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It sounds like your aquastat is acting up. Can you locate the device on your boiler? it's most likely a Honeywell control mounted in the DHW coil plate. Try turning up the temp on the aquastat and see if the burner responds
I wanted you to turn it up to see if the burner responds to the aquastat. If it doesn't respond then replace the aquastat after you check the wiring connections and find them to be in good shape. It's possible the aquastat is out of calibration or has failed altogether.
Of course if the boiler is hot already the burner may not come on so it's best to wait until the boiler cools down a bit.
Very unusual for an aquastat to fail this soon but it does happen. It's important to check the wiring since 18 gauge wiring is notorious for (partially) breaking unnoticed. This can lead to intermittent operation or worse.