It is a residential but from what I understand the flame sensor functioning is similar. In my case it must have been some glitch with the flame sensor (which is integral with the spark ignitor).
Quote:
Dometic™ Atwood 35100 Hydroflame RV Furnace Igniter Electrode
The furnace electrode is both a conductor establishing an electrical spark at the Burner to ignite the air to gas mixture, and a sensor to signal the circuit board the flame is established.
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Mine would light for a few second and the gas valve would abruptly cut off. After repeating this several times on it's own it would relight and stay lit.