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Vokera Mynute He fault AL79

Flow temperature too high, or temperature differential between primary and return too high

Gas boiler

What it means

Flow temperature too high, or temperature differential between primary and return circuits too high; a Final alarm.

Likely causes

  1. Flow temperature too high
  2. Temperature differential between primary and return too high

Where to start

  1. Reset the boiler
  2. Check appliance operation
  3. Check thermistors

The full answer, free

  • 7 more checks in order
  • The readings and component tests from the manual
  • How to put it right, step by step
  • The manual page for this fault (page 28), 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 Vokera manual for the Mynute He. Check the model on the data plate before you order parts.

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