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Dunkirk Q90 boiler gas valve cycles open/closed, locks out if happens too many times in succession
in Gas Heating
I think the boiler is trying to restart when the temperature is still good, so it shuts back off within a second of the gas valve opening. How can I make it wait till it cools a bit before it attempts to re-ignite? I keep hearing the gas valve open then immediately close. Most of the time this doesn't cause a problem, but some times it cycles as described too many times and the computer locks it out, resulting in waking up to a cold house. I checked the condensation drain and it seems to be fine.
NY_Rob Member Posts: 1,370Your boiler isn't trying to start early... it's trying to start based on incoming water temp from your radiators.
You have a "flame out" or "ignition has failed" problem. The system only tries so many times then locks out any further attempts for safety reasons.0
Why do I have to turn it off, wait 20 minutes then restart? If I do that, it starts right up and runs. Nothing has changed but the temperature. How can I make it wait to try restart for 20 minutes after maybe three successive restart failures? I mean automatically.0
Sounds more like a flame-loss lockout. What model of boiler? Does it have any error codes or a flashing LED on it somewhere? That should tell you exactly why it's locking out.0
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