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Glow-worm Energy Combi fault F.70

Invalid product code (DSN)

Gas boiler

What it means

Invalid Device Specific Number detected

Likely causes

  1. Display and PCB replaced at same time and Device Specific Number not reset
  2. Wrong or missing output coding resistor

Where to start

  1. Check d.80 for running time in heating mode (display value x100 hours)
  2. Check d.81 for running time in DHW mode (display value x100 hours)
  3. Check d.82 for number of burner ignitions in heating mode (display value x100)

The full answer, free

  • 3 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 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.

Other Glow-worm Energy Combi fault codes