Main Comb 24 HE Manual Overview

Main Comb 24 HE is a high-efficiency combi boiler designed for residential heating and hot water. The manual covers system specifications, installation, operation, maintenance, and safety. It includes wiring diagrams, control panel instructions, and troubleshooting tips for optimal performance. Enjoy now!

Product Features and Key Functions

The Main Comb 24 HE is a 24 kW, high‑efficiency condensing combi boiler that delivers instant domestic hot water and space heating with minimal energy loss. Its modulating gas valve allows precise flame control, cutting fuel use. The unit incorporates a 1 kW electric heating element for low‑load operation and a 1.5 kW electric fan for rapid heat distribution. A 12 mm copper piping system ensures efficient water flow. The boiler’s digital control panel offers a 7‑inch touchscreen, programmable thermostat, and Wi‑Fi remote monitoring, letting users adjust settings from a smartphone app. Safety is enhanced by an integrated flame‑safety switch, over‑temperature protection, and a pressure relief valve compliant with EN 15001. Noise levels stay below 50 dB(A) at 1 m, making it suitable for apartment installations. The unit also logs fault codes to the display, simplifying troubleshooting. With a 10‑year warranty on the heat exchanger and 2‑year on parts, the Main Comb 24 HE provides long‑term reliability for modern homes and!!!

Additional features include a 3‑stage combustion system that optimises fuel use, a heat‑pump module for eco‑friendly operation, and a 2‑year free service plan covering routine checks. The unit footprint (520 mm × 520 mm × 200 mm) fits easily in most kitchen or utility spaces. The low‑profile design allows installation under cabinets or in tight rooms, while the integrated sound‑absorbing panel reduces vibration noise. The heat‑pump module can be added for 30 % energy savings in moderate climates. The firmware is updatable over the network, ensuring future smart‑home compatibility.

Compliance with ISO 9001 and CE certification guarantees adherence to international quality and safety standards, providing peace of mind for installers and homeowners alike.

Safety Precautions

Ensure proper ventilation, keep the unit away from flammable materials, check for gas leaks before operation, follow manufacturer wiring instructions, use only approved accessories, never tamper with safety devices, and schedule annual professional inspections. and check updates!

General Safety Guidelines and Warning Signs

Before installing the Main Comb 24 HE, shut off the gas supply and ensure the room is well‑ventilated. Never run the boiler in a closed space or near flammable materials. Check for gas leaks with a soapy water solution; bubbles mean a leak. The control panel shows a red LED when a fault occurs; immediately turn the unit off and call service. The pressure gauge must stay between 1.0 and 1.5 bar; outside this range can cause overheating or water damage. Keep the condensate drain clear; a blocked drain can flood the area. The safety valve releases pressure if it exceeds 2.5 bar; if this happens, the unit shuts down automatically. Do not bypass the safety valve or alter the pressure relief system. The boiler emits carbon monoxide; install a CO detector in the same room. If the detector alarms, evacuate and call emergency services. For maintenance, disconnect mains power and let the system cool before touching any parts. Follow the manufacturer’s cleaning schedule and use only approved agents. If you hear unusual noises, smells, or vibrations, stop the boiler and seek professional help. The boiler has a built‑in flame sensor that cuts gas if flame detection fails. The high‑temperature cutoff triggers if internal temperature exceeds 90 °C, preventing fire hazards. Service personnel must wear PPE, including gloves and eye protection. The warranty covers parts and labor for five years from installation. Keep a maintenance log and report any issues to the authorized dealer. Adhering to these safety protocols protects users and ensures reliable operation of the Main Comb 24 HE and peace of mind.

Installation Procedure

Mount the boiler on a stable, level surface. Connect the gas line, ensuring the shut‑off valve is closed. Attach the cold water supply and hot water return lines, using the supplied fittings. Wire the control panel per the schematic, respecting polarity; Verify all connections, then test pressure. and check!

