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Glow-worm Energy Combi fault F.22

Safety shutdown: water deficiency in the boiler

Gas boiler

What it means

Safety shutdown triggered due to insufficient water detected in the boiler

Likely causes

  1. Insufficient water pressure in the heating installation
  2. Water loss from the heating system
  3. Air in the system preventing correct pressure reading
  4. No or insufficient water in the product
  5. Water pressure sensor defective
  6. Cable to the pump or to the water pressure sensor loose/not connected/defective

Where to start

  1. Check the displayed pressure value on the product display
  2. If the heating flow temperature is shown instead of pressure, press and hold the and buttons at the same time for longer than five seconds, or temporarily deactivate heating mode to display the pressure

The full answer, free

  • The readings and component tests from the manual
  • How to put it right, step by step
  • The manual page for this fault (page 52), 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 Glow-worm manual for the Energy Combi. Check the model on the data plate before you order parts.

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