As the core heating equipment for homes, the ignition electrode and inductive needle are crucial components for ensuring successful ignition. With increasing years of use, these two parts may experience aging and carbon accumulation, leading to failed ignition or unstable combustion. This article will provide a detailed explanation of the replacement steps and offer a practical guide, combining the manufacturer's recommendations for gas wall-mounted boilers with the compatibility of different boiler brands.

Preparation Before the Change

Shut off the boiler's power and gas valves to ensure complete power and gas disconnection from the equipment, avoiding risks of gas leaks or electric shocks during operation.

Be prepared with a Phillips screwdriver, a wrench, insulating gloves, and new spark plugs and induction needles (matching the original equipment manufacturer's model).

If the boiler is installed inside a cabinet, sufficient operating space must be cleared in advance (leaving at least 50mm of clearance on both sides, and 200mm below).

Detailed Steps for Replacing Ignition Electrodes and Sensors

Disassemble old components

Step 1: Unscrew the exterior shell of the wall-mounted boiler, locate the ignition electrode (usually a metal pin) and the sensing pin (near the flame monitoring area).

Step 2: Loosen the fixed screws using a wrench or pliers, carefully pull out the connection wires to avoid excessive force that might damage the interface.

Please note: If the screws are rusted and difficult to remove, apply a rust remover and let it sit before proceeding. Do not force the screws.

Installed new components

Step 1: Align the new ignition electrode with the original mounting hole, insert it, and tighten the fixing screw to ensure the tip of the electrode is at the required distance from the burner as specified in the manual (usually 3-5mm).

Step 2: The sensor needle must be installed perpendicular to the flame detection area to avoid tilting, which may affect signal reception. The wiring terminals must be tightly inserted and secured with insulating tape.

Step 3: After restoring the shell, check the gas connection for leaks using soap and water (if bubbles form, reseal as needed).

Functional Testing

After re-powering and supplying gas, start the wall-mounted boiler to observe the ignition status. If there is a delay in ignition or frequent extinguishing, it may be due to the misalignment of the sensor needle or improper electrode spacing, which requires a second adjustment.

Section 3: Frequently Asked Questions

Q: How often should ignition electrodes and induction needles be replaced?

The normal service life is 3-5 years. If frequent ignition failures or abnormal flame detection occur, a pre-emptive check and replacement are required.

Q: Will self-replacement affect the warranty?

Some gas wall-hung boiler manufacturers stipulate that unauthorized disassembly will invalidate the warranty; it is recommended to consult the after-sales policy first.