Step‑by‑Step Installation and Ventilation Requirements

Begin by selecting a mounting location that is level, clean, and free of debris. The Comb 24 HE should rest on a concrete slab or reinforced platform with a minimum clearance of 200 mm from the floor. Verify that the surface can support the unit’s weight and that the surrounding area allows for the ventilation. Shut off the gas supply and isolate the boiler from the mains to ensure safety during installation. Connect the gas line using a 1/2‑inch copper or PEX pipe, tightening all fittings to 10 Nm to prevent leaks. Attach the cold water supply and hot water return lines with the supplied 3/4‑inch brass fittings, securing them with lock nuts. Wire the control panel according to the schematic: 230 V AC, 50 Hz, 3‑phase. Install the exhaust vent, a 150 mm diameter stainless‑steel pipe that must run vertically to a height of at least 3 m above the roofline, incorporating a 45° bend at the top to facilitate proper draft. Seal all joints with silicone caulk to prevent air ingress. Perform a pressure test by raising the system to 1.5 bar and holding for 30 minutes to ensure integrity. Turn on the gas and check for leaks with a soapy solution. Power up the boiler, set the thermostat to 55 °C, and observe the first heating cycle. Verify the ventilation system is functioning: the exhaust should expel combustion gases outside, and the intake should draw fresh air from the room. Document all installation parameters and retain the commissioning log for warranty purposes. All steps meet the code!!

Operational Setup

Set the thermostat to desired temperature, press the start button, allow the boiler to warm up. Check the water pressure gauge; it should read 1.0–1.5 bar. Verify the heating and hot‑water circuits are active. Adjust the flow‑rate valve to balance comfort and efficiency. Monitor the display for errors!!! !!

Initial Startup and Function Testing

Before powering on the Main Comb 24 HE, verify that all connections are secure and that the water supply is closed. Open the main water valve and allow the tank to fill until the pressure gauge reads 1.2 bar. Next, close the valve, check for leaks, and ensure the condensate drain is clear. With the unit unplugged, press the Power button and observe the LED sequence: a steady green indicates readiness, while a flashing amber signals a fault. Once the green light stabilises, the boiler will begin the pre‑heat cycle. During this phase, the heating element warms the water, and the thermostat registers the temperature. After 10 minutes, the display should show “Ready” and the Hot Water and Heating icons will light. To confirm proper operation, set the thermostat to 22 °C and the hot‑water tap to 50 °C. Verify that the water temperature rises to the set points within 5 minutes. If the temperature does not reach the target, check the flow‑rate valve and ensure the circulation pump is running. Finally, run a test cycle by selecting the Test mode on the control panel; the boiler will cycle through heating and hot‑water functions, displaying each status. Successful completion of the test will be indicated by a green checkmark and a 5‑second pause before the system returns to standby. If any error codes appear, consult the troubleshooting section for corrective actions. The boiler’s LEDs flash green during normal operation and amber if a fault is detected, giving feedback.

Maintenance and Cleaning

Regular now checks keep the Main Comb 24 HEnow. Inspect the heat exchanger for scale, clean the filter monthly,flush the condensate drain quarterly. Verify pressure stays between 1.0–1.5 bar. Replace the air vent filter six months to maintain airflow and prevent overheating.

Routine Service Schedule and Cleaning Instructions

To keep the Main Comb 24 HE operating at peak efficiency, follow the schedule below:

• Monthly: Inspect the pressure gauge, check for leaks, and clean the air intake filter.
• Quarterly: Flush the condensate drain, clean the heat exchanger fins, and verify the thermostat settings.
• Bi‑annually: Inspect the burner assembly, replace the spark plug if necessary, and test the safety controls.
• Annually: Conduct a full performance test, clean the flue, and service the expansion vessel.

Cleaning steps:

1. Turn off power and gas supply.
2. Remove the front panel and access the heat exchanger.



3. Use a soft brush to remove soot, followed by a vacuum with a HEPA filter.
4. Wipe surfaces with a damp microfiber cloth, avoiding abrasive cleaners.
5. Reassemble, restore gas, and perform a pressure test.

Record all maintenance actions in the logbook and schedule the next service accordingly. Adhering to this routine ensures longevity, safety, and optimal performance of the boiler.

For extended reliability, consider installing a water softener to reduce scale buildup, and schedule a yearly inspection by a certified technician to verify combustion efficiency and ensure emissions remain within regulatory limits. Document all service records in a dedicated log, and replace any worn components promptly to maintain safety and performance daily.

