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Worcester Bosch Greenstar 4000 System fault 3071

Comfort + II RF communication fault

Gas boiler

What it means

Communication or configuration fault related to Comfort + II RF room control.

Likely causes

  1. Incorrect address/configuration setting
  2. Damaged EMS connection cable
  3. Faulty room control

Where to start

  1. Check the configuration (address setting)
  2. Check the EMS connection cable of the room control for damage
  3. Check BUS voltage on the room control

The full answer, free

  • 1 more check in order
  • The readings and component tests from the manual
  • How to put it right, step by step
  • The manual page for this fault (page 78), right under the answer
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Safety: Isolate gas and power before you open the case. If you have been into the gas side, do a tightness test, and a combustion and flue check before you hand back. Gas Safe (UK) or RGI (Ireland) work only.

From the Worcester Bosch manual for the Greenstar 4000 System. Check the model on the data plate before you order parts.

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