Thank you for all the detail. It is very helpful.
We checked with a Tech at Steamist and from what you are describing it sounds like you need a new pc board and water probe. The unknown is whether you also have a control issue.
You can purchase these items by calling us at 800-707-2862.
Parts are non-returnable and need to be verified by one of our associates. Mention that Jennifer verified you already.
Here are links to the items on our web site.PC BoardWater Probe