CodeRegistry
Brands
  1. Home
  2. Worcester Bosch
  3. Greenstar CDi Boilers
  4. Temp rise instead of fall
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.

Temp rise instead of fall

Temperature rise instead of fall

Worcester Bosch · Greenstar CDi Boilers

What does Temp rise instead of fall mean?

The temperature is increasing when it should be decreasing according to the schedule or settings.

Common Causes

  • Time of day set incorrectly on the TD 200.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the time of day settings on your TD 200 control unit.

  2. 2

    Correct the time setting if it is inaccurate.

  3. 3

    Verify that the heating schedule is configured as desired.

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