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Worcester Bosch Greenstar 4000 System fault 2972

Mains voltage too low

Gas boiler

What it means

Mains supply voltage detected below acceptable threshold.

Likely causes

  1. Low mains supply voltage
  2. Faulty control unit

Where to start

  1. Establish supply voltage of at least 196 VAC
  2. Check Maintenance type setting to determine reminder basis
  3. Check Installer tel. no. is correctly configured for Landlord mode

The full answer, free

  • The readings and component tests from the manual
  • How to put it right, step by step
  • The manual page for this fault (page 76), 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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