Worcester Bosch 28cdi Problems

The Worcester Bosch 28CDi combi boiler is known for its efficiency and durability. However, like any other piece of equipment, it can sometimes encounter problems. One of the issues users might face pertains to a reduced hot water flow when both the hot and cold taps are turned on. This article delves into this problem and offers possible solutions based on user experiences.

Problem Overview: When only the hot water tap is in operation, the flow is satisfactory. However, as soon as both the hot and cold taps are turned on, the hot water flow considerably diminishes, dropping to about a quarter of its original flow or even less. In addition, some users have noticed fluctuations in the temperature of the hot water.

Potential Solutions:

1. Check the Mains Stopcock: One of the initial diagnoses could be a partially closed or obstructed mains stopcock leading to the property. To ascertain if this is the problem, one should check if the same drop in flow occurs when two cold taps are opened simultaneously. If adjusting the stopcock resolves the issue, then it confirms the cause.
2. Hot Water Temperature Sensor: An irregular hot water temperature could be due to a malfunctioning hot water temperature sensor. One user experienced a resolution to the temperature fluctuation problem after replacing this sensor. However, it’s essential to ensure that a qualified engineer examines and replaces this part.
3. Water to Water Heat Exchanger Issues: If the hot water isn’t adequately hot, even when the temperature setting is at its maximum, the problem could lie in the ‘water to water’ heat exchanger. An engineer may suggest replacing this component if they diagnose it as the root cause. Still, it’s crucial to consult with professionals to determine the best course of action.
4. Gas to Water Exchanger & De-scaling: Another probable cause could be issues with the ‘gas to water’ exchanger, which might require de-scaling or replacement. Once again, consultation with a seasoned engineer is advised.
5. Blocked Secondary Hex: If there’s a consistent fluctuation in temperature, a blocked secondary hex could be the culprit.
6. Flow & Gas Levels: A constant too-cold water temperature could arise due to excessive water flow or insufficient gas. It’s crucial to ensure that both these parameters are at their optimal levels for the boiler to function effectively.

Conclusion: While these solutions provide a guideline based on shared experiences, it’s of paramount importance to consult with a professional engineer when encountering problems with the Worcester Bosch 28CDi. An expert can conduct a thorough diagnosis and recommend the best solution, ensuring the safety and longevity of the boiler.