Quote:
Originally Posted by IvorT
When it’s not heating, the gas is switched off. When it needs to heat the water, it switches a small amount of gas through and creates a spark to ignite it. If it lights, the boiler detects this and opens the main gas valve, another clunk. If, for some reason, the gas supply is absent, the boiler senses the absence of flame, and shuts itself down. All good stuff.
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Mine appears to be somewhat different as it has a permanently lit pilot. When the thermostat detects that heat is needed, the gas valve is opened until heat level is reached. Gas is then shut off,, but pilot remains on.