Hello everyone,

I have a Bryant Model 350 MAV 90 Plus installed in new construction in 2006. This season, it has an intermitant problem. The thermostat will "click" on and occasionally only cold air will flow out and the unit's igntion area as observed through the inspection window is dark. When it finally does ignite (sometimes hours later), you can easily see it is lit as observed through the inspection window. Typically, prior to warming up to the set temperature, the unit un-lights (but the blower continues to blow). If I lower the thermostat below the air temperature, the thermostat clicks off and the unit and blower stop running, as you would expect. The unit is propane powered through gas lines that service the entire neighborhood with tanks located on common property about 3/4's of a mile away.

Any ideas before I call the HVAC tech? Many thanks!