Worcester 24i Boiler Problems

If you have a Worcester 24i combi boiler, you might find it to be a reliable heating system for many years. However, like all machines, it can run into problems. One user reported an issue where the boiler worked perfectly for eight years and then suddenly stopped functioning.

Problem:

• Cold water: Runs fine with normal pressure.
• Hot water: No hot water; only cold water comes out with normal pressure.
• Central Heating: No heating, but the pump seems to be working, circulating cold water through the radiators.
• There is no typical “click” sound or the light coming on when trying to initiate the boiler.

Initial Checks:

1. The printed circuit board (PCB) seems in good condition.
2. Relay switches and fuses appear fine after a visual check.
3. There’s speculation about a possible issue with the flow switch or pressure switch on the boiler.

Potential Solutions and Diagnostics:

1. Check the Pressure Gauge: If the pressure is less than 0.5 bar, the boiler won’t fire. It’s essential to maintain the right pressure. One user noted that if the boiler’s pressure drops below 1 bar, refilling the system typically resolves the issue.
2. Overheat Stat: There’s a possibility that the overheat stat might have popped out. It acts as a safety mechanism, shutting down the boiler in case of overheating. The position of this stat should be checked. If the boiler has overheated, it might have triggered the safety shut-off, even if the switch is still in the down position.
3. Flow Switch: The manual indicates the presence of a flow switch. This switch detects the flow of water and signals the boiler to light up. A malfunctioning flow switch might be the culprit. However, as some users have pointed out, if both hot water and central heating are non-functional, the issue might be more complex.
4. Air Pressure Switch (APS): If the fan of the boiler is running, the APS must activate before the ignition sequence starts. A gentle tap on the APS with an insulated tool might help. This is a common issue some engineers have encountered.
5. Locked Out System: If there are any flashing lights on the boiler, it could indicate a system lockout, which requires a reset.
6. External Feedback and Services: While some users are wary of the costs associated with calling out an engineer, it’s essential to note that professional boiler services should offer a diagnostic and repair service at reasonable prices. Most repairs might range from £84-£136 unless a major component like the PCB needs replacement.

Final Word:

While some homeowners might be adept at diagnosing minor issues, boilers are complex systems, and any work done on them should be approached with caution. If you’re not confident in your ability to address the problem, it’s always safer to consult with a professional, especially when dealing with gas appliances. Remember, safety first!