I am still obsessing about the boiler shut down. And now, after I have explained the heating system setup, I can share the development of my pump paranoia without making it too abstract.
The error message (“174 Lockout safety relay feedback incorrect”) on our Trinity LX 150 indicated that something in the pre-ignition testing went wrong.
I cleaned the flame sensor rod and electrical spark ignition – both standard maintenance items. But neither of them showed much oxidation and both were pretty clean to begin with. The condensate drain, which could also be part of the problem, was clean and free flowing.
In search for a rational explanation, my mind wandered over to the pumps. As shown in the previous post I have three pumps:
- The domestic hot water pump
- The boiler pump
- The main pump (system pump) for the hydronic heating system
In addition to that I have three pumps, each feeding one of the heating zones:
- The basement
- The first floor
- The second floor
I was under the impression that the main pump (system pump) for the hydronic heating wasn’t running and as such may have contributed to the boiler lockout.
Maybe I had been playing a little too much with the touch screen on the boiler, which showed the status of the three main pumps. But whenever the boiler was running, the pump status on the touch screen didn’t correspond to which pump was actually active.
With a little more research, I discovered that I can run a diagnostic test on the pumps.
Only one out of three pumps passed the test! Time for panic?
Well, it turned out I was barking up the wrong tree – and that I have an installer, Mariusz, that puts up with my nerdiness.