TradeAssistIQHome

Worcester Bosch Greenstar 4000 System fault 237

System fault

Gas boiler

What it means

Locking fault (V category). General system fault relating to code plug or control unit.

Likely causes

  1. Damaged code plug
  2. Faulty control unit (PCB)

Where to start

  1. Check the code plug is not damaged.
  2. Navigate to Info menu to view Current status
  3. Check Boiler submenu for Max. heat output, Actual temp., Set flow temp., HEx temperature, Act. burner mod., Burner output, Ionisation current, Pump mod., Outside temp., Burner starts, Hours run, System pressure

The full answer, free

  • 3 more checks in order
  • How to put it right, step by step
  • The manual page for this fault (page 71), right under the answer
Ask about 237 freeCreate a free account

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.

Other Worcester Bosch Greenstar 4000 System fault codes