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Room temp too high low mode

Room temperature too high in low mode

Worcester Bosch · Greenstar CDi Boilers

What does Room temp too high low mode mean?

Even when the heating system is operating in a reduced or 'low mode,' the room temperature remains higher than expected.

Common Causes

  • The building has a high degree of heat storage.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Consider activating the low mode setting earlier to allow the building to cool down gradually.

  2. 2

    Ensure no external heat sources are contributing to the high temperature during low mode.

  3. 3

    Check the control settings for low mode to ensure they are configured correctly for your home's insulation and heat retention.

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