Hello. I'm having a problem with my Rheem Criterion II propane furnace.
When I woke up, my thermostat was set on Auto at 68 degrees. The temp in the house was down to 59 degrees. The main blower on the furnace was running, but there was no flame present.
The odd thing I found, was that the copper line coming into my furnace from my central air unit was covered in frost. I went outside and saw the central air unit was in fact running. I turned off the breaker for the central air unit, and turned of the power switch at the furnace. I then removed my digital thermostat from the wall, replaced the batteries, and reinstalled the thermostat.
I then cleaned my furnace filters and turned on the furnace. The main blower on the furnace comes on immediately after turning it on, and it will not attempt to ignite.
My propane tank is at 19% full. Can you help me diagnose this problem?