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Required temp not reached

Required temperature not reached

Worcester Bosch · Greenstar CDi Boilers

What does Required temp not reached mean?

The room or heating system is not reaching the desired temperature setting, indicating an issue with heat delivery.

Common Causes

  • Thermostatic valve(s) in the room set too low.
  • Flow temperature controller on the heating appliance set too low.
  • Air lock in the heating system.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure all thermostatic radiator valves in the room are open to a suitable setting.

  2. 2

    Increase the setting on the flow temperature controller on the heating appliance.

  3. 3

    Vent the radiators and the entire heating system to remove any trapped air.

Browse all codes in this manual (55)
Verified technical data. Last updated: April 2026

Related Faults

1A4 E1A4 E displayed — Temperature sensor in FW 100 defective1A8 E1A8 E displayed — Bus communication error with TD 200 or heating applianceA7 EA7 E displayed — General fault in the heating appliance
Source: Worcester Bosch Greenstar CDi Boilers
Open Manual (Page 68)Search more codes in this manual