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Hot water temperature too high

Hot water temperature too high — Hot water is too hot

Worcester Bosch · Greenstar Boilers

What does Hot water temperature too high mean?

The hot water produced by the boiler is excessively hot, potentially posing a scalding risk and consuming more energy than necessary.

Common Causes

  • Cylinder thermostat set too high

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Adjust the cylinder thermostat to a lower temperature setting.

  2. 2

    Allow time for the water in the cylinder to cool and reach the new desired temperature.

  3. 3

    If the problem persists, contact a qualified plumber or heating engineer to check the thermostat or cylinder.

Browse all codes in this manual (12)
Verified technical data. Last updated: April 2026

Related Faults

Blue light Fast flashBlue light Fast flash — Hot water not working (central heating OK)Blue light Fast flash 2 pulsesBlue light Fast flash with 2 pulses — Boiler not responding to any demandBlue light Fast flash 5 pulses, Reset button FlashingBlue light Fast flash with 5 pulses, Reset button Flashing — Ignition lockout
Source: Worcester Bosch Greenstar Boilers
Open Manual (Page 87)Search more codes in this manual