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Baxi Baxi 600/800/Assure System 2 and 600 Combi 2 platform fault H.01.05

Maximum temperature difference value between flow and return reached

Gas boiler

What it means

Insufficient circulation causing flow/return temperature difference to exceed maximum value

Likely causes

  1. Insufficient boiler/installation circulation
  2. Air in system
  3. Low installation pressure
  4. Dirty exchanger
  5. Faulty temperature sensors
  6. Poor sensor connection

Where to start

  1. Check the boiler/installation circulation
  2. Check the installation pressure
  3. Check the cleanliness of the exchanger

The full answer, free

  • 2 more checks in order
  • How to put it right, step by step
  • The manual page for this fault (page 74), right under the answer
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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 Baxi manual for the Baxi 600/800/Assure System 2 and 600 Combi 2 platform. Check the model on the data plate before you order parts.

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