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Worcester Bosch CDi Combi Boiler Fault Codes

If you live in Kent, from Canterbury to Maidstone, Gillingham to Tonbridge, knowing how to diagnose your Worcester Bosch CDi Combi boiler fault codes can save you stress, time and money. Our local engineers at Plumble have compiled this complete guide to help you identify and understand common error codes.

EA – Ignition Failure

This is one of the most common Worcester boiler errors. It usually means the boiler has failed to ignite.

D1 – Sensor Fault

The D1 code indicates a problem with the temperature sensor inside the boiler.

  • It could be due to a loose wire or a faulty sensor that needs replacing.

E9 – Overheat Lockout

Boiler overheating can be dangerous. This error locks the boiler to prevent further operation.

  • Often related to low water pressure, pump failure, or blocked heat exchanger.

A1 – Dry Fire

This error means the boiler has operated without enough water.

  • Check pressure gauge (should be around 1.5 bar). Top up water if needed.

B7 – PCB Error

This suggests a fault in the Printed Circuit Board (PCB).

  • Usually needs a qualified engineer to inspect or replace.

Complete Worcester Bosch CDi Fault Codes Chart

Fault Code Description
EA Ignition Failure
D1 Sensor Fault
E9 Overheat Lockout
A1 Dry Fire
B7 PCB Error
F0 Fan Speed Error
CE Service Mode Activated
H07 Flow Sensor Error
E5 Heat exchanger sensor fault
C6 Fan not running / running too slowly
D5 Return sensor error
H11 Flow temperature too high
F7 Ionisation fault
A7 Flow temperature sensor faulty
2965 Communication error between display and main PCB

Why Regular Servicing Matters

Servicing your Worcester Bosch CDi Combi boiler annually is essential for safety, efficiency, and longevity. During a service, engineers can spot potential issues before they become costly breakdowns. This ensures your boiler runs smoothly during the cold Kent winters, and keeps your warranty valid.

Neglecting servicing often leads to blocked filters, pressure drops, and increased energy consumption. We recommend servicing your boiler every 12 months. Click here to book your annual boiler service in Kent with Plumble.

Recommended Upgrades to Prevent Breakdowns

Upgrades can make a major difference in boiler performance and lifespan. Here are some common upgrades we recommend across Kent:

  • Magnetic Filters – These trap sludge and debris, protecting your boiler and heating system.
  • Smart Thermostats – Improve efficiency and control your heating remotely.
  • System Flush – Clears out built-up sludge to improve flow and heat distribution.
  • Limescale Reducers – Especially useful in hard water areas like Kent, preventing scale build-up.

Our engineers can install and advise on the right solution for your home. Click here to request a quote or call us on 01732 622990.

Need help diagnosing a boiler issue in Kent? Call us on 01732 622990 or click here to contact us.

We cover all areas across Kent including Canterbury, Maidstone, Tonbridge, Sevenoaks and many more. For reliable Worcester Bosch boiler servicing, repairs, and replacements, trust Plumble – your local experts.

 

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