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Posted by Cameron Greener on September 14, 2008 at 23:16:26:
This boiler seems to operate correctly until it reaches its high control setting and the burner shuts down. It continues on to post-burn purge (the burner fan continues to blow without a fuel mixture), but as soon as the cycle completes, the control module clicks and the purge fan comes back on, off, on, etc. The burner doesn't come back on unless the low limit tells it to, or the operating control tells it to via the house thermostat.
Prior to this I had problems with the low limit not shutting the burner down even near the high limit. I have replaced both the operating control (the small metal piece not the computer) and the low limit module and that problem went away. Now, it just won't get off the post-purge cycle and go into standby mode. Any thoughts? Its a natural gas unit too.
Thanks.