I have a 6048 Central Boiler that was installed new by the dealer in 2009. It is hooked into a side arm DHW heater and then goes to an HX in the plenum of my forced air furnace. When it was first put in you could cook yourself out of the house if you wanted to by turning up the thermostat even in cold weather. Lately it seems to be struggling to just maintain the temperature in the house even with half of the house shut off. Reading back through the archives I believe I have narrowed my issue down to either the pump going bad or my HX is internally clogged up. Things that I have checked so far:
- Water level is fine in burner
- Burner cycles correctly at it's factory settings
- When I partially close the ball valve at the pump outlet, it will make a noise like water if flowing
- I pulled the HX and the air side is clear
- Furnace filter on intake side of fan is new
- DHW seems to work fine and I have good supply of hot water at approx 150° per meat thermometer