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Lochinvar Boiler Won't Light
Seeing in anyone can help me out. I have a Lochinvar Noble Combi unit. Installed it about two years ago and it has worked great for both the heated floor and domestic hot water.
About a month ago, it started locking out with a 'Flame Fail: Ignition'. It would do it intermittently (about once a week), I would hit the reset and then it would fire off and be fine. However, not it will not fire. I hit the reset and it just cycles and locks out ever time.
I checked the ignitor and have spark (cleaned it anyways). Moved on to the gas valve and pressure switch, replaced each of them and still the same thing.
Thru some troubleshooting, I was able to get it running. If I remove disconnect the hose that connects the pressure switch, intake pipe and gas valve, blow a little pressure (and hold it) to the gas valve, it will fire off and run like it should until I release the pressure.
First I will admit I cannot figure this out as I would figure based on the routing of this hose that it would be a negative pressure, not a positive pressure, I checked the intake pipe to make sure that no nest is within the pipe (have bird screens installed on the outside regardless). Pipe is clear. Same with on the exhaust line. Unit is mounted right next to an exterior wall, so run is short (less than 4').
For the life of me, I cannot figure this out. Any suggestions or comments are greatly appreciated!
For reference, my unit is a NKC199, Series 110.
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