My Navien CH180 ( propane ) combination water heater boiler cycles burner about 2 seconds on and 2 seconds off and repeats on / off 7 - 9 times before it locks on for a long burn cycle . I also had Error 12 - flame out a few times . Error reset by unplugging power and reconnect . Manual says check filter which was fine .I may have had some air from some new baseboard rads I just added . I think air is out now but still have short cycles every time it starts burner. System was new last year and ran fine . I do not use hot water and boiler was off for summer . I do not remember this short cycling but recent remodelling of building may be why I notice noise this year .
Is this a normal start sequence to prevent thermal shock ? I am concerned about gas pressure or other developing problems and want to know if boiler needs a service check?
Is this a normal start sequence to prevent thermal shock ? I am concerned about gas pressure or other developing problems and want to know if boiler needs a service check?
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