I have an older Goodman outdoor package unit. The heat side is propane. At the beginning of the heating season [October], when I turned the heat on, the exhaust fan for the unit ran but the burner did not ignite. After turning off the heat at the thermostat and then turning back on after the exhaust fan stopped running, the heater turned on and everything returned to normal. A friend of mine suggested that this can happen in the beginning of the season due to some air trapped in the system. [We have piped in underground propane service] That sounded good at the time especially since everything seemed to be running fine..........until today. The same thing happened this morning. The thermostat called for heat and the exhaust fan kicked on but the burner did not ignite. Again when I shut down the furnace from the thermostat, waited for the exhaust fan to stop and restarted, everything is again working fine.
Obviously this sequence of events does not give me a lot of confidence if we leave the home for any amount of time. My first thoughts are usuually an igniter [which was replaced about 2 years ago] but the fact the furnace then works after restarting has me perplexed. If I call a HVAC tech out now he will be seeing a unit that works fine. Would appreciate some thoughts on this problem before I commit to a tech.