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Had my Ultra 155 stop working. I had a hard lockout and just hit reset without looking at it. I know.... Anyway, after the reset all that would happen was that the boiler pump would run continuously. Nothing else would. I finally got a copy of the control supplement that explained how I could access the last 6 error codes. The last error was 29, which according to the manual meant either the blower wiring was bad, the blower was bad or the control module should be replaced. So I checked the wiring, which all seemed tight, and did have 120V at the blower. So I shut it off again and plugged the harness back into the blower. Turned on the boiler and same thing, just the boiler pump running, no call for heat or DHW. So then I decide to pull the plug on the boiler, and I get a boiler status of 5 (checking air pressure switch). So I am thinking maybe it is not the module, and plug the blower back in. It goes into status 1 (pre-purge) and the fan starts up, then the boiler ignites, and then responses to a call for DHW. I put it through a few calls for DHW, both in summer and winter modes, and it seems to be working. I have not tried it in a call for heat.
Anyone have any idea why this might have happened? It just seems like the fix was unplugging and plugging back in at the blower 120V connection while the boiler was powered.