JDL
New Member
I recently installed a Burnham LP fired Alpine 150 BTU boiler that is servicing three hydronic coils and a indirect hot water heater. I am using a Taco pumps and a controller for the zones. The system works great but on a few occasions in the last few weeks, since the system has been running, I have notice something that I don't understand. When the boiler receives a heat call from either the Taco zone controller or from the indirect hot water heater it sequences from standby, to drive purge, to pre purge, to drive light off, to pre-ignition test, to pre ignition, to direct ignition then running until the set point is achieved and/or the call is satisfied after which it goes to post purge and then back to standby. A few times it has gone from pre ignition right to post purge with out ever starting and then it sequences though the entire process again and again without ever firing. In each case I just turned the power supply off and on again and the boiler then goes through the normal process and fires right off. The unit has almost a 100 hours on it already and this has only happened twice that I have noticed so what ever is going on here is rare. When this happens it does not record a fault code in the history on the system. I have read in the manual that it can cycle up to 5 times before firing. Any thoughts on what might be going on here?