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Propane issue causing boiler burner fault?
I have a 7-yr old Viessmann vitodens-200 boiler that's been running fine for the first six years then suddenly experiencing burner fault (code Eb) in multiple occasions since this winter. The installer has replaced gas valve, fan, ionization rod and ignition electrodes. Every time after the service call the boiler would run fine for 2-3 weeks before the same burner fault showed up. The installer also did a thorough check to make sure nothing was wrong with the boiler itself, he checked the gas pressure, flue system, etc. With very few options left I want to ask the propane company to set up a temporary tank next to the house and run the boiler off that to rule out it's (or not) the propane issue, I was on the phone with a propane manager and he suggested to replace the propane pressure regulator, if that fails to resolve the issue then we will set up the temporary tank.
Anything else helpful you guys can think of? Thanks!