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I have a GV-90+4 boiler that acts funny: When there is no demand for heat for a long time (e.g. a few hrs) and thus the temperature of the water inside it drops below 120F, on the next heat demand, it would start a normal cycle: blow the air out from the burning chamber, start the igniter, start the gas, but there will be no flame. The flame led flashes for a few seconds, then the gas goes off, the blower continues to blow for half a minute, then it stops for a second and the cycle restarts, this time always successfully. This is not random. It is like clockwork. During a long heat demand, the gas is stopped, the chamber is ventilated, then when the water temperature drops to 160F, the cycle restarts with no problem. There is always flame on the first try.
I had this symptom last year for almost an entire year. It did not get better or worse. At some point I got tired of it, I replaced the burner cone and the igniter (the cone was rusted allover and blackened towards the igniter and the igniter was blackened as well). After replacement, things worked well for a few months, but now the problem is back. My theory is that the igniter does not have enough time to reach the required temperature to ignite the gas, so when it is perfectly clean it works, but as soon as it gets a bit dirty it can only reach the proper temperature if it starts off moderately hot. Any ideas? There are only 2 controls on my board: economy adjust (which I turned to max) and boiler temp (which is at 2 thirds or so). I have no idea what they really do. Can these help with the time the igniter is heated?