CodeRegistry
Brands
  1. Home
  2. Worcester Bosch
  3. Boilers
  4. EA 234
About·Privacy·Terms

CodeRegistry — Your global library for technical solutions.

For your safety: always follow the equipment manufacturer’s official manuals. CodeRegistry is an independent help site and is not affiliated with the brands listed here.

EA 234

EA 234 — Gas valve contacts interrupted

Worcester Bosch · Boilers

What does EA 234 mean?

The contacts of the gas valve have been interrupted. This means the gas valve is not able to open or close correctly, preventing gas flow to the burner.

Common Causes

  • Loose or disconnected wiring to the gas valve.
  • Damaged gas valve wiring.
  • Defective gas valve solenoid.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Power cycle the boiler by turning off the main power for 30 seconds, then restart it.

  2. 2

    Visually inspect the wiring connections to the gas valve to ensure they are secure.

  3. 3

    Contact a Gas Safe registered engineer to diagnose and repair the gas valve or its connections, as this is a critical gas safety issue.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

A1A1 — Water leak or pump dry runA1 281A1 281 — Pump stuck or running dryA3 317A3 317 — Flue gas temperature sensor short circuit
Source: Worcester Bosch Boilers
Open Manual (Page 44)Search more codes in this manual