What if boiler cannot be ignited in the operation when the pressure is normal?

If a boiler cannot be ignited during operation when the pressure is normal and there is electricity, it suggests an issue with the ignition system or another component of the boiler. Here are some steps and considerations to diagnose and potentially resolve the problem:

1. Check the Fuel Supply: Ensure that there is an adequate supply of fuel (gas, oil, or biomass, depending on the type of boiler). If the fuel supply is obstructed or empty, the boiler won't ignite.

2. Inspect the Ignition System: The problem could be with the igniters or spark electrodes. They might be dirty, damaged, or improperly positioned. Check for any visible signs of wear or damage.

3. Examine the Pilot Light (for Gas Boilers): If the pilot light has gone out, the boiler won't ignite. Follow the manufacturer's instructions to safely relight it.

4. Thermostat Issues: Ensure the thermostat is set to an appropriate temperature. If it's set too low, the boiler may not ignite. Also, check if the thermostat is functioning correctly.

5. Electrical Connections: Check for any loose or faulty electrical connections that might prevent ignition. However, do not touch any electrical components unless you are qualified to do so.

6. Safety Lockout: Boilers have safety mechanisms that lockout the system under certain conditions (like repeated failed ignition attempts). This may require resetting the boiler according to the manufacturer's instructions.

7. Air Supply and Ventilation: Insufficient air supply or poor ventilation can prevent ignition. Ensure that air vents or flues are not blocked.

8. Control Board or Sensor Issues: Faulty control boards or malfunctioning sensors (like pressure or heat sensors) can prevent ignition.

9. Professional Assistance: If you're unable to diagnose the issue, or if it involves gas or electrical components, it's best to call a qualified technician. Tampering with gas or electrical parts can be dangerous.

10. Regular Maintenance: Regular maintenance by a professional can prevent such issues. They can identify and resolve minor issues before they become major problems.

Remember, safety is paramount. Do not attempt repairs that are beyond your skill level, especially with gas or electrical systems. When in doubt, always consult a professional.