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Glow-worm Energy System fault F.70

Invalid product code (DSN)

Gas boiler

What it means

Device Specific Number is invalid or coding mismatch detected

Likely causes

  1. Display and PCB replaced at same time and Device Specific Number not reset
  2. Wrong or missing output coding resistor
  3. Residual live terminals L and N even when main switch is off
  4. Charged condensers

Where to start

  1. Disconnect the product from the power supply by switching off all power supplies at all poles (electrical partition with a contact gap of at least 3 mm, e.g. fuse or circuit breaker) or remove the mains plug (if present).
  2. Secure against being switched back on again.
  3. Wait at least three minutes until the condensers have discharged.

The full answer, free

  • 1 more check 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 51), 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 System. Check the model on the data plate before you order parts.

Other Glow-worm Energy System fault codes