost‑protection mode automatically lowers set‑point during low‑draw periods. Display shows all now.!OK
Water Temperature Control Mechanisms
The Isar HE24 uses a dual control system that balances domestic hot water and central heating. A front‑panel dial sets the hot‑water temperature up to 65 °C, while the internal controller throttles the gas valve to keep the temperature steady. The system monitors inlet and outlet temperatures with high‑precision thermistors, automatically adjusting the valve to maintain a steady output.
During winter, the Isar HE24 activates a frost‑protection mode that lowers the hot‑water setpoint to 45 °C when ambient temperatures drop. This feature prevents pipe freezing while still delivering a modest supply. Users can override the mode with the “Frost” button, suspending protection until temperatures rise above the threshold. It uses an external sensor to detect low temperatures during soon
The boiler includes an over‑heat thermostat that monitors the heat‑exchanger temperature. If it exceeds 120 °C, the system shuts down the gas supply and triggers a fault code. Users can reset the fault by cycling power or pressing the “Reset” button on the control panel, after which the boiler resumes normal operation once the temperature stabilises. It also shows fault codes for quick troubleshooting at a glance Check!
The Isar HE24’s digital display shows real‑time temperature readouts for hot‑water and central‑heating circuits. Users can view the current temperature, setpoint, and any active fault codes directly on the screen, enabling quick diagnostics and adjustments. This interface simplifies monitoring and ensures optimal performance. The display also indicates the boiler’s operational status and any fault codes, providing clear guidance for maintenance at a glance Check!
Domestic Hot Water (DHW) Thermostat Operation
The DHW thermostat on the Ideal Isar HE24 is a front‑panel knob that sets the maximum domestic hot‑water temperature. Users can adjust the temperature from 45 °C to a maximum of 65 °C when the draw‑off rate is low; The thermostat is integrated with the boiler’s control logic; once the setpoint is reached, the gas valve throttles to maintain the desired temperature. If the draw‑off rate rises, the thermostat allows a slight temperature increase but never exceeds the 65 °C ceiling.
During winter, the system automatically engages frost protection, lowering the DHW setpoint to 45 °C to prevent pipe freezing. Users can override this mode by pressing the “Frost” button, suspending protection until ambient temperatures rise above the threshold. The thermostat also works with the over‑heat safety feature; if the water temperature approaches 120 °C, the boiler shuts down and displays a fault code. After the temperature drops, the user can reset the fault by cycling power or pressing the “Reset” button on the panel.
The display shows real‑time DHW temperature, setpoint, and any fault codes, allowing users to verify correct operation and detect anomalies early. If the temperature does not rise to the setpoint within a reasonable time, users should check water supply pressure and ensure the boiler receives power. The thermostat is compatible with external thermostatic mixing valves, providing precise control of water delivered to showers and taps. Regular cleaning of inlet and outlet filters helps maintain optimal flow and prevents the thermostat from being triggered by sediment buildup. Regular firmware updates keep the system compliant with regulations!
Safety Features and Protection Mechanisms
The Ideal Isar HE24 incorporates dual safety systems: a frost‑protection thermostat that lowers DHW temperature to 45 °C in cold weather, and an over‑heat sensor that shuts the boiler if water exceeds 120 °C. A pressure‑loss alarm triggers a fault code, prompting a reset via the panel. Safety first! Now! Check
Frost Protection and Overheat Thermostat
The Ideal Isar HE24 is equipped with an integrated frost‑protection thermostat that automatically reduces domestic hot water (DHW) output to a safe minimum of 45 °C when temperatures fall below a set threshold. This feature prevents freezing of the boiler’s internal piping and protects the system from damage during prolonged cold spells.
The thermostat continuously monitors boiler’s water temperature, if the setpoint drops below the frost‑protection limit, it switches DHW supply to the lower temperature setting while maintaining central heating at the user‑defined level.
Complementing frost protection, boiler incorporates an over‑heat safety sensor that monitors water temperature in real time. If the temperature rises above the safe limit of 120 °C, the sensor triggers an automatic shutdown of the burner and the circulation pump.
If the temperature rises above the safe limit of 120 °C, the sensor triggers an automatic shutdown of the burner and the circulation pump.
This safeguard protects the boiler’s components from stress and reduces the risk of fire or explosion.
This safeguard protects the boiler’s components from thermal stress and reduces the risk of fire or explosion. The over‑heat protection is designed to engage within milliseconds, ensuring that the temperature never exceeds the limit key of 120 °C, the sensor triggers an automatic shutdown of the burner and the circulation pump!
When either protection system is activated, boiler’s display will show a fault code (e.g., “F1” for frost protection or “O2” for over‑heat).
Then, by pressing “Reset” button on control panel, fault cleared and boiler very resumes norm cycling.
Then, by pressing the “Reset” button on the control panel, fault is cleared and the boiler very resumes norm cycling. If fault persists, user should consult troubleshooting section or contact a qualified technician.
This dual‑layer protection is a key feature that distinguishes Isar HE24 as a reliable choice for households seeking peace of mind and consistent performance.
Loss of System Water Pressure Handling
When the boiler detects a drop in system water pressure below the minimum operating threshold, it automatically initiates a safety shutdown to protect the heat exchanger and circulation pump. The pressure sensor, located near the boiler’s inlet, continuously monitors the pressure gauge reading. If the pressure falls below 0.8 bar, the system will trigger a fault code (L1) and the display will flash red to alert the user.
To restore normal operation, the user must first check the main water supply valve for any obstruction or partial closure. Ensure that the boiler’s pressure relief valve is not stuck and that the expansion vessel is fully charged. If the expansion vessel has lost charge, it will need to be re‑charged to the manufacturer’s recommended pressure, typically 1.5 bar.
Once the supply line is verified and the expansion vessel is correctly charged, the user can reset the fault by pressing the “Reset” button on the control panel. The boiler will then attempt to re‑establish pressure. If the pressure remains low, the system will automatically shut down again and display the fault code until the issue is resolved.
In cases where the pressure cannot be restored, a qualified technician should inspect the boiler’s piping for leaks, blockages, or faulty fittings. Regular maintenance, including periodic pressure checks and expansion vessel servicing, helps prevent loss‑of‑pressure incidents and ensures efficient boiler performance.
Troubleshooting and Fault Management
When the Ideal Isar HE24 displays a fault, first check power and wiring continuity. If the display shows “L1” or “L2”, reset by turning the boiler off for 30 seconds, then back on. Persistent faults require a technician. If fault persists, contact a service engineer.!
Common Fault Codes and Reset Procedures
When the Ideal Isar HE24 boiler indicates a fault, the first step is to consult the fault‑code list on the display. The most frequent codes are 01 (over‑heat), 02 (frost protection), 03 (loss of water pressure), 04 (dry‑fire), and 05 (electrical). Each code has a specific reset routine. For over‑heat (01), ensure the water temperature is below 70 °C, then switch the boiler off for 30 seconds before restoring power. Frost protection (02) is cleared by raising the ambient temperature or by manually turning the frost‑protection switch to “off” for 1 minute and then back to “on”. Loss of water pressure (03) requires checking the pressure gauge; if below 1.0 bar, refill the system and reset the boiler by powering it down for 20 seconds. Dry‑fire (04) indicates a missing flame; verify the gas supply and clean the burner, then reset by cycling the main switch. Electrical faults (05) often stem from a loose connection; inspect the mains wiring, secure terminals, and perform a reset by turning the boiler off for 10 seconds. If a fault persists after following the correct procedure, the boiler’s internal diagnostics will remain active and the display will continue to flash the code. In such cases, contact an authorised service technician to avoid further damage and ensure compliance with safety regulations. Proper maintenance and timely resets help keep the Isar HE24 running efficiently and safely. For further assistance, consult the manufacturer’s online support portal or contact local service technicians for professional guidance!
Power Supply and Display Issues
When the Ideal Isar HE24 boiler’s display fails to show the normal operating screen, the first diagnostic step is to verify that the mains supply is stable and that the boiler’s internal fuse is intact. A common cause of a blank or flickering display is a voltage drop below 230 V, which can happen if the boiler is connected to a circuit with high inductive load or if the main breaker has tripped. To test, use a multimeter to confirm 230 V at the boiler’s inlet. If voltage is correct, check the 12 V DC supply that powers the control board; a low battery or a faulty regulator will cause the display to freeze or reset to a default “0” reading. The control board’s reset button, located on the rear panel, can be pressed for 5 seconds to clear transient errors. If the display remains unresponsive, inspect the wiring harness for loose or corroded connectors, especially the 12 V feed and the 230 V supply. A common fault code 06 (display error) indicates a communication failure between the main board and the display module; this can be resolved by disconnecting the display for 10 seconds and reconnecting, then cycling the boiler. If the problem persists, the display module may be defective and should be replaced by a qualified service engineer. Always ensure the boiler is switched off and the mains disconnected before handling any electrical components to avoid shock or further damage. For detailed wiring diagrams and troubleshooting steps, refer to the official Ideal Isar HE24 service manual available on the manufacturer’s website or contact local support for assistance. If the boiler displays a blinking “P” or “E” code, this indicates a power‑related fault that requires checking the phase sequence and ensuring the correct polarity. In some installations, the boiler may be wired to a 240 V supply; if the voltage is mis‑rated, the control board will not power up. Verify the phase sequence using a phase sequence tester and correct any mis‑wiring. Additionally, the boiler’s built‑in surge protector may trip during a lightning event; resetting the protector involves turning the boiler off, waiting 30 seconds, and restoring power. Finally, if the display shows a “No Signal” message, this may be due to a broken ribbon cable; inspect the cable for kinks or disconnections and reseat the connectors. All these steps should be performed with the boiler disconnected from mains to ensure safety. In addition, the boiler’s LED indicator panel may show a red or amber light to signal a power issue; consult the indicator legend for exact meanings. If the LED remains on after a reset, the issue may be internal and requires professional diagnosis. Keep a log of any power events, including outages or surges, as this data helps technicians pinpoint faults. By following these checks, users can quickly isolate and resolve power supply and display problems, maintaining reliable operation of the Ideal Isar HE24 boiler. All set.
