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Problem with Carlin 60200-02 Primary Control
I have a Carlin EZ-1 burner with a Carlin 60200-02 (Rev C) Primary Control. The control goes into a mode where the pre-purge is very long (20-30 seconds rather than the normal 8-10 seconds) and the post-purge is also much longer (> 30 seconds) and the blower cycles on and off rapidly during the post-purge. The duration between off cycles seems to be random - 1 to 10 seconds. The controller will remain in this mode until I cycle power on the unit.
I spoke to Carlin on two occasions and both times they said the issue was EMI. If so, I can't find the source. I have cleaned the contacts of the igniter and the back ends of the electrodes. There is no evidence of arcing there. I have twisted to CAD cell leads to make them more like twisted-pair. I even went so far as to put a small ( .05 uF) cap across the CAD leads to no avail. I have thus far avoided diving too far into the burner so I haven't checked the electrode gap. I don't want to make a marginal situation worse.
Any ideas? The cycling can't be good for the controller and probably isn't doing the burner motor any favors either. I am on the verge of swapping in a Honeywell controller.
Any advice would be greatly appreciated.