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Buderus GB142-30 Soft 6A (sub 227) only when cold.
Similar to my post of July 2017, I have noticed that (when cold) my GB142 tries to light 3 times (soft 6A each time) before finally catching and working fine. It rarely makes it to a 4th time and a HARD/lockout 6A.
This happens ONLY after the boiler has cooled to ambient temperature. Like overnight when not in use, or during warmer months when there is no call for heat ot DHW for along periods of time. If the boiler does not have time to COMPLETELY cool down, it will start the FIRST TIME on the next call for DHW or heat. No 6A. The 3 tries thing only happens after it cools completely.
Even though I am in the northeast, it doesn't get the same use as most in this region as I supplement with wood heat.
It has had fairly regular maintenance. About 18 months ago I did the following: replaced the HSI and ionization rod, cleaned the heat exchanger and checked gas pressure and ratio. The gas inlet pressure was 10.10 in h20. The gas/air ratio was at the very positive limit of spec -.04 to 0.00.
I have a spare UBA3 to test with and that didn't make a difference. (I didn't think it would. It was a "I have it, why not try it" type of thing)