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Thanks for your suggestion.
I opened and cleaned the burner chamber and it looked good. All of the fittings are tight. Replaced the air valve on the DHW tank, the tank's thermostat too.
What...

The boiler is now wired so that the heating circulator pump runs whenever the boiler is in winter mode. It was wired so that the circulator only ran when the thermostat was unhappy. Now the short...

BadgerBBoilerMN,

Thanks for the good news. How old is the oldest MZ that you saw?

The new thermostat and air vent are installed. Two liters of treated water were also added. The boiler is doing the exact same thing.

What is the same thing, you ask?

First, the thermostat...

Well, the air vent and thermostat were ordered today. I also ordered the realllllly expensive water treatment. Apparently, if you don't use the manufacturer's chemicals, you have no warranty on the...

The pump is on the wrong side of the expansion tank. The air vent should be on top of the expansion tank. There is most likely other things wrong that may be dangerous that don't show here.

14476The front of the thermostat is covered by a white plate that is part of the boiler housing. There are two screws holding the unit to the plate. Between them there is a dial with Degrees C from...

After many years of excellent service the boiler started short cycling. The DHW is still hot and the house warm. But, the boiler is starting every thirty or so seconds and running for only part of...