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i'm thinking after the main valve opens the pressure could be dropping in the pilot tube. this could be due to a dirty, plugged and sometimes spider web inside the pilot tube. rare but does happen, nice warm home for a spider. good luck. if not let me know. could also be weak pilot coil.
On these units, the pilot ignitor and the pilot rectefier are the same part. The pilot can be lit, but not be sensed by the rectefier/ignitor. This will keep your burner tray from igniting. You need to replace the ignitor assembley. If it is the same as the raypak digital 406a I charge about $75 for that part, and it takes about 20 minutes to install. Need the part or more help e-mail me. [email protected]
It is probably something much more simple than that...Turn it on and stand back until it finally ignites, then look, using a mirror, at the burner tray from below. You will probably find a lot of the tubes, especially those near the pilot area, are not working or are burning bright orange. If that is the case, something, probably spiders, are blocking the gas from getting into the tubes. That will cause the big burst at ignition as the gas builds up for a bit before it finally reaches the pilot area.
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