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Rinnai E75CN Combo Boiler

143friend Member Posts: 4
This unit is about five years old, and for some reason, even though it's 7 degrees outside and in the low 50's inside (with the thermostats set to 68), the baseboard lines are cold, and the display says: 6 Burner off when room thermostat is demanding. When I reset the unit it comes back to the same thing. Any thoughts? Thx