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Monitor MZ

Aj18 Member Posts: 1
Having intermittent problems with Monitor boiler. Unit does baseboard heat only.I have never seen unit fail even after starting boiler numerous times. Customer has to reset stat to get unit to start heating again. One time is was there and the unit was locked out. Pump and fan were running. Used monitor trouble shooting book but it said to check pressure switch first and when I did it reset boiler and it ran. Don't have a lot of experience with these boilers. Talked to a guy that sold them and he had me replace igniter. That did not work so I cleaned the head and replaced flame sensor. I have checked ground,neutral and gas pressure.Checked draft and I don't remember exactly what it was but it was ok. If anyone has suggestions I would greatly appreciate it. Thanks