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Glow-worm Flexicom fault F77

Condensate pump error (option)

Gas boiler

What it means

Condensate pump fault detected (optional accessory).

Likely causes

  1. Trapped condensate pump
  2. Faulty wiring
  3. Blockage in condensate pump
  4. Boiler water temperature falling below 8°C

Where to start

  1. Confirm gas and electric supplies are ON.
  2. Monitor boiler water temperature against frost protection thresholds.
  3. Check pump operates when boiler water temperature falls below 8°C.

The full answer, free

  • 26 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 37), 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 Flexicom. Check the model on the data plate before you order parts.

Other Glow-worm Flexicom fault codes