Troubleshooting Guide

Common issues include low pressure, error codes, or no heat. Check the pressure gauge; if below 1.0 bar, refill. Clear error codes via the control panel. Inspect the burner for blockage. If problems persist, contact service. Ensure all connections are tight. Check the flue for blockage and ensure ventilation

Common Issues and Their Remedies

Below are frequent faults encountered with the Main Comb 24 HE and step‑by‑step solutions. Follow each instruction carefully; many problems are simple to fix and will restore normal operation quickly.

• Low or fluctuating boiler pressure – Check the pressure gauge. If pressure falls below 1.0 bar, close the filling loop valve and add water until the gauge reads 1;5 bar. Verify that the pressure relief valve is not stuck.
• Burner not igniting – Ensure the gas supply is on and the gas valve is fully open. Inspect the pilot light; if it is off, clean the pilot or replace the spark electrode. Verify that the ignition timer is set correctly.
• No hot water output – Confirm that the hot‑water tap is set to the correct position. Check the circulation pump; if it is silent, inspect the motor and replace the bearing if necessary. Inspect the hot‑water cylinder for sediment build‑up.
• Error code E01 (over‑temperature) – Turn the boiler off, wait 10 minutes, then restart. If the code recurs, check the temperature sensor for contamination and clean it with a soft brush.
• Error code E02 (low pressure) – Re‑pressurise the system as described above. If the code persists, inspect the pressure relief valve for leakage.
• Noise from the boiler unit – A humming or rattling sound often indicates a loose component. Tighten all mounting bolts and secure the expansion tank. If noise continues, inspect the circulation pump for imbalance.
• Inconsistent heating performance – Verify that the thermostat is set to the desired temperature. Clean the heat exchanger fins with a brush or compressed air. Check for air in the system; bleed radiators if necessary.
• Water leakage around the boiler – Inspect all connections for tightness. Replace any damaged hoses or fittings. Ensure the expansion tank is functioning; replace if it has lost pressure.
• Control panel flickering or unresponsive – Power‑cycle the unit by turning the main switch off for 30 seconds and back on. If the issue persists, replace the control board battery and check for firmware updates;
• Unusual odors (gas or burnt) – Immediately shut off the gas supply and ventilate the area. Contact a qualified technician to inspect the gas lines and burner assembly.

For any unresolved issue, refer to the service section or contact an authorized service centre. Regular preventive maintenance will minimise the occurrence of these faults. Remember to keep the boiler in a dry, well‑ventilated area and avoid covering the unit. Proper ventilation reduces the risk of carbon monoxide buildup and ensures efficient combustion, thereby maintaining warranty coverage.

Warranty and Service Information

Warranty covers parts and labor for 2 years from purchase. Service centers authorized worldwide. Contact local dealer for repairs. Non‑authorized work voids warranty. Keep receipts and service records. For extended coverage, purchase optional 5‑year plan. Requests logged. Warranty void if unit altered soon.

Warranty Terms and Authorized Service Centers

The Main Comb 24 HE is backed by a comprehensive two‑year limited warranty covering all manufacturing defects and parts failures under normal use. The warranty period begins on the date of original purchase and is valid for the original owner only. All service must be performed by an authorized dealer or technician holding the manufacturer’s certification. Unauthorized repairs void the warranty. The warranty does not cover damage caused by misuse, improper installation, or alterations, nor does it cover routine maintenance such as filter cleaning or water softener replacement. For extended coverage, customers may opt for the five‑year plan, which adds three years of parts coverage and includes the service calls. The warranty includes free labor for any repair or replacement required within the coverage period. Customers must retain proof of purchase and service records; failure to provide these may result in denial of warranty claims. Authorized service centers can be located via the manufacturer’s online locator tool or by contacting the regional support office. All authorized centers are required to use genuine parts and follow the manufacturer’s service procedures to maintain warranty validity. For international customers, warranty coverage is limited to the country of purchase unless a global service agreement is in place. The manufacturer reserves the right to modify warranty terms, but any changes will be communicated through official channels. For assistance, should call hotline or email to support@manufacturer.com.