Short answer
Gas valve faults on commercial appliances show up as ignition lockouts, valve proving failures, false flame codes (gas passing a closed valve), unstable combustion or a 'gas valve control' code. Because a passing or stuck-open gas valve is a safety risk, the appliance should be isolated and checked by a Gas Safe engineer.
Typical codes
Examples from manufacturers' lists include Remeha E:15 (5 failed gas leakage controls), E:16 (false flame — valve possibly leaking or stuck open) and E:17 (gas valve control fault), and Andrews MAXXflo A05 (gas valve relay error). See the brand pages in this section.
Diagnosis
We check supply voltage and wiring to the valve, inlet and outlet pressures, valve proving operation and whether gas passes the valve when closed, then replace with the correct manufacturer part and recommission with combustion analysis.
Figures are typical for UK natural gas. The current edition of the relevant IGEM standard and the manufacturer's instructions always take precedence on site.
Need this done on site?
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