TradeAssistIQHome

Vokera Pinnacle System fault E021

Gas valve control malfunction

Gas boiler

What it means

Definitive error indicating a malfunction in the gas valve control circuit.

Likely causes

  1. Combustion conditions approaching upper emission limit
  2. Ionisation sensor signal indicating abnormal combustion
  3. Combustion setup issue affecting low-fire operation
  4. Gas valve calibration fault at minimum rate
  5. Fan tacho signal fault preventing ignition sequence start
  6. Flame stability issue preventing successful ignition
  7. Repeated failed ignition attempts (3 total) leading to lockout

Where to start

  1. Check ionisation sensor condition and position in burner flame
  2. In accordance with section 7.3, set boiler to operate at minimum rate (minimum load condition)
  3. Allow sufficient time for combustion to stabilise

The full answer, free

  • 32 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 7), right under the answer
Ask about E021 freeCreate a free account

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 Pinnacle System. Check the model on the data plate before you order parts.

Other Vokera Pinnacle System fault